Relate addition and subtraction (2)

Given one fact helps with working out similar facts.

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Adding and subtracting numbers that cross the thousands boundary: often ?counting on? is the best method.

Add twenty and take one is much quicker than trying to add nineteen. But not always!

In these questions, you are told one fact about a sum. Write down three others without doing any more calculating.

Subtract multiples of one hundred by counting back.

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