DR MATHS.(News)

From: Evening Chronicle (Newcastle, England) | Date: April 17, 2008 | Copyright information

DEAR Dr Maths, since school I have always had issues with subtractions involving numbers with lots of zeros.

Can you suggest a quick method which would help me?

Karen, Newcastle

An easy way to think about sums like this is to subtract one from the 100 or 1000 number and then add it back on at the end of the calculation.

What this does is to convert your original number to a number that is more easily subtracted from, without the need to ...

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