This video teaches two key math skills for second-grade students: (1) Mental math addition strategies using the 'make a 10' method, where students break down addition problems by creating a 10 to simplify calculations (e.g., 9+6 becomes 10+5=15, 6+8 becomes 10+4=14); (2) Solving word problems by working backward using subtraction to find starting amounts (e.g., if someone ends with 8 rocks after getting 2 more, they started with 6 rocks). The video uses interactive games, counters, and multiple representations to reinforce these concepts.
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#learning i-Ready ( Level B is Second grade)4/26/2026追加:
Hi everyone, since we always do reading, today guess what we will do?
Correct, we're going to do math. So let's click on it and enjoy.
Start lesson.
Hi again.
Are you ready to practice some more math skills?
We'll unlock different doors on our quest to the quiz. Let's go.
It's time to practice adding using mental math.
Ooh, look.
Use this to unlock the door.
Let's find 9 + 6 by making an easier problem.
Make a 10.
Nailed it. Now we have 10 + 5.
That's 15.
Now let's find 9 + 6 in another way.
Make a 10 again.
You made the connection. Now we have 5 + 10.
That's 15 again.
Find 6 + 8 by making an easier problem.
Make a 10.
Indeed. Now we have 10 + 4.
That's 14.
Now find 6 + 8 in another way.
Make a 10.
I am impressed. Now we have 4 + 10.
That's 14 again.
What is 8 + 4?
Find the sum.
Fired up.
8 + 4 = 12.
What is 5 + 9? Find the sum.
Good thinking.
5 + 9 = 14.
What is 4 + 7? Find the sum.
Nice move.
4 + 7 = 11.
What is 9 + 2? Find the sum.
Well done.
9 + 2 = 11.
Let's play math match with addition.
Match addition problems that have the same answer.
Good going.
Next round.
Match addition problems that have the same answer.
I knew you could do it.
Next round.
Match addition problems that have the same answer.
Youp youp.
Last round.
Match addition problems that have the same answer.
Which addition tiles are equal to 11?
Woohoo.
Which addition tiles are equal to 13?
6 + 7 will be one, but there's no 6 + 7 anywhere.
Get [screaming] out.
Nice move.
Which addition tiles are equal to 15?
>> Boop boop.
What's next? Tap on the green arrow button to keep going.
Your quest is almost complete.
Use the star to unlock the quiz.
After this it's going to say nice job. You received 20 coins.
What is 7 + 4?
Not 7, 11.
What is 8 + 9?
8 + 9 equals 17.
What is 9 + 3?
What is 5 + 8?
What is 7 + 9?
What is 8 + 3?
Nice job. You received 20 coins.
Hi.
I told you guys it would say nice job, you received 20 coins.
Start lesson.
Be quiet. Well, do you want to do another one, guys? Or we're going to keep or we're going to just stay.
Since there's going to be Since there's going to be a lot of views on this video you're basically going to be like, "Let's go. Let's go. Let's go."
So, we are going to go.
I don't know if it's going to take an hour.
We'll see.
You, I've got some new word problems for us to solve.
Let's do it.
Emma has some rocks.
She gets two more rocks.
Now, Emma has eight rocks.
How many rocks did Emma start with?
Move each picture to its part of the story.
Great.
How many rocks did Emma start with?
Let's work backward to find how many rocks Emma started with. Emma ended with eight rocks. Let's show that with counters.
Emma got two rocks before she ended with eight rocks. Subtract two to find how many rocks Emma started with. Turn over two counters.
How many rocks did Emma start with?
Malik has some acorns.
He collects five more acorns.
Now, Malik has 12 acorns.
How many acorns did Malik start with?
acorn Move each picture to its part of the story.
Nailed it.
How many acorns did Malik start with?
You can use counters to help you solve the problem.
Even if I know the answer, we're still going to do use counters, guys.
Indeed.
Complete the subtraction equation for the problem.
Complete the addition equation for the problem.
You made the connection.
You can use either of these equations to show that Malik started with seven acorns.
Check out all these videos, guys.
Please like, comment, share, and subscribe.
I'll make more videos if you like if you keep liking, comment, share, and subscribe.
I hope you have fun.
Now you know all my videos that I have.
I'll put a little song.
And this what song >> [music] >> She folds nine more boats.
Now, Alana [music] has 18 boats.
>> It sounds kind of boring.
>> did Alana start with?
Woohoo!
Complete the subtraction equation for the problem.
Complete the addition equation for the problem.
Numberific.
Some butterflies are in a bush.
Six more butterflies join.
Now, there are 11 butterflies in the bush.
How many butterflies were in the bush to begin with?
Move each picture to its part of the story.
>> Which equations can be used to solve the problem?
Choose all the correct answers.
Amazing.
How many butterflies were in the bush to begin with?
Well done.
You can use either of these equations to show that five butterflies were in the bush to begin with.
>> [snorts] >> Some kids are ice skating.
Seven more kids join them.
Now there are 16 kids ice skating.
How many kids were ice skating to begin with?
Which equations can be used to solve the problem?
Choose all the correct answers.
Way to you.
How many kids were ice skating to begin with?
Out of this world.
You can use either of these equations to show that nine kids were ice skating to begin with.
Ew, that was awesome. Yeah, high five.
High two.
What's next?
Tap on the green arrow button to keep going.
Tiana has some pennies.
She gets six more pennies.
Now Tiana has 13 pennies.
How many pennies did Tiana start with?
Move each picture to its part of the story.
Which equations can be used to solve the problem?
Choose all the correct answers.
How many pennies did Tiana start with?
Complete the sentence.
Some birds are in a tree.
Four more birds join them.
Now there are 12 birds in the tree.
How many birds were in the tree to begin with?
Move each picture to its part of the story.
Which equations can be used to solve the problem?
Choose all the correct answers.
How many birds were in the tree to begin with?
Complete the sentence.
Nice job. You received 20 coins.
Bye-bye everyone. See you on the next video.
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