When you ask "What number is halfway between 72 and 187?" 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=187.
To find the number halfway between 72 and 187, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 72 and 187 into our formula, we get:
(72 + 187)/2 = 129.5
Thus, the number halfway between 72 and 187 is 129.5.
To check that our answer is correct, we subtract 72 from 129.5 and subtract 129.5 from 187 and compare the two numbers:
129.5 - 72 = 57.5
187 - 129.5 = 57.5
As you can see, the halfway number is 57.5 higher than 72 and 57.5 lower than 187. Therefore, our halfway between answer of 129.5 above is correct.
Halfway Between
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Halfway Between 72 and 188
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