When you ask "What number is halfway between 87 and 718?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=87 and Y=718.
To find the number halfway between 87 and 718, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 718 into our formula, we get:
(87 + 718)/2 = 402.5
Thus, the number halfway between 87 and 718 is 402.5.
To check that our answer is correct, we subtract 87 from 402.5 and subtract 402.5 from 718 and compare the two numbers:
402.5 - 87 = 315.5
718 - 402.5 = 315.5
As you can see, the halfway number is 315.5 higher than 87 and 315.5 lower than 718. Therefore, our halfway between answer of 402.5 above is correct.
Halfway Between
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Halfway Between 87 and 719
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