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Mental Maths Workbook - Divide by 5 or 10


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Dividing any number by 5 or 10 is simple - once you know the trick!

Dividing by 10 is trivial. Simply drop the last digit of the dividend to arrive at the answer.


Division by 5 is almost as simple. The trick is to multiply the dividend and the divisor by 2, which will make the divisor end in a multiple of 10. This reduces the problem to a single digit division.

For example, conside the following problem:


If we multiply the divisor and dividend both by 2


If the divisor is 25, then we can multiply the dividend by four and then the problem becomes a division by 100.


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