When you ask "What number is halfway between 20 and 401?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=20 and Y=401.
To find the number halfway between 20 and 401, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 401 into our formula, we get:
(20 + 401)/2 = 210.5
Thus, the number halfway between 20 and 401 is 210.5.
To check that our answer is correct, we subtract 20 from 210.5 and subtract 210.5 from 401 and compare the two numbers:
210.5 - 20 = 190.5
401 - 210.5 = 190.5
As you can see, the halfway number is 190.5 higher than 20 and 190.5 lower than 401. Therefore, our halfway between answer of 210.5 above is correct.
Halfway Between
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Halfway Between 20 and 402
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