Bar models: addition and subtraction word problems

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

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

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.

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

Finding change by counting on.

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