What number is 20 less than 30?

When solving a question like "What number is 20 less than 30?", take a close look at what it is really asking.

You have the number 30 and you are looking for a number that is 20 less than 30. In other words, if you have 30 and take away 20, then how many do you have?

You guessed it! This is a subtraction problem. 30 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 30?", you subtract 20 from 30 like so:

30 - 20 = 10

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