What number is 40 less than 57?

When solving a question like "What number is 40 less than 57?", take a close look at what it is really asking.

You have the number 57 and you are looking for a number that is 40 less than 57. In other words, if you have 57 and take away 40, then how many do you have?

You guessed it! This is a subtraction problem. 57 is the minuend and 40 is subtrahend and the answer we are looking for is the difference.

Therefore, to solve "What number is 40 less than 57?", you subtract 40 from 57 like so:

57 - 40 = 17

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