Speedy adding 99

Adding 99 by adding 100 and subtracting 1.

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You may have seen tables' grids: these are addition grids and work in just the same way, adding rather than multiplying.

Adding three numbers: stop watches at the ready to see how quickly these can be completed correctly.

Use knowledge of place value to add quickly.

Today we are going to look at a quick way that you can add 99 to a 3-digit number.

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