When you ask "What number is halfway between 15 and 72?" 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=72.
To find the number halfway between 15 and 72, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 72 into our formula, we get:
(15 + 72)/2 = 43.5
Thus, the number halfway between 15 and 72 is 43.5.
To check that our answer is correct, we subtract 15 from 43.5 and subtract 43.5 from 72 and compare the two numbers:
43.5 - 15 = 28.5
72 - 43.5 = 28.5
As you can see, the halfway number is 28.5 higher than 15 and 28.5 lower than 72. Therefore, our halfway between answer of 43.5 above is correct.
Halfway Between
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Halfway Between 15 and 73
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