When you ask "What number is halfway between 72 and 115?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=72 and Y=115.
To find the number halfway between 72 and 115, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 72 and 115 into our formula, we get:
(72 + 115)/2 = 93.5
Thus, the number halfway between 72 and 115 is 93.5.
To check that our answer is correct, we subtract 72 from 93.5 and subtract 93.5 from 115 and compare the two numbers:
93.5 - 72 = 21.5
115 - 93.5 = 21.5
As you can see, the halfway number is 21.5 higher than 72 and 21.5 lower than 115. Therefore, our halfway between answer of 93.5 above is correct.
Halfway Between
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Halfway Between 72 and 116
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