Subtraction and Counting Strategies

The video tutorial teaches subtraction by counting down to 10. It begins with a scenario involving marbles to introduce the concept. The lesson reviews different ways to make ten and demonstrates how counting down can help in subtraction. It uses examples like 18 minus 3 and 15 minus 7, employing ten frames as a visual aid. The tutorial concludes with a practical example of subtracting marbles, reinforcing the concept of counting down to subtract.

Lily starts with 15 marbles and gives some to Zim. How many does she give away?

• 5

• 6

• 7

• 8

Which of the following pairs add up to 10?

• 1 + 8

• 2 + 9

• 5 + 6

• 3 + 7

What is the result of 18 minus 3 using the counting down method?

• 12

• 14

• 15

• 13

If you start at 18 and count down 8, where do you end up?

• 12

• 10

• 9

• 11

How do you break down 7 to use ten frames for subtraction?

• 4 + 3

• 5 + 1

• 5 + 2

• 6 + 1

What is the result of 15 minus 7 using ten frames?

• 9

• 6

• 7

• 8

How many marbles does Lily have left after giving some to Zim?

• 8

• 9

• 11

• 10

What is the first step in solving 15 minus 6 using the counting down method?

• Subtract 3

• Subtract 4

• Subtract 5

• Subtract 2

After subtracting 5 from 15, what is the next step to find 15 minus 6?

• Subtract 4

• Subtract 1

• Subtract 2

• Subtract 3