Understanding Regrouping in Subtraction

The video tutorial teaches subtraction using two-digit numbers with base 10 blocks and regrouping. It begins with a review of the one's and ten's columns, followed by an introduction to regrouping. The tutorial includes practice problems for basic subtraction and regrouping, emphasizing the use of rods and cubes. The video concludes with a recap of when to use regrouping.

What does the one's column represent in a number?

• The number of thousands

• The number of tens

• The number of hundreds

• The number of ones

If a number is 67, how many tens does it have?

• 67

• 60

• 7

• 6

What is regrouping in subtraction?

• Breaking up a group of 10 to carry to the one's place

• Adding a group of 10 to the one's place

• Dividing by 10

• Multiplying by 10

How many cubes are equal to one rod?

• 5

• 10

• 15

• 20

What is the result of 13 - 10 using base 10 blocks?

• 4

• 3

• 2

• 1

When subtracting 25 - 16, what do you do if you run out of cubes?

• Add more cubes

• Break apart a rod to make ten ones

• Subtract from the tens column

• Start over

What is the final answer for 25 - 16 using regrouping?

• 8

• 7

• 9

• 10

In the problem 37 - 28, how many rods do you start with for 37?

• 5

• 4

• 3

• 2

What do you do if you run out of cubes when subtracting the one's column in 37 - 28?

• Add more cubes

• Break apart a rod to make ten ones

• Subtract from the tens column

• Start over

When do you use regrouping in subtraction?

• When both numbers are equal

• When the bottom number is bigger than the top number

• When subtracting single-digit numbers

• When the top number is bigger than the bottom number