When you ask "What number is halfway between 21 and 634?" 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=634.
To find the number halfway between 21 and 634, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 634 into our formula, we get:
(21 + 634)/2 = 327.5
Thus, the number halfway between 21 and 634 is 327.5.
To check that our answer is correct, we subtract 21 from 327.5 and subtract 327.5 from 634 and compare the two numbers:
327.5 - 21 = 306.5
634 - 327.5 = 306.5
As you can see, the halfway number is 306.5 higher than 21 and 306.5 lower than 634. Therefore, our halfway between answer of 327.5 above is correct.
Halfway Between
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Halfway Between 21 and 635
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