Use place value to add

Use knowledge of place value to add quickly.

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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.

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

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

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