When you ask "What number is halfway between 15 and 81?" 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=81.
To find the number halfway between 15 and 81, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 81 into our formula, we get:
(15 + 81)/2 = 48
Thus, the number halfway between 15 and 81 is 48.
To check that our answer is correct, we subtract 15 from 48 and subtract 48 from 81 and compare the two numbers:
48 - 15 = 33
81 - 48 = 33
As you can see, the halfway number is 33 higher than 15 and 33 lower than 81. Therefore, our halfway between answer of 48 above is correct.
Halfway Between
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Halfway Between 15 and 82
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