When you ask "What number is halfway between 21 and 726?" 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=726.
To find the number halfway between 21 and 726, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 726 into our formula, we get:
(21 + 726)/2 = 373.5
Thus, the number halfway between 21 and 726 is 373.5.
To check that our answer is correct, we subtract 21 from 373.5 and subtract 373.5 from 726 and compare the two numbers:
373.5 - 21 = 352.5
726 - 373.5 = 352.5
As you can see, the halfway number is 352.5 higher than 21 and 352.5 lower than 726. Therefore, our halfway between answer of 373.5 above is correct.
Halfway Between
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Halfway Between 21 and 727
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