Timed addition grids

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

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

Adding several numbers. A useful tip is to look for pairs of numbers that make 10 and do that part of the sum first.

Use knowledge of place value to add quickly.

Adding 99 by adding 100 and subtracting 1.

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