Doubling 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.
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.
- Free Year 6 Maths Worksheets
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