IXL | Subtract decimal numbers using blocks

The blocks show 4.28. Use them to find

4.28

–

3.12

How will you need to regroup to find

4.28

–

3.12

Regroup 1 tenth as 10 hundredths only.

Regroup 1 one as 10 tenths only.

Regroup 1 tenth as 10 hundredths and regroup 1 one as 10 tenths.

No regrouping is needed.

Subtract.

4.28

–

3.12

ref_doc_title.

Learn with an example

question

The blocks show 4.28. Use them to find

4.28

–

3.12

How will you need to regroup to find

4.28

–

3.12

Regroup 1 tenth as 10 hundredths only.

Regroup 1 one as 10 tenths only.

Regroup 1 tenth as 10 hundredths and regroup 1 one as 10 tenths.

No regrouping is needed.

Subtract.

4.28

–

3.12

solution

You can use the blocks to help you find

4.28

–

3.12

The blocks show 4.28.

ones

tenths

hundredths

To subtract 3.12, take away 3 ones, 1 tenth, and 2 hundredths.

You can take away 2 hundredths from 8 hundredths. So, do not regroup 1 tenth as 10

hundredths.

You can take away 1 tenth from 2 tenths. So, do not regroup 1 one as 10

tenths.

Now, you can take away 3 ones, 1 tenth, and 2 hundredths.

4
ones
–
3
ones
=
1
one
2
tenths
–
1
tenth
=
1
tenth
8
hundredths
–
2
hundredths
=
6
hundredths

one

tenth

hundredths

There is 1 one, 1 tenth, and 6 hundredths left. That is the same as 1.16.

4.28

–

3.12

1.16

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Teacher tools

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Not feeling ready yet? These can help:

W.2Place value models for decimal numbers

E.3Subtract two multi-digit numbers

Add decimals using blocks

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