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Subtracting with Regrouping a Ten

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Note: This worksheet follows on from this one and you might want to have a look at it first.

Look at the example below and then try the questions that follow on page 2.

To subtract 27 we need to take away 2 tens and 7 ones. Looking at the blocks we can see that, with 42, we only have 2 ones. We will need to regroup a ten.

 

base 10 blocks showing 4 tensbase 10 blocks showing 2 ones

4 2
- 2 7

 

We break the regroup ten into 10 ones. We now have 3 tens and 12 ones so we score out the 4, replace it with a 3 and make the 2 into a 12. 42 - 17 showing regrouping 10
We can do the subtraction starting with the ones and then the tens. 42 - 17 showing regrouping 10 with answer of 15

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"Regroup ten", as shown in the example on page 1, to do the subtractions in the questions below. Score out the place value blocks to show what is taken away and what is left.

base 10 blocks showing 7 tensbase 10 blocks showing 2 ones

7 2
- 4 5

arrow pointing down  
base 10 blocks showing 6 tensblocks showing 10 onesbase 10 blocks showing 2 ones

7 2
- 4 5
27

base 10 blocks showing 2 tensbase 10 blocks showing 3 ones

2 3
- 1 5

arrow pointing down  
base 10 blocks showing 1 tensblocks showing 10 onesbase 10 blocks showing 3 ones

2 3
- 1 5
8

base 10 blocks showing 4 tensbase 10 blocks showing 7 ones

4 7
- 1 9

arrow pointing down  
base 10 blocks showing 3 tensblocks showing 10 onesbase 10 blocks showing 7 ones

4 7
- 1 9
28

base 10 blocks showing 6 tensbase 10 blocks showing 3 ones

6 3
- 5 6

arrow pointing down  
base 10 blocks showing 5 tensblocks showing 10 onesbase 10 blocks showing 3 ones

6 3
- 5 6
7

base 10 blocks showing 5 tensbase 10 blocks showing 3 ones

5 3
- 3 8

arrow pointing down  
base 10 blocks showing 4 tensblocks showing 10 onesbase 10 blocks showing 3 ones

5 3
- 3 8
15

base 10 blocks showing 5 tensbase 10 blocks showing 0 ones

5 0
- 4 5

arrow pointing down  
base 10 blocks showing 4 tensblocks showing 10 onesbase 10 blocks showing 0 ones

5 0
- 4 5
5

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An Addition and Subtraction Worksheet - By HelpingWithMath.com

Related Resources

The various resources listed below are aligned to the same standard, (2NBT07) taken from the CCSM (Common Core Standards For Mathematics) as the Addition and subtraction Worksheet shown above.

Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.

Worksheets

Larger Numbers
Worksheet Generator

Similar to the above listing, the resources below are aligned to related standards in the Common Core For Mathematics that together support the following learning outcome:

Use place value understanding and properties of operations to add and subtract

 

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