Two-Digit Subtraction with Regrouping

Front

What is two-digit subtraction with regrouping?

Back

Two-digit subtraction with regrouping is a method used to subtract numbers where borrowing is necessary, typically when the digit in the minuend (the top number) is smaller than the digit in the subtrahend (the bottom number) in any given place value.

Tags

CCSS.7.NS.A.1C

Front

How do you perform subtraction with regrouping?

Back

To perform subtraction with regrouping, start from the rightmost digit. If the top digit is smaller than the bottom digit, borrow 1 from the next left digit, reducing it by 1 and adding 10 to the current digit. Then, subtract as usual.

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Front

In the problem '65 - 28', how do you regroup?

Back

In '65 - 28', you need to subtract 8 from 5. Since 5 is smaller than 8, you regroup by borrowing 1 from the 6 (making it 5) and adding 10 to the 5 (making it 15). Then, you can subtract 8 from 15.

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Front

What is the result of 81 - 56?

Back

The result of 81 - 56 is 25.

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Front

What is the result of 64 - 26?

Back

The result of 64 - 26 is 38.

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Front

What is the result of 83 - 65?

Back

The result of 83 - 65 is 18.

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Front

In the context of the problem, what does 'regrouping' mean?

Back

Regrouping means borrowing from a higher place value to enable subtraction in a lower place value when the top digit is smaller than the bottom digit.

Tags

CCSS.5.NBT.B.7

Front

How many geese are left if 28 out of 65 flew away?

Back

If 28 out of 65 geese flew away, there are 37 geese left on the pond.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Front

If Tim washed 58 plates and 29 were washed again, how many plates were washed only once?

Back

If Tim washed 58 plates and 29 were washed again, then 29 plates were washed only once.

Tags

CCSS.3.OA.D.8

Front

What is the importance of understanding regrouping in subtraction?

Back

Understanding regrouping in subtraction is important because it allows students to accurately perform subtraction problems where borrowing is necessary, ensuring correct answers.

Tags

CCSS.7.NS.A.1C