Subtract the nearest multiple of 10 and adjust

More adding and taking away 19, 29 etc. Easy if you know how!

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A reminder that subtraction is the inverse of addition, and how this can be useful when working out mental calculations.

Can you say which of these are true and which are false? A quick test of the relationship between addition and subtraction and what effect zero has.

Today we are going to look at a quick way that you can subtract numbers such as 999 from a 4-digit number.

Subtract a number near 1,000 by adjusting.

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