Addition and subtraction: inverse

A reminder that subtraction is the inverse of addition, and how this can be useful when working out mental calculations.

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Can you say which of these are true and which are false? A quick test of the relationship between addition and subtraction and what effect zero has.

More adding and taking away 19, 29 etc. Easy if you know how!

Using bar models to help with addition and subtraction word problems.

Subtract a number near 1,000 by adjusting.

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