More doubling and halving

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

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3 pages

Revise doubling and halving

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

4 pages

Mentally doubling and halving

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.

6 pages

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).

4 pages

Multiply by 12 mentally

Some people (especially those who still use feet and inches!!) think it is important to know how to multiply by 12. It?s easy ? just add 10 times the number to 2 times the number.

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