When you ask "What number is halfway between 21 and 724?" 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=724.
To find the number halfway between 21 and 724, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 724 into our formula, we get:
(21 + 724)/2 = 372.5
Thus, the number halfway between 21 and 724 is 372.5.
To check that our answer is correct, we subtract 21 from 372.5 and subtract 372.5 from 724 and compare the two numbers:
372.5 - 21 = 351.5
724 - 372.5 = 351.5
As you can see, the halfway number is 351.5 higher than 21 and 351.5 lower than 724. Therefore, our halfway between answer of 372.5 above is correct.
Halfway Between
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Halfway Between 21 and 725
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