When you ask "What number is halfway between 72 and 215?" 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=215.
To find the number halfway between 72 and 215, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 72 and 215 into our formula, we get:
(72 + 215)/2 = 143.5
Thus, the number halfway between 72 and 215 is 143.5.
To check that our answer is correct, we subtract 72 from 143.5 and subtract 143.5 from 215 and compare the two numbers:
143.5 - 72 = 71.5
215 - 143.5 = 71.5
As you can see, the halfway number is 71.5 higher than 72 and 71.5 lower than 215. Therefore, our halfway between answer of 143.5 above is correct.
Halfway Between
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