Add and subtract 10 100 1000

Add and subtract 10, 100 and 1000.

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A quick look back including multiplying and dividing by 10 and 100, ?in your head?.

Here we have some word problems which can all be solved by multiplying or dividing by 10 or 100.

Tips and hints on using a calculator, including negative numbers and recurring decimals.

Tricky questions around the million.

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