When you ask "What number is halfway between 15 and 99?" 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=99.
To find the number halfway between 15 and 99, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 99 into our formula, we get:
(15 + 99)/2 = 57
Thus, the number halfway between 15 and 99 is 57.
To check that our answer is correct, we subtract 15 from 57 and subtract 57 from 99 and compare the two numbers:
57 - 15 = 42
99 - 57 = 42
As you can see, the halfway number is 42 higher than 15 and 42 lower than 99. Therefore, our halfway between answer of 57 above is correct.
Halfway Between
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Halfway Between 15 and 100
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