NCERT_textbook_Maths Mela_Grade-4_Subject-Mathematics_Chapter 3_Patterns Around Us

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[00:00:08]Sorry, sorry. Sorry for keeping you waiting. I couldn't find the other socks, so I have to come without socks.

[00:00:15]>> No problem. You could have just come with one sock.

[00:00:18]>> That's funny. You know, Francis, socks always come in two. Well, in this one, he's incomplete.

[00:00:24]>> Yeah, you are right. Socks come in pairs.

[00:00:26]>> Yes, just like shoes. One alone is useless.

[00:00:30]>> We're already running late for the school. Let's go now.

[00:00:33]>> Yes, yes, let's go.

[00:00:50]>> Oh, Rohan, I just heard that your pair, Ritesh, is absent today. You have to sit alone.

[00:00:56]>> Okay, Aditi.

[00:00:59]Mhm, pairs. Socks are a pair. Shoes are a pair. Even my eyes are a pair. So many pairs everywhere.

[00:01:13]>> [music] >> Good morning, ma'am.

[00:01:19]>> Good morning, class. Sit down.

[00:01:21]>> Thank you, ma'am.

[00:01:24]>> Let's quickly recall our last lesson.

[00:01:27]Who remembers what we discussed?

[00:01:32]Aditi, can you tell me what we talked about in the previous class?

[00:01:36]>> Ma'am, we discussed chapter two, hide and seek, that is different types of view, such as top view and side view.

[00:01:45]>> Yes, Rohan.

[00:01:46]>> Ma'am, I was thinking we see things from different views, but what about things that come in pairs? Why are pairs important?

[00:01:55]>> That's a very thoughtful question, Rohan. Let's explore it together. As it's also our topic for today's class, can anyone of you name something that comes in pairs?

[00:02:08]Yes.

[00:02:09]>> Slippers and shoes.

[00:02:11]>> Chopsticks and gloves.

[00:02:13]>> Mhm.

[00:02:14]>> Scissors, headphones, and earrings.

[00:02:16]>> Wonderful.

[00:02:18]All these come in pairs. That is, two things that go together.

[00:02:23]We can make pairs. It will make counting easier for us. Let me show you. Please come forward.

[00:02:32]>> [music] >> I paired buttons for you.

[00:02:36]How many pairs are there?

[00:02:38]>> There are five pairs of buttons of the same color.

[00:02:42]>> Good.

[00:02:44]How many buttons are there?

[00:02:45]>> Ma'am, there are 10 buttons.

[00:02:48]>> How did you count them?

[00:02:49]>> Five pair means 2 * 5, which is equal to 10. That is, 5 * 2.

[00:02:56]>> Well done, Shiksha.

[00:02:57]You may take your seats now.

[00:03:01]One pair is two objects.

[00:03:04]Two pairs are >> Four objects.

[00:03:07]>> Three pairs ARE >> SIX OBJECTS.

[00:03:10]>> WHAT PATTERN [music] do you see?

[00:03:11]>> They are multiples of two.

[00:03:14]>> Mhm. Yes, Rohan.

[00:03:16]>> Pair means two things that go together.

[00:03:19]>> Right.

[00:03:21]They are even numbers, too.

[00:03:24]>> Even numbers.

[00:03:26]>> Yes. When we can group objects into pairs with nothing left over, the number is even. [music] If one is left out, it's odd. Let's count in group. I have seven crayons and six color pencils.

[00:03:42]>> [music] >> Let's pair them. Please come forward.

[00:03:51]>> [music] >> One left out. an odd. Seven crayons.

[00:03:56]>> Nothing left over, it's an even six color pencils.

[00:04:00]>> Great. Let's try again with pens and pencils. [music] >> [music] >> Nothing left over, it's an even 12 pens.

[00:04:11]>> One left out, it's an odd. Nine pencils.

[00:04:14]>> Please go back to your seats.

[00:04:17]So, we have found even numbers that were paired are >> [music] >> 12 and six, whereas odd number that remained unpaired are seven and nine.

[00:04:34]We learned that pairs help us understand even and odd numbers. The numbers that make perfect pairs are even numbers.

[00:04:43]Can someone tell me whether the number of students in class is even or odd?

[00:04:50]Yes, Aditi?

[00:04:52]>> Ma'am, I think we are 15 students in class. It's an odd number.

[00:04:57]>> Mhm. Actually, our class has 16 students including Ritesh. In that case, our classroom has an even number of students.

[00:05:07]>> Oh, no. I forgot Ritesh. He is absent today.

[00:05:11]>> Wow, that's a great observation. You both are correct. Pairs are more important than I thought. I cannot play Ludo and chess without pairing. Have you observed the clock?

[00:05:25]Can you list the even and odd numbers?

[00:05:29]Yes?

[00:05:31]>> Ma'am, can I tell the odd number for the wall clock?

[00:05:34]>> Yes, why not?

[00:05:36]>> 1 3 5 7 9 and 11.

[00:05:41]>> Great. Francis, can you try the even numbers?

[00:05:45]>> 2 4 6 8 10 and 12.

[00:05:50]>> Exactly. Both of you are correct. So, class, what did we learn today?

[00:05:56]Yes, Rohan.

[00:05:57]>> Today, we learned that if everything has a pair buddy, it's even.

[00:06:02]>> [music] >> If someone's alone, it's odd.

[00:06:05]>> Exactly.

[00:06:07]So, viewers, it's your turn [music] to tell us how many brothers and sisters do you have? Is it an even or odd number?

[00:06:16]In which games do we need even number of players?

[00:06:20]>> [music] >> And in which games do we need odd number of players?

[00:06:24]Can you give some daily life examples in [music] which the concept of even and odd number is used?

[00:06:33]>> [music] [music]