More doubling and halving

More work on doubling and halving, including larger numbers and fractions.

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Revise understanding multiplication

Another look at multiplying by zero and one, and the relationship between multiplication and division.

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Revise doubling and halving

Doubling 2-digit numbers and halving 3-digit numbers mentally.

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Some people like to start doubling with the units, others like to start with the tens. It doesn?t matter as long as the method is fast and accurate.

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Even more doubling and halving

When we are multiplying by a number ending in 5 we can double the number and halve the other number before multiplying (by a multiple of ten, making it easy).

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