Revise mental addition and subtraction

Revision pages on adding to make multiples of 10 and subtraction of multiples of 10.

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Addition and subtraction of multiples of 100. Easy if you know the totals of pairs of single digits.

Knowing pairs of numbers that make 10 and being able to count in tens make these questions much quicker to answer.

Revising adding and using the relationship between addition and subtraction.