When you ask "What number is halfway between 21 and 764?" 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=764.
To find the number halfway between 21 and 764, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 764 into our formula, we get:
(21 + 764)/2 = 392.5
Thus, the number halfway between 21 and 764 is 392.5.
To check that our answer is correct, we subtract 21 from 392.5 and subtract 392.5 from 764 and compare the two numbers:
392.5 - 21 = 371.5
764 - 392.5 = 371.5
As you can see, the halfway number is 371.5 higher than 21 and 371.5 lower than 764. Therefore, our halfway between answer of 392.5 above is correct.
Halfway Between
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Halfway Between 21 and 765
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