When you ask "What number is halfway between 15 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=15 and Y=508.
To find the number halfway between 15 and 508, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 508 into our formula, we get:
(15 + 508)/2 = 261.5
Thus, the number halfway between 15 and 508 is 261.5.
To check that our answer is correct, we subtract 15 from 261.5 and subtract 261.5 from 508 and compare the two numbers:
261.5 - 15 = 246.5
508 - 261.5 = 246.5
As you can see, the halfway number is 246.5 higher than 15 and 246.5 lower than 508. Therefore, our halfway between answer of 261.5 above is correct.
Halfway Between
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Halfway Between 15 and 509
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