Addition and subtraction of multiples of 100

Mental addition and subtraction of multiples of 100, including crossing over the thousands.

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A good revision exercise on mentally adding and subtracting multiples of 10.

A mixed bag of addition and subtraction: good for seeing whether children can use their skills to add and subtract quickly ?in their heads?.

Mental addition questions which get quite tricky.

Add two 4-digit multiples of 100 whith exchange.

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