Addition and subtraction of multiples of 10

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

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

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.

Bar models can be a great help when adding mentally. Children may also want to make jottings when doing these.