What number is 91 less than 12?

When solving a question like "What number is 91 less than 12?", take a close look at what it is really asking.

You have the number 12 and you are looking for a number that is 91 less than 12. In other words, if you have 12 and take away 91, then how many do you have?

You guessed it! This is a subtraction problem. 12 is the minuend and 91 is subtrahend and the answer we are looking for is the difference.

Therefore, to solve "What number is 91 less than 12?", you subtract 91 from 12 like so:

12 - 91 = -79

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