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.

More mental addition of 3-digit numbers and multiples of 100.

Use knowledge of place value to add quickly.

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