What number is 20 less than 90?

When solving a question like "What number is 20 less than 90?", take a close look at what it is really asking.

You have the number 90 and you are looking for a number that is 20 less than 90. In other words, if you have 90 and take away 20, then how many do you have?

You guessed it! This is a subtraction problem. 90 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 90?", you subtract 20 from 90 like so:

90 - 20 = 70

Less Than Calculator
Need another answer? Enter another "What number is X less than Y?" problem below:

What number is 20 less than 91?
Proceed to the next problem on our list that we explained and answered.