CSEC Mathematics MCQ Live part 2

Added: 2026-05-17

[00:00:37]All right, so we're live. We're live.

[00:00:39]Y'all hear me on YouTube?

[00:00:41]>> [laughter] >> It's Friday night.

[00:00:58]We're live. We're live. Y'all hear me?

[00:01:05]So we're live on YouTube and TikTok.

[00:01:13]All right, I see one of my students is here.

[00:01:15]What's up? What's up?

[00:01:17]All right, so we're live. You know we normally do it multiple choice questions as I promised in the previous videos.

[00:01:22]We're doing some You're going to choose some popular multiple choice CSEC mathematics questions.

[00:01:28]How was the [gasps] week?

[00:01:29]>> [laughter] >> How are your exams going so far?

[00:01:35]All right, so let's go. Let's roll.

[00:01:40]YouTube, y'all hear me loud and clear?

[00:01:41]TikTok, y'all hear me loud and clear?

[00:01:52]>> [snorts] >> All right.

[00:02:03]TikTok, y'all hear me loud and clear?

[00:02:16]All right, so let's go.

[00:02:26]All right, let's work.

[00:02:28]So, the question says, "At the end of at the end of the year, um this one, at the end of the year, a car is worth 5% less than it was worth at the beginning of the year.

[00:02:39]If the car was worth 9,500 in December 2016, then its value in January 2016 was" So, you want to know what was the original You want to know what was the original cost of the car.

[00:02:54]So, to get the original cost of the car, we saw that 5% came off.

[00:02:59]So, this price that you're seeing here is 95%.

[00:03:03]So, to find the original cost, we can say 100 over 95 times this cost, which would be 9,500.

[00:03:12]So, 95 was 95, 95 into this 95 is one, so 100 times 100 is simply give us $10,000, which is simply B.

[00:03:28]So, now that you comment, drop your answer, I'll drop your answer. We're looking at this one now.

[00:03:38]So, the the cash price Oops.

[00:03:43]Yeah. So, the cash price of a television set is 300 350.

[00:03:48]When bought on hire purchase, a deposit is a deposit of $35 is required followed by 12 monthly installments of $30. How much money is saved by paying cash?

[00:04:02]So, you want to find how much money is saved by paying cash. So, so you know for higher purchase for higher purchase, you basically you pay down some money and then you pay some monthly installments.

[00:04:16]All right?

[00:04:17]So, they want to know how much money is saved by paying cash. I think we did this one earlier, so we'll go through this one quick.

[00:04:23]So, 12 monthly installments of $30, so this should be 30 * 12.

[00:04:28]This zero will go here. 1 * 0 is 0. 1 * 3 is 3. 2 * 0 is 0. 2 * 3 is 6.

[00:04:35]So, you add up this, you get $360.

[00:04:38]And this the deposit has to be added to this.

[00:04:41]This will be plus $35.

[00:04:44]This will give us $395 is what I paid for higher purchase.

[00:04:52]So, if 395 is paid for higher purchase and 350 is paid for cash so 395 - 350 will give us this five five from nine will give us four. So, $45, which is D.

[00:05:13]All right, so we're now on TikTok. Share the live. Tell a neighbor, tell a friend. It's Friday night and we're working maths again.

[00:05:25]Okay.

[00:05:30]So, that's why um The simple interest on $800 for 3 years is 54. What is the rate?

[00:05:40]What is the rate of interest per annum?

[00:05:42]So, we're dealing with simple interest.

[00:05:44]So, we know know formula for simple interest is PRT divided by 100.

[00:05:51]So, they told us the simple interest is 54.

[00:05:54]So, this would be 54 is equal to P which is the money invested.

[00:06:01]So, $800 P so 800 multiplied by the rate and that's what we want to find multiplied by the time which is three.

[00:06:08]all over 100 So, we can do some simple We can do some simplification. These two zeros will cancel with these zeros since everything at the top is multiplying, we can easily cancel out to the bottom.

[00:06:19]And 8 * 3 would give us 24.

[00:06:23]I think 8 * 3 is 24. Yeah, 24.

[00:06:26]So, 24 * R would give us 24R and this is equal to 54.

[00:06:31]So, the rate would be equal to 54 divided by 24.

[00:06:36]And already can see this is not the answer.

[00:06:39]This is not the answer. It says either.

[00:06:42]Most likely 2 and 1/4 would be the answer which is um not right. Most likely.

[00:06:52]Somebody is saying C now one.

[00:06:56]Anyways, so 54 um two can go into 54 5 24 can go into 54 two times.

[00:07:06]24 24 48. That would give us a remainder of 48.

[00:07:11]Let me see 54 minus 48.

[00:07:15]Um this will give us six. So, 6 over 24. So, 6 1 6 6 into 24 4. So, 2 and 1/4 which is B.

[00:07:26]All right. You got me. You could have You could have already common sense would tell you that common sense would tell you that B is the answer because we know it definitely could not have been A either.

[00:07:41]So, let's go for those of you on TikTok.

[00:07:42]I'm on YouTube as well. I'm live on YouTube. If you want, you can hop over there.

[00:07:48]If the simple interest on $800 for 3 years is $60, what is the rate of interest per annum?

[00:07:56]So this is the same question that we had to do up here.

[00:07:58]Actually, no. This one asks us for $60.

[00:08:01]So let me go through this quickly. So SI is equal to PRT over 100.

[00:08:06]So in this case, the simple interest is $60.

[00:08:10]So 60 is equal to the principal, which is 800 multiplied by R, that is what we want to find again, times three, all over 100.

[00:08:24]So these two zeros will cancel out here.

[00:08:25]So 8 * 3 again will give us 24R.

[00:08:29]And that is equal to 60.

[00:08:32]So R would be equal to 60 / 24.

[00:08:36]I definitely This looks like 2.5 as the answer. So 24 into 60 24 into 60 is Let me see. Two can go into 24 can go into 60 two times.

[00:08:54]So let me see. 60 - 48 This would give us 12 remainder. So 12 over 24, which would simply be a half. So this is 2.5, which is B.

[00:09:23]So I'm working all of the So I'm working I'm working. Yeah, as you can see, I'm working all the different kind of questions that can come like this, right?

[00:09:31]So if you see any question like this, you'll know what to do.

[00:09:38]It's not a paper, it's not a full paper, it's just a combination of these different topics that normally come.

[00:09:44]So, if simple interest on 9 So, here's the thing. Um so, everybody was complaining about the mock exam not the mock exam, the actual exam, right? So, by now you should be beating the paper ones, especially if you want to pass pass. If you are serious about passing maths, you should be beating the paper ones now, right?

[00:10:00]You should be beating the paper ones.

[00:10:03]So, if the simple interest on 900 for 3 years was 108, what is the rate of interest? Again, so SI is equal to P RT over 100.

[00:10:15]So, the simple interest in this case is 108.

[00:10:23]So, 108 is equal to P.

[00:10:30]P is 900, so 900 * the rate * 3 all over 100.

[00:10:35]So, these two zeros will go with this here again. So, 9 * 3 will give us 9 threes towards six.

[00:10:42]9 threes towards six, 9 threes towards six, 9 and 9 No, 9 threes 27. Woo.

[00:10:48]9 and 9 18, yeah, 27 R is equal to 108.

[00:10:52]So, R will be equal to 108 / 27.

[00:10:58]So, I I This looks as though Let me see by 27 * 2 is 54, 54 * 2 will give me 108. So, this answer here should be B.

[00:11:14]All right, cuz 108 / 27 will give me 4.

[00:11:18]So, R is equal to 4.

[00:11:25]All right.

[00:11:34]So, the simple interest on a loan of 6,000 for 3 years was 900. What is the rate? So as you can see these are the different ways in which they can bring rate. But I either way that they bring it, it's the same thing that you have to do.

[00:11:45]So regardless of how they bring it, you know, the the the approach will be the same.

[00:11:54]However you work it that is that is okay as long as it makes mathematical sense.

[00:11:59]So SI is equal to P RT over 100 again. So the simple interest in this case was 900.

[00:12:08]So 900 is equal to the principal which is the money invested. So 6,000 multiplied by R which is what you want to find times time which is three again all over 100.

[00:12:20]These two zeros will cancel out here.

[00:12:22]6 threes 18. So 18R is equal to 900.

[00:12:29]So 900 divided by 18 would be equal to R.

[00:12:33]So once again, I definitely know this is not the answer. This is not the answer.

[00:12:36]This is not the answer. I can see D is the answer. Common sense will tell me D is the answer cuz 18 can go into 900 900 way more than all these times.

[00:12:45]So 18%.

[00:13:01]Oh, my bad.

[00:13:03]So this should be 6,000 and not 600, right? Oh, my.

[00:13:09]What did I do? Let me see. So So let me check. Let me do this back. So 6,000 and not 600.

[00:13:16]So this should be 6,000 multiplied by the rate multiplied by three all over 100.

[00:13:27]So these two zeros would go here.

[00:13:31]Um 60 * 3 would give me 180 R, and that is equal to 900.

[00:13:37]All right, so 900 / 180 is equal to R. So, these two zeros would go.

[00:13:49]And 18 can go into 90 how many times by? Can't be two, can't be three. Most likely is is C is the answer.

[00:13:58]All right.

[00:13:59]So, 18 can go into this nine time five times.

[00:14:04]18 * 5, let me see.

[00:14:07]8 * 5 = 40.

[00:14:10]5 * 1 = 5, yeah, 90. So, it can go into that five times.

[00:14:16]So, here's the thing, folks.

[00:14:18]With a name like that, I'm definitely not coming to your school. The person that asks that, right?

[00:14:23]With a name like that, no, at all.

[00:14:25]Error. Right?

[00:14:27]With a name like that, no.

[00:14:31]The person that asked that that asked that question, no.

[00:14:34]>> [laughter] >> Anyways, So, in paper one for mathematics, no calculator. It's just your brain and, you know, it's just your brain you're working with, right? No calculator.

[00:14:55]So, let's go. Um A loan of 8,000 was repaid in 24 equal monthly installments of $400. The rate of interest on the loan was So, let me see. 24 monthly insta- equal monthly installments was 400. So, at the end of 24 months, they will pay So, 400 multiplied by 24.

[00:15:34]Um as you hear, 2 * 0 is 0, 2 * 0 is 0, 2 * 4 is 8.

[00:15:39]4 * 0 is 0, 4 * 0 is 0, 4 * 4 is 16.

[00:15:45]So, when I add this now, I'll get 9,600.

[00:15:49]So, this is the money paid back after 24 months.

[00:16:09]TikTok, can y'all hear me? I'm seeing something pop up on the screen. I just let me know if y'all hear me on TikTok and on YouTube as well.

[00:16:18]I just let me know.

[00:16:22]If you hear me on TikTok, let me know.

[00:16:30]Uh I'll take that as a no.

[00:16:34]Hear me on TikTok, folks? Let me know.

[00:16:47]Oh.

[00:16:56]Uh I guess TikTok has the issue.

[00:17:06]Anyway, so we're on YouTube still. So, I'll work with the YouTube.

[00:17:11]So, 9,600 is the 9,600 the extra money. So, to find the rate So, 9,600 is actually full money, not the extra money. So, the extra money that was repaid would be 9,600 minus 8,000.

[00:17:33]This would give us 1,600. So, this is the extra money that was paid back. So, they want the rate of the interest on the loan. So, the rate would be um 1 1,600 over 8,000 multiplied by um 100.

[00:17:54]This zero go with that zero. This zero go with that zero. This zero go here. 8 1s 8. 8 into 16 2. So, this here would be 20 percent, which is D.

[00:18:07]All right, let me end this live on on um Let me end this live on TikTok and restart it.

[00:18:31]Hey, YouTube. Let me one second. Let me just end this live on TikTok and restart it.

[00:18:43]If they If they change up the paper, that's how to use your brain.

[00:18:48]Even if they change it up the questions, we'll still, you know, they will still the same approach and so on. You just got to apply yourself.

[00:19:18]>> All right.

[00:19:21]So, I guess it's TikTok as Instagram.

[00:19:23]Trying to end the live.

[00:19:28]I'll be answering this on by the time.

[00:19:31]YouTube.

[00:20:38]All right. So, while that loads on TikTok Let me go. So, the simple interest The simple interest on 600 for 4 years at 5% per annum is So, we know simple interest is equal to P P R T over 100.

[00:21:03]Anyways, so the simple interest would be So, the P is 600.

[00:21:15]So, live still taking sticking on Tik Tok.

[00:21:19]Wow.

[00:21:37]Tik Tok, the live still takes sticking.

[00:21:39]Anyway, so 600 * the rate, which is 5 * the years, which which will be 4 over 100. So, which one got that? 600 * 5 * 4, so A has that.

[00:21:53]You are already A.

[00:21:56]So, y'all hear me loud and clear, Tik Tok?

[00:22:06]I think that has a note cuz it's Oh, okay.

[00:22:12]Okay.

[00:22:13]So, let's roll.

[00:22:26]So, if 7,000 is borrowed at a rate of 5% per annum for 3 years, then the simple interest is So, simple interest is equal to PRT over 100. So, the simple interest would be P.

[00:22:43]It said 7,000 is borrowed, so it's 7,000 * R.

[00:22:54]Um so, the R would be 5 * 3 over 100.

[00:23:00]Not 1,000, 100.

[00:23:02]So, these two zeros would go here.

[00:23:04]Um 7 * 5 Maybe you don't have a calculator.

[00:23:08]It's just your brain, right? It's just your brain that you're working with.

[00:23:51]So, 7 * 7 * 7 * 7 * 7 * 2 is 4. 7 * 5 is 35, I think.

[00:23:57]Um 35 * 5 35 * 3 This will give me 3 * 5 = 15.

[00:24:18]3 * 3 is 9. 9 and 1 10.

[00:24:29]What am I doing?

[00:24:33]So, this is 350 * 3. So, 3 * 0 is that. 3 * 5 is 15. So, 5 here.

[00:24:40]3 * 3 is 9. 9 and 1 10. So, 1,050, which is D.

[00:24:59]All right. right, trying to end this live on TikTok. Let me end the natural way now on TikTok.

[00:25:11]So, next one uh dress cost $180 is being sold at a discount of 10%. The amount of discount is So, these questions you want to run through. These are These are beautiful and easy questions. So, 10% discount, they want to know how much is the discount.

[00:25:25]So, this is 10 over 100 * 180.

[00:25:30]This zero go with that zero. This zero go with that zero. So, obviously, the discount will be 1 * 18, which is 18.

[00:25:36]So, the discount here would be C.

[00:25:50]I think we did this one just now.

[00:25:51]Actually, no, we didn't.

[00:25:55]So, the simple interest on $600 for T years at 5% per annum is 120. The value of T is So, the value of T So, T T is in T is T years, right? So, you can put the same simple interest formula. Simple interest is equal to PRT over 100.

[00:26:20]So, the simple interest is 120. So, 120 is equal to the principal, which is the money invested.

[00:26:28]So, then this case, the money invested is 600.

[00:26:31]So, this will be 600 * the rate, which is 5% * the time, which is T over 100. So, they want the value of T.

[00:26:48]So, to get the value of T, we You to take over this 100. We're not solving this here in this case. So this will be 120 * 100.

[00:26:56]Um or we can carry over this one time.

[00:26:58]This will divide all divided by 600 * 5 is equal to T.

[00:27:04]So 120 * 2 you got 100 * 120 which is the same thing. All divided by 60 * that. So that answer there is A.

[00:27:33]I'm really trying to end this live on Tik Tok.

[00:27:36]It's sticking.

[00:28:18]So Mrs. Ruin has US $200 to change to TT.

[00:28:24]The bank gives her TT 6.2 dollars for every one US and charges 2.50 TT dollars for the transaction.

[00:28:37]So she got 200 US and she want to change it to TT. So to convert this to TT we need to uh multiply by the exchange rate which is 6.20.

[00:28:49]So, we can say 200 multiplied by um 6.20. So, we can just jump this here to the end.

[00:28:58]Um so, we can say multiplied by 620.

[00:29:01]We can do 62. It doesn't matter.

[00:29:03]So, 0 0. So, 6 * 0 is 0.

[00:29:07]6 * 0 is 0. 6 * 2 is 12.

[00:29:11]And then, you put the zero for the zero.

[00:29:13]So, 2 * 0 is 0. 2 * 0 is 0. 2 * 2 is 4.

[00:29:17]And then, you multiply everything by six now.

[00:29:20]So, 6 * 0 is 0. 6 * 0 is 0. 6 * 2 is 12.

[00:29:24]And then, we add up everything.

[00:29:26]So, all zeros, all zeros. And there's two here. Four and one, five.

[00:29:31]Bring down the two. Bring down the one.

[00:29:33]And then, remember we jump out the point two times, so we got to bring it back in two times as well. So, this is how much money she would receive after she done exchange. But remember, she's charged $2.50 for the transaction.

[00:29:47]So, we got to minus $2.50 from this.

[00:29:55]So, minus $2.50.

[00:29:57]So, we can add in a point zero zero here.

[00:30:00]Um zero there. So, we can borrow one there. This becomes 10, so this will be five.

[00:30:06]You can borrow this, it becomes four and one.

[00:30:09]So, 11 minus two would be nine. Bring down the four.

[00:30:14]Eh, like I do something wrong.

[00:30:16]Like I multiply wrong.

[00:30:24]Well, let me see. Let me see the maths.

[00:30:26]And this is the thing with these people one questions, right?

[00:30:29]Um let me see something.

[00:30:39]All right. So, I do something wrong. I I something wrong. So, let me see.

[00:30:45]0 0 2 * 0 0 2 * 0 0 6 * 0 0 6 * 2 is 12. Okay.

[00:30:57]2 * So, you bring down a 0. 2 * 0 0 2 * 0 0 2 * 2 is 4.

[00:31:03]All right.

[00:31:07]I I I why did I notice this is absolutely wrong? What what did I do there? So, we add these two together.

[00:31:14]0 0 4 2 1 So, you're bringing back the point now. We get $124.00.

[00:31:22]I have no idea what I did just now.

[00:31:23]>> [laughter] >> I don't know why I did that what I did just now. That was crazy. And easy thing about these multiple choice.

[00:31:29]That is why I always tell students multiple choice there I I would say it's they're harder than um structured question. I did multiple choices either right or wrong. One simple mistake and all your marks gone.

[00:31:42]So, you got to minus 2.50 from this. So, this is easy. So, we know this will just give us um 37 37.50. So, the answer here is E.

[00:31:52]So, you got to be careful, right? These things absolutely easy stuff, but it causes you to be causes you to concentrate not to make simple mistakes like what I did just now. Absolutely easy simple mistake I made.

[00:32:11]So, you need to be careful with questions, eh?

[00:32:15]Need to be very very careful.

[00:32:21]Guys, it's true that we have to do back paper two Garnish. Don't make me block block you by talking nonsense. You don't you don't have to do back any um paper two. There's no absolutely no reason for you to do back paper two.

[00:32:35]I would advise you and the students out there, focus on the the the future. The paper two is gone.

[00:32:44]All right, the paper two is gone. No no no thinking about the past. There's nothing happened to the paper. The paper wasn't leaked. There wasn't any issue.

[00:32:55]Anyway, so XCD Anyways, so XCD $6 is equivalent to US $1. And XCD $15 would be So, this will be 15 divided by six, eh?

[00:33:35]Divided by six, however you want to do it. Um So, six can go into 15 two times.

[00:33:45]So, we already see the answer is C. You don't need to go any further.

[00:33:49]Cuz definitely not this, definitely not this, definitely not this. So, there's this thing. More multiple choices as well. You don't need to go further.

[00:34:03]Next one.

[00:34:04]The exchange rate for one United States dollars is $2 and and $0.70 EC EC currency. What is the value of US 4.5 in EC currency?

[00:34:19]So, we got US 4.50.

[00:34:22]I want to convert it to EC. So, we see the exchange rate is 2.

[00:34:26]um [snorts] 70.

[00:34:28]So, we got to multiply this by 2.70.

[00:34:31]Maybe I have You don't have any calculator.

[00:34:34]So you got to multiply so you can move this zero move these zeros to the end.

[00:34:38]So we jump out two times for both.

[00:34:42]So this will be 450 multiplied by 270.

[00:34:47]And this is this is the kind of multiplication you have you have to be doing. So put a zero there, put a zero.

[00:34:53]Two times zero is zero. Two times five is 10.

[00:34:57]Um two times four is eight eight and one nine.

[00:35:01]So you put another zero in place of this zero.

[00:35:04]Seven times zero is zero. Seven fives 35.

[00:35:09]I think. Seven fives 35. Let me see.

[00:35:11]Five fives 25. Yeah, 35.

[00:35:14]Seven fours 28. 28 and three 28 and three would be 31. So you putting the whole 31 there.

[00:35:23]And then we add those two together.

[00:35:25]Zero go here. Zero one three nine.

[00:35:33]All right. What am I supposed to do here, man?

[00:35:51]Let me check back this here.

[00:35:52]Look zero zero. Two times zero is zero. Two fives 10.

[00:36:02]Eight zero here.

[00:36:07]Seven times zero is zero. Seven fives All right.

[00:36:14]So zero here. Seven times zero is zero.

[00:36:16]Seven fives 35.

[00:36:19]Um bring any five there.

[00:36:22]Seven fours 28.

[00:36:24]28 and three 31. All right. So once again, simple mistake again.

[00:36:29]Simple mistake again. So, 0 0 5 1.

[00:36:34]Um this here give you 12. So, we jump out four times. So, we got to jump in back four times. 1 2 3 4. So, the answer is 12.15, which is D.

[00:36:51]The only thing that wrong with table two is that we did a lot of super mistake.

[00:36:56]>> [laughter] >> All right, you said it, not me, right?

[00:36:58]Um Was it Mariah?

[00:37:03]You said it.

[00:37:05]All right. So, how we looking? How we looking so far? We got to be grilling these people once it. We got to be grilling them. So, you see how I I I could easily make mistakes with these things here.

[00:37:15]That is why you got to you got to keep drilling them and practicing them. All right?

[00:37:21]Don't take them for granted at all.

[00:37:23]Students take these things for granted and think [clears throat] that oh gosh, this people once it's easy marks. What?

[00:37:29]People want to say right or wrong.

[00:38:00]All right. So, we done with that. Look at some algebra now.

[00:38:04]I I don't know about I I genuinely dislike those kinds of questions that we did just now because of the amount of calculation, right?

[00:38:11]Genuinely dis- dislike them.

[00:38:14]All right? Lot of calculation.

[00:38:20]Somebody say we kill a pig."

[00:38:29]All right, so we're back live on TikTok.

[00:38:31]I think I sorted the issue.

[00:38:53]All right, so I'm back on I'm I'm going back live on TikTok. I think the issue was sorted.

[00:39:01]All right, so let's go. So, 1 over 5x + 2 over 3x is equal to So, 1 over 5x + 2 over 3x I 3x So, Yeah, I already know this is not the answer. I already know this is not the answer. Thing is I already know this is not the answer. This this should be the answer. That's by looking at it, right?

[00:39:24]But, let's work it out though. So, we got to find the LCM of 3x and 5x.

[00:39:28]So, you find the LCM of 5 and 3. So, the LCM of 5 and 3 is 15.

[00:39:33]And then, we find the LCM of x and x.

[00:39:36]LCM of x and x is simply x.

[00:39:39]So, 5x / 15x will give me three. So, I multiply that answer by the top there. 1 * 3 is 3. 3x / 15x is 5. So, I multiply that answer to the top here. Since we plus, 2 * 5 is 10. So, total 3 and 10 would be 13 over 15x, which is simply D.

[00:40:08]All right, simply D as the answer.

[00:40:19]And there we got our next one here which is very similar.

[00:40:22]4 over 5x plus 2 over 5x.

[00:40:27]So in this case you see we have 5x and 5x as the denominator. So the denominators are are the same.

[00:40:33]So all we do we put back the denominator which is 5x and we add the numbers at the top. So 4 and 2 would give us 6.

[00:40:41]So this answer here is 6 over 5x which is simply A.

[00:40:44]>> [clears throat] >> So when the denominators are the same you see how CXC wicked?

[00:40:50]All enough students would go and add 5x and 5x and then they would put 10x and then they add the top and they get 6 over 10x and the marks gone for channel.

[00:41:00]So the answer is E.

[00:41:06]So take that. Y'all hear me now loud and clear?

[00:41:09]Fix the issue. Let me know if y'all hear me loud and clear and you're seeing everything.

[00:41:21]All right. So yes, as you call me straight live we back. We had some issues just now.

[00:41:26]Um you too I will open up this one.

[00:41:28]Given that three star six is equal to 12 and two star five is is equal to nine then A star B may be defined as um Okay, good. So for this one here you you want to see which one of these here will define these relationships that I have at the top here.

[00:41:49]So I um I would say simply do trial and error and I think the answer is the last one. So let me try it. Let me try the last one. I think it's either the last one or C.

[00:41:57]So 2a plus b. So let's try that one.

[00:42:02]So three star six should give me 12. So let me see if um 2a plus b if I work with that I get 12.

[00:42:11]So this is A, so this will be 2 * 3 plus 6.

[00:42:16]So, 2 * 3 = 6.

[00:42:18]6 + 6 is 12, so that works out.

[00:42:23]So, let me see if 2 * 5 will give me 9.

[00:42:28]So, this will be 2 * 2 * 2 plus um B, which is 5.

[00:42:37]So, 2 * 2 = 4, 4 and 5 would give me 9, so indeed that checks out and that checks out, so the relationship is 2A + B, which is simply D.

[00:42:49]Right? D is the answer there.

[00:42:52]All right, so YouTube, I like how we looking on YouTube, man.

[00:42:55]Look at yourself, Denish and Francis and Zidane and Mariah and Trip.

[00:43:06]All right. So, let's look at this one.

[00:43:08]John has X marbles.

[00:43:10]Mark has twice as many marbles as John.

[00:43:13]Mark gives John five of his marbles. How many marbles does John now have?

[00:43:20]So, we see John got X marbles, so John got X.

[00:43:24]And Mark has twice as many, but we really we don't really care about Mark's marble.

[00:43:29]So, Mark gives John five of his marbles. So, John had X marbles first and he got five more.

[00:43:36]So, we add five to the ones he had.

[00:43:38]So, how many mar- marbles does John now have? X + 5, which is simply B.

[00:43:49]All right.

[00:43:53]Well done, Miss Marco.

[00:44:04]Why are Why Why everybody saying C C?

[00:44:10]C, John has X.

[00:44:14]How many marbles does John now have?

[00:44:15]Yeah, my X plus five. Why why why ask it? What's the worries? Yeah, careful careful.

[00:44:21]Careful, right? Careful, YouTube.

[00:44:36]Yeah, they say C. Why not C?

[00:44:39]So, John has X marbles.

[00:44:43]Mark has twice as many marbles as John.

[00:44:47]So, John start off with X marbles.

[00:44:50]Mark has twice as many marbles. We really care about Mark's marbles.

[00:44:54]So, Mark gives John five of his marbles.

[00:44:57]So, John start off with X and now he get five marbles.

[00:45:01]So, many marbles does John now have?

[00:45:03]John has X John has X plus five marbles, right?

[00:45:08]X plus five come on folks. Yeah, careful careful. You can't say it. We can't say in paper one we trust and and you know you giving away easy marks like this, right?

[00:45:18]You can't say paper one we trust.

[00:45:21]So, I'm assuming persons try to memorize this here but you got you got to read the questions carefully, right?

[00:45:27]If you want to memorize the answers is you got to memorize I would say memorize how to work the question not really the answers.

[00:45:35]Anyways, so So, I think there's a similar question to this. That is why so paper one we trust but we still got to read the questions, right?

[00:45:47]You don't want to come out and say oh the questions repeat and then they had a slight change and you know you end up like that.

[00:45:52]So, nevertheless um I said they read Mark instead of John.

[00:45:56]Okay. Okay.

[00:45:58]So, if five open bracket 2x minus one or close bracket is equal to 35 then x is equal to So 5 open bracket 2x - 1 is equal to 35 and x is equal to so we can either distribute this 5 or we can take over 5 let's distribute it since that's how we know to work it.

[00:46:17]So 5 * 2x would give me 10x 5 * -1 would give me -5 is equal to 35.

[00:46:24]Um so 10x is equal to we carry over this -5 become +5.

[00:46:30]This would be 40 35 + 5 is 40.

[00:46:33]So x would be equal to 40 this 10 is multiplying take it over to divide.

[00:46:39]So x is equal to 4 which is simply D as the answer.

[00:46:47]All right this one here now 7 times the product of two numbers AB may be written as Drop this one here quick 7 times the product of AB.

[00:47:01]7 times the product of AB All right so the product of AB will be AB obviously.

[00:47:12]Um 7 times that would be 7 AB so it's simply A is the answer.

[00:47:22]I'm going to share the live share the live there friend nothing better to do on a Friday night especially if the paper to be to operate.

[00:47:30]You got to you got to drill these paper ones.

[00:47:34]So item 34 is to the following diagram of a trapezium so we know it's a trapezium.

[00:47:40]So the trapezium with a with height h has an area of x² cm².

[00:47:47]The equation to find a val the equation that may be used to find a value of x is So you know the formula to find area of a trapezium is um half the sum of the parallel sides which is a plus b times the height.

[00:48:05]So, in this case it told us that the area is x squared. So, we can say x squared instead of the area is equal to half um the sum of the parallel sides. So, the parallel sides would be 2 plus x minus 4.

[00:48:21]Put that in bracket if you want. What is a plus so it won't really change anything.

[00:48:25]So, times the height um which is h.

[00:48:30]So, we can say x squared will be equal to um so 2 plus x minus 4. If we put it minus 4 and the 2 together is a 2 minus 4 plus x.

[00:48:46]2 minus 4 would give me a negative 2 plus the x.

[00:48:51]So, I can say x minus 2. This is the same thing.

[00:48:54]So, when we work out the bracket I'll have x minus 2 times the height.

[00:48:59]So, let me see if you got any that look like look that looks like that.

[00:49:02]So, I can multiply the height and the half.

[00:49:05]So, half times the height would simply give me h over 2.

[00:49:10]So, this is h over 2 multiplied by x minus 2.

[00:49:15]Let me see any looks like that. Um yeah, A.

[00:49:19]So, x squared is equal to that.

[00:49:21]All right, so we just needed to needed to do some simplification.

[00:49:36]All right, this one here nice and easy.

[00:49:41]Sorry, I could use you as a calculator in CSEC maths.

[00:49:46]So, if 3n is an odd number which of the following is even number?

[00:49:51]Which is an even number?

[00:49:54]My brain as a student I would say I already have three as an odd number. Do I know any odd numbers? I would just say um, you know, three. Three is an odd number.

[00:50:02]Which of the following would be an even number? So I say I minus if I minus one from three.

[00:50:06]That would give me two and two is an even number.

[00:50:10]So already I know this here is an even number.

[00:50:13]And if you add an even number three and you add two to it I'll get five. So that is not even.

[00:50:18]If I minus two, I'll get one and that is not even.

[00:50:23]And if I should ever work with this piece I will still I will not get um I will not get an even number, right? So A is the answer here.

[00:50:37]If calculators are allowed in people, what I'm telling you would have passed.

[00:50:43]No, if calculators were allowed they would have made it harder, right?

[00:50:48]So A is the answer here.

[00:50:50]3n is odd. Of course, if you want to turn it into an even number you just minus one. Common sense, right?

[00:50:57]So let's look at this one. The determinant of an of the identity matrix is This one is one and um The determinant of the identity matrix is simply one. All right, this is a very popular question.

[00:51:10]The answer is one. Um I think the determinant the identity matrix is 1 0 0 1, I think.

[00:51:16]1 0 0 1.

[00:51:18]Yeah, man. I think it's this.

[00:51:20]1 * 1 is 1. 0 * 0 is 0. So 1 - 0 is 1.

[00:51:24]So this is the determinant.

[00:51:26]So it's one.

[00:51:32]So let's look at this one here, now.

[00:51:35]It's 23 for the following diagram of a parallelogram in which EF is parallel to HG and EG is parallel to FG. EF is equal to K and EG is equal to M.

[00:51:48]EG in terms of K and M is so EG EG would be from E to G.

[00:51:57]So from E to G, we can see we can go from E to F which will give me K.

[00:52:04]Plus I can move from F to G.

[00:52:07]It will simply be M since that is parallel. So plus M. So K plus M that is the answer there, nice and easy.

[00:52:16]Nice and easy mark.

[00:52:22]How we looking at YouTube?

[00:52:28]How we looking at TikTok?

[00:52:34]Say if the vectors P and Q are 3 2 respectively then P minus 2 Q is So we know this is P and this is Q. So P minus 2 Q would be 3 2 minus 2 times um -1 4.

[00:52:57]So this will be 3 2 so I can multiply 2 by everything here minus so I can say 2 times -1 is -2 2 times 4 would be 8. So now I can work this out at top piece will be 3 minus -2 and the bottom piece will be 2 minus 8.

[00:53:21]All right, so this will be 3 minus -2 this will be same as 3 plus 2 which will be 5. 2 minus 8 would be a -6.

[00:53:29]So 5 -6 which will be D.

[00:53:44]Mhm.

[00:53:50]>> How we looking here?

[00:53:53]All right, good.

[00:54:07]So, 3,800 mm expressed in in meters is So, we want to convert millimeters to meters.

[00:54:17]So, we know the mnemonic Many Chinese died many days Hong Kong.

[00:54:25]So, first M is mm. So, you want to convert from millimeters to meters, 1000.

[00:54:31]So, we see we dividing by 1,000.

[00:54:35]So, this would be 3,800 / 1,000.

[00:54:40]This zero go with that zero. This zero go with that zero. This zero bring this back here.

[00:54:44]So, this would be 3.8.

[00:54:46]So, 3.8 it simply B as the answer.

[00:54:55]And then they ask similar question again. Given that 1 mm is equal to 1 over 1,000 m, then 2,500 mm in meters is So, um This should be the same as 2,500 um divided by 1,000.

[00:55:17]This zero go with that zero. This zero that zero. This zero bring this back here. So, 2.5.

[00:55:23]Which should simply be again. Let me see. Same thing they ask us to do up here, no?

[00:55:28]But, similar similar approach.

[00:55:34]Then they ask They ask you again the same question in a different way.

[00:55:38]250 mm expressed in meters. As you can see the top here, they give you the conversion.

[00:55:44]Then in this one area, they just ask you to convert it without giving you the conversion.

[00:55:50]All right, so this would be 2,500 / 1,000. You know this answer will be 2.5.

[00:56:01]So, the cube The volume of a cube whose whose edge is 6 cm long is So, 6 cm long we're dealing with a volume, so it's 6 * 6 * 6.

[00:56:15]So, 6 * 6 is 36. 36 * 6 That would give me I know it won't give me 18. I know it won't give me this. I definitely know it won't give me 72. So, by common sense, I know the answer is D.

[00:56:27]Let me work it out though. 6 * 6 36.

[00:56:30]6 will go here. 6 * 3 is 18. 18 and 3 would give me 21. So, 216 cm cubed.

[00:56:41]I already see a lot of people telling me B on TikTok and C.

[00:56:46]It's not 6 * 3, folks.

[00:56:49]It's not 6 * 3 at all, right? It's It's 6 * 6 * 6.

[00:56:55]Right? Careful.

[00:56:58]Careful. Careful.

[00:57:00]So, a very similar one now. The volume in cm cubed of a cube of edge 3 cm would be So, volume again would be 3 * 3 * 3.

[00:57:12]Some people would wind up and go and say 3 * 3 * 3 is 9 and they wind up.

[00:57:17]And then they come on to say the exam was easy. The exam was easy, but you got to be careful, right?

[00:57:29]So, 3 * 3 is 9. 9 * 3 would be 27.

[00:57:34]Which is simply C.

[00:57:49]So once again a very similar one the volume of a cube with edge 10 cm is so 10 * 10 * 10 10 * 10 is 100 100 * 10 would be 1,000.

[00:58:18]Now this one here now change it up a bit.

[00:58:20]The length of the edge of a cube that has a volume of 27 cm cube is So in this case they give us the volume and they want us to find the length of one side.

[00:58:30]So we basically got to find the cube root of 27.

[00:58:37]And we definitely know the cube root of 27 can't be 9, can't be 6, can't be 4.5. It obviously got to be 3.

[00:58:44]Cuz 3 * 3 * 3 would give me 27.

[00:58:49]So the answer here is simply A.

[00:58:58]Cube root means what can you multiply by itself to give you 27? What can you multiply by itself three times to give you 27?

[00:59:04]All right.

[00:59:05]So we running through these here boy.

[00:59:09]So this item I item 24 refers to the following diagram which shows a cylinder with diameter 6 cm and height 20 cm.

[00:59:19]The volume in cm cube of the cylinder is So we know to find the volume of a cylinder it's pi r squared times the height.

[00:59:33]All right, so the volume would be pi the the pi is included in the answer so we'll leave pi. So pi multiplied by r so some people will wild up and go and put r as six but r is the the six here is a diameter so r will obviously half of that which is three.

[00:59:51]So this is multiplied by three squared so you can say three times three multiplied by the height which is 20.

[00:59:59]So three threes nine nine times two would be 180 180 times pi would be 180 pi. So the answer here is A.

[01:00:11]180 pi.

[01:00:26]Same the one.

[01:00:28]I attempt 47 for the following diagrams.

[01:00:30]The diagram above not drawn to scale shows a cylinder of radius 3 cm and height 8 cm.

[01:00:36]The volume of the cylinder is So once again in this case they gave us the radius as three.

[01:00:42]So we can say volume is equal to pi r s squared times the height.

[01:00:48]So the volume is equal to pi so pi is included in the answer so we'll leave pi.

[01:00:53]And remember it's it's it's um it's multiple choice so they won't ask you to calculate with pi unless something will cancel out somewhere or the other.

[01:01:02]>> [snorts] >> So r would be three so r squared would be three squared which would be three times three times the height which is eight.

[01:01:09]So this would be pi multiplied by three threes nine.

[01:01:13]And nine eights or eight times nine would be 72.

[01:01:20]So 72 times pi would be 72 pi, which is simply C.

[01:01:29]Will these will these be posted now will be live on will live on YouTube as well, right?

[01:01:35]I don't know where it will be posted but it's it's live on YouTube.

[01:01:39]Right? This is live on YouTube, so.

[01:01:44]So, you can go back over to YouTube and watch it back if you want.

[01:01:51]I attempt our 34 is the following diagram which shows a cylinder with diameter 60 m and height h cm.

[01:02:00]If the volume of the cylinder in terms of pi is 180 pi cm cubed, then the height of the cylinder is So, the volume is equal to um pi r squared times the height.

[01:02:20]So, they told us that the volume is 180 180 pi um is equal to pi times In this case, the radius would be three.

[01:02:34]This would be three times three times the height that is what we want to find.

[01:02:42]So, three times three is nine. Nine times pi is nine pi times h is equal to 180 pi.

[01:02:51]So, the height would be equal to 180 pi.

[01:02:55]So, this nine pi is multiplying when you obviously take it over to divide divided by nine pi.

[01:03:01]The pi will cancel out. And nine ones nine nine into 18 two.

[01:03:07]So, two and a zero will be 20.

[01:03:10]So, the height is equal to 20 which is B.

[01:03:14]And if you want you can plug this in your cal- I think you got a calculator how you doing have calculator but plug it back into the equation and see if you get back the answer.

[01:03:24]So it's like I got to block some people.

[01:03:26]I mean let me hold you block on TikTok live.

[01:03:29]Let me see.

[01:03:32]Chris Chris that's sending those emojis block.

[01:03:40]All right, enjoy.

[01:03:43]I'm sure I think you're on the live Chris.

[01:03:47]I think you're on the wrong live I'm sure I'm sure what you're doing here.

[01:03:51]You're on the wrong side of TikTok. This is the this is the this This is the um education side of TikTok.

[01:04:01]I got the wrong side.

[01:04:04]All right.

[01:04:06]Crazy man.

[01:04:11]Uh the wrong side the wrong side of TikTok.

[01:04:16]Wrong side wrong side.

[01:04:20]All right.

[01:04:30]All right um So a a rectangular garden plot 15 m long and 12 m wide is used to plant fruits and vegetables. If 80 m squared of the plot is used to plant vegetables what area of the plot is planted with fruits?

[01:04:54]So we got this we got this rectangular plot and so 15 * 12 and 80 m squared is used to plant vegetables then the remaining area will be used to fruit, so the area will be 15 * uh 15 m * 12 m.

[01:05:19]Um Remember no calculator, so you got to do this the old the the primary school way, the traditional way.

[01:05:25]Um 15 * 12, so put a zero there. 1 * 5, 1 * 1.

[01:05:31]2 fives 10.

[01:05:33]2 ones 2 and 1 3, so 180 is the total number of um total area of the whole thing, 180. And out of this 180, 80 m um is used to plant vegetables. So, the remainder will use to plant fruits. So, 180 - 80 will obviously give me 100.

[01:05:59]So, 100 m³ would be B.

[01:06:03]All right?

[01:06:14]>> [clears throat] >> Different question, similar similar approach. And that is the thing, that is why, you know, it's good to practice a lot.

[01:06:24]So, in a rectangular plot 15 m long and 12 m wide, an area of 80 80 m² is used for a vegetable garden. What area of the plot is not used for vegetable gardening?

[01:06:39]So, once again, we find the total area of the plot, which is 15 m * 12 m.

[01:06:47]When we do our math, we know this will give us 180 m².

[01:06:51]So, if 80 is used for vegetable garden, let's minus 80.

[01:06:58]This will give us 100 m² is not used, so this is B.

[01:07:06]We're looking at some CXC math CSEC math, right? CSEC math CSEC mathematics multiple choice.

[01:07:22]How long have you been live?

[01:07:24]Yeah, I'll do it on your Friday. How do Friday? How how How did the week of exams Um how did the week of exams have you all?

[01:07:35]I'll enjoy the exams.

[01:07:37]How was it which one was the hardest which one was the easiest?

[01:07:40]Which exam spoiled which exam spoiled your week?

[01:07:52]Which exam spoiled your week?

[01:07:58]Which exam made your week?

[01:08:03]Let me see.

[01:08:04]They keep talking saying maths maths spoiled the year.

[01:08:08]Maths maths maths all the exam hmm that's not good.

[01:08:13]IT but that is I saw a person saying IT was I IT was good man.

[01:08:20]Science YouTube saying science and maths.

[01:08:25]POB here it leak.

[01:08:28]Here's the thing. Here's the thing folks. People ask me why what are my thoughts on the leak?

[01:08:33]What are my thoughts on the leak? What are my thoughts on this here? What are my thoughts on that? I'll share my thoughts after the exam. I don't I I want I I practice what I preach.

[01:08:43]My my I would I would tell my students focus on the exam ahead of you. Don't focus on things you can't control. If the exam was leaked you have no control of what will happen.

[01:08:54]You have control of what you will write on the paper.

[01:08:57]So I will share my thoughts after the exam is done and and after cuz I don't want to add to anybody's stress.

[01:09:04]I don't want to, you know, cause you to worry unnecessarily.

[01:09:09]Well, I mean, as an individual.

[01:09:13]So, I would My advice to you, my thoughts on leak, focus on the exam ahead. Don't focus on things you can't control. Right?

[01:09:20]Don't focus on things you can't control.

[01:09:25]Fam, you know, I Let me see this back like I'll come back and screen you guys and put this on my WhatsApp. Let me see it back.

[01:09:32]These are my thoughts on the the the leak and the the math exam.

[01:09:36]Focus on the future. Focus on the exams that you have coming up and not on the past.

[01:09:41]It makes no sense worrying about leaks.

[01:09:44]And I'll come back and screen you guys that.

[01:09:47]Anyways, so item 194 to the following table which shows the number of books 58s Well, the number of books 58 students bought at a sale.

[01:09:58]Um the mode number of books bought is So, the mode number of books So, so which books students in the most number of students bought? So, we see 13 students bought five books. So, the mode number of books bought would be five because 13 students bought them. So, this answer here is A. Some students would wild up and go and put 13, but 13 is the amount of people that bought the books.

[01:10:23]The mode number of books, the answer has to come from the number of books.

[01:10:28]Don't wild up and go and put 13. Right?

[01:10:30]Don't wild up and put 13.

[01:10:32]Don't wild up at all.

[01:10:45]All right, I think I learned enough. So, let me run here and wrap up.

[01:10:49]So, item 194 to the following which shows the number of books that 58 students bought at a sale.

[01:10:54]The mode number of books bought We did this just now.

[01:10:57]This is at a different year.

[01:10:59]More number of books bought is five.

[01:11:02]The median number of books bought at the sale is So median would be the middle number.

[01:11:08]So if you got 58 students um the median would be n plus one divided by two. So this would be 58 plus one divided by two.

[01:11:20]This would be 59 divided by two. This would be this is like you got 60 divided by two. It would be 30. So 59 divided by two would be 29.5.

[01:11:30]So 29.5 This is basically telling me between the the the 29th number and the 30th number I can find the median.

[01:11:41]So I have to find which is the 29th number and the 30th number and add them together and divide it by two.

[01:11:47]So let me see um So I got nine and nine 18. So I didn't reach my nine as yet.

[01:11:57]18 and 13 18 and 13 would be 18 plus 13. This would be um two 32.

[01:12:10]So the median would fall right in between here.

[01:12:15]Right?

[01:12:16]When I reach the 30th number the 30th number would be five.

[01:12:20]Well, the 29th number would be five and the 30th number would be five. So the median would fall right in between here five and five is 10. 10 divided by two is simply five. So B is the answer there.

[01:12:41]I'll make breakfast in the morning. I promise. When you're on the side of Tik Tok by oh my.

[01:12:48]Let me block this account.

[01:12:51]My oh my.

[01:12:52]>> My oh my.

[01:13:03]The wrong side of Tik Tok by Oh my.

[01:13:09]How did you get there? Why?

[01:13:16]Oh me, oh my.

[01:13:39]15 is the third one. I I the way I the way it I the way um so third one I the way the median will still fall there, right? Because the 29 number would be the same five and the third number would be a 530. Doesn't matter. As long as you you know, we we want the 29 and the 30 number. So that that won't really matter. I mean it's a simple mistake, but it won't affect the answer.

[01:14:02]Anyways, so last one for the night.

[01:14:06]Last one for the night um Item 29 for the following scores which are obtained by 11 students in a competition. The modal score is So the modal score um I can already see that three occurs a lot. So we got one, two, three, four.

[01:14:23]Four threes.

[01:14:26]So we got um If you put in order it would be easier, right? So you put in order it's a three.

[01:14:35]three three three and I got five and I got six six and I got seven and I got eight And then I see 11. So, three is three is obviously the mode. So, that is the answer there.

[01:14:57]Three. The mode that score, the one that occurs the most.

[01:15:00]So, we can we can we can stop here for tonight.

[01:15:23]As every night, I'll try to go live, right? Every night, I'll try to go live.

[01:15:26]So, if you're not If you're not following If you're not following the account, you know, ensure you follow so that you you don't miss. I started a good while ago. I started like an hour ago, right? So, if you're now joining in, if you're now joining in, well, you miss you miss the first part.

[01:15:43]All right. So, the rest of the live is on YouTube.

[01:15:45]You can check it out from the call now.