When you ask "What number is halfway between 21 and 508?" 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=508.
To find the number halfway between 21 and 508, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 508 into our formula, we get:
(21 + 508)/2 = 264.5
Thus, the number halfway between 21 and 508 is 264.5.
To check that our answer is correct, we subtract 21 from 264.5 and subtract 264.5 from 508 and compare the two numbers:
264.5 - 21 = 243.5
508 - 264.5 = 243.5
As you can see, the halfway number is 243.5 higher than 21 and 243.5 lower than 508. Therefore, our halfway between answer of 264.5 above is correct.
Halfway Between
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Halfway Between 21 and 509
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