Regrouping?

Front

What is regrouping in math?

Back

Regrouping is a method used in addition and subtraction to make calculations easier by rearranging numbers.

Tags

CCSS.5.NBT.B.7

Front

When do you need to regroup?

Back

You need to regroup when the sum of the digits in a column is greater than 9.

Tags

CCSS.2.NBT.B.5

CCSS.1.NBT.C.4

Front

What is the first step in regrouping?

Back

The first step is to add the digits in the same place value.

Tags

CCSS.2.NBT.B.5

CCSS.1.NBT.C.4

Front

What do you do if the sum is greater than 9?

Back

If the sum is greater than 9, you write down the right digit and carry over the left digit to the next column.

Tags

CCSS.2.NBT.B.5

CCSS.1.NBT.C.4

Front

Can you give an example of regrouping in addition?

Back

Sure! In 27 + 36, you add 7 + 6 = 13. Write down 3 and carry over 1 to the next column.

Tags

CCSS.2.NBT.B.5

CCSS.1.NBT.C.4

Front

What happens in subtraction if you need to regroup?

Back

In subtraction, if the top digit is smaller than the bottom digit, you need to regroup from the next column.

Tags

CCSS.2.NBT.B.7

Front

What is borrowing in subtraction?

Back

Borrowing is when you take 1 from the next column to make the top digit larger.

Tags

CCSS.6.NS.B.3

Front

Is regrouping only used in addition?

Back

No, regrouping is used in both addition and subtraction.

Tags

CCSS.5.NBT.B.7

Front

What is a common mistake when regrouping?

Back

A common mistake is forgetting to carry over or borrow correctly.

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Front

How can you check your work after regrouping?

Back

You can check your work by adding or subtracting the numbers again to see if you get the same result.

Tags

CCSS.2.NBT.B.7