What number is 6 less than 21?

When solving a question like "What number is 6 less than 21?", take a close look at what it is really asking.

You have the number 21 and you are looking for a number that is 6 less than 21. In other words, if you have 21 and take away 6, then how many do you have?

You guessed it! This is a subtraction problem. 21 is the minuend and 6 is subtrahend and the answer we are looking for is the difference.

Therefore, to solve "What number is 6 less than 21?", you subtract 6 from 21 like so:

21 - 6 = 15

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