Regrouping in Subtraction Problems

This video tutorial helps students understand subtraction with regrouping. It begins with an explanation of what regrouping means and why it's necessary in subtraction. The instructor then walks through three example problems (62-39, 83-47, and 92-48) to demonstrate the process of regrouping step-by-step. Students are encouraged to practice with a problem (64-27) on their own, with guidance provided for checking their work. The video concludes with a reflection activity to assess understanding.

What does the prefix 're-' in 'regrouping' mean?

• To do something slowly

• To do something quickly

• To do something for the first time

• To do something again

In the problem 62 - 39, why do we need to regroup?

• Because 6 is less than 3

• Because 9 is less than 2

• Because 3 is less than 6

• Because 2 is less than 9

After regrouping in the problem 62 - 39, what does the 6 in the tens place become?

• 7

• 8

• 5

• 4

In the problem 83 - 47, what is the first step after realizing 3 is less than 7?

• Subtract 7 from 3

• Go to the tens place to regroup

• Add 7 to 3

• Subtract 3 from 7

After regrouping in the problem 83 - 47, what does the 8 in the tens place become?

• 6

• 10

• 7

• 9

In the problem 92 - 48, what does the 9 in the tens place become after regrouping?

• 7

• 5

• 6

• 8

What is the result of 12 - 8 in the problem 92 - 48?

• 2

• 3

• 4

• 5

In the practice problem 64 - 27, what is the first step after realizing 4 is less than 7?

• Add 7 to 4

• Go to the tens place to regroup

• Subtract 7 from 4

• Subtract 4 from 7

After regrouping in the practice problem 64 - 27, what does the 6 in the tens place become?

• 4

• 5

• 7

• 8

What is the final answer to the practice problem 64 - 27?

• 36

• 35

• 34

• 37