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When subtracting numbers we often have to split-up these groups to help
us to do the subtraction. The example below shows this.
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| Start with the ones. 2 - 7 can't be
done. We're trying to take away more ones than we have. We need
more ones! |
Let's take 1 of our tens and split
it into 10 ones. We've now got 12 ones. We've also got 1 less ten. |
We can now do the subtraction:
12 - 7 = 5 ones
3 - 2 = 1 ten |
Subtraction Games
You will find some subtraction games here alongside some games on addition as well.
Help with Subtraction
The National
Library of Virtual Manipulatives has
many excellent resources including these Base
Blocks Subtraction that
you and your child can work with to help grasp the concept of whole
number subtraction, including regrouping, with the base-ten number
system. Read the instructions carefully to ensure you get maximum
benefit from these very good resources.
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