When you ask "What number is halfway between 15 and 90?" 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=90.
To find the number halfway between 15 and 90, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 90 into our formula, we get:
(15 + 90)/2 = 52.5
Thus, the number halfway between 15 and 90 is 52.5.
To check that our answer is correct, we subtract 15 from 52.5 and subtract 52.5 from 90 and compare the two numbers:
52.5 - 15 = 37.5
90 - 52.5 = 37.5
As you can see, the halfway number is 37.5 higher than 15 and 37.5 lower than 90. Therefore, our halfway between answer of 52.5 above is correct.
Halfway Between
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Halfway Between 15 and 91
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