When you ask "What number is halfway between 72 and 207?" 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=207.
To find the number halfway between 72 and 207, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 72 and 207 into our formula, we get:
(72 + 207)/2 = 139.5
Thus, the number halfway between 72 and 207 is 139.5.
To check that our answer is correct, we subtract 72 from 139.5 and subtract 139.5 from 207 and compare the two numbers:
139.5 - 72 = 67.5
207 - 139.5 = 67.5
As you can see, the halfway number is 67.5 higher than 72 and 67.5 lower than 207. Therefore, our halfway between answer of 139.5 above is correct.
Halfway Between
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Halfway Between 72 and 208
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