When you ask "What number is halfway between 21 and 772?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=21 and Y=772.
To find the number halfway between 21 and 772, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 772 into our formula, we get:
(21 + 772)/2 = 396.5
Thus, the number halfway between 21 and 772 is 396.5.
To check that our answer is correct, we subtract 21 from 396.5 and subtract 396.5 from 772 and compare the two numbers:
396.5 - 21 = 375.5
772 - 396.5 = 375.5
As you can see, the halfway number is 375.5 higher than 21 and 375.5 lower than 772. Therefore, our halfway between answer of 396.5 above is correct.
Halfway Between
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Halfway Between 21 and 773
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