Pairs that make 100 or 1000

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

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

Quick timed challenge adding three or more small numbers as quickly as possible.

Without doing any working out on paper answer these adding several numbers questions.

Revising adding and using the relationship between addition and subtraction.

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