Subtracting from multiples of 10 in your head by mathsblog.co.uk

Subtracting a 2 digit number from a multiple of 10 can be done ‘in your head’, but it does need care and using an efficient method.

Let’s look at:

50 – 27

Probably the easiest way to do this is by ‘counting on’.

Step 1: Count on from 27 to [...]

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