Mastering Addition and Subtraction with 10's

The video tutorial teaches how to count, add, and subtract using tens. It begins with counting stickers by tens, then demonstrates adding tens using a hundred chart, and finally explains subtracting tens. Techniques like hiding zeros to simplify calculations are also covered.

If each sheet contains 10 stickers and you have 3 sheets of insect stickers, how many insect stickers do you have?

• 40

• 10

• 20

• 30

What is the sum of 30 insect stickers and 20 flower stickers?

• 30

• 40

• 50

• 60

Using a hundred chart, if you start at 30 and add two tens, what number do you reach?

• 70

• 60

• 50

• 40

What is the result of adding 40 and 40?

• 60

• 80

• 90

• 70

If you have 80 fruit stickers and give away 20, how many do you have left?

• 50

• 80

• 60

• 70

What is the result of subtracting 40 from 50?

• 20

• 15

• 10

• 5

How can you use your knowledge of adding and subtracting tens to solve 60 minus 10?

• 60

• 70

• 50

• 40