Harder mental subtraction

Problems in words. Not too tricky, but ask how they were done as this reveals a great deal about children's thinking.

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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.

Finding change by counting on.

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

Use the place value table to help add and subtract.

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