Regrouping?

Front

What is regrouping in math?

Back

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

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CCSS.5.NBT.B.7

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When do you need to regroup?

Back

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

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What is the first step in regrouping?

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

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

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

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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.

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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.

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What is borrowing in subtraction?

Back

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

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Is regrouping only used in addition?

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No, regrouping is used in both addition and subtraction.

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What is a common mistake when regrouping?

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

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How can you check your work after regrouping?

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

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