What number is 20 less than 89?

When solving a question like "What number is 20 less than 89?", take a close look at what it is really asking.

You have the number 89 and you are looking for a number that is 20 less than 89. In other words, if you have 89 and take away 20, then how many do you have?

You guessed it! This is a subtraction problem. 89 is the minuend and 20 is subtrahend and the answer we are looking for is the difference.

Therefore, to solve "What number is 20 less than 89?", you subtract 20 from 89 like so:

89 - 20 = 69

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What number is 20 less than 90?
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