Posted by Peter on 20th October 2007

Free Y6 maths worksheets: Revise doubling and halving

know graphicDoubling and halving can be a very effective way of working out quite difficult number problems in your head. These two free maths worksheets look at this skill.

Some examples:

To multiply a number by 15, multiply by 10 and add on half the answer.

36 x 15 = 360 + 180 = 540

When multiplying a number ending in 5 we can double this number and halve the other number before multiplying.

45 x 84 is: 90 x 42 = 3780

Free Y6 maths worksheets: Revise doubling and halving (pg 3)

Free Y6 maths worksheets: Revise doubling and halving (pg 4)

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