When you ask "What number is halfway between 87 and 724?" 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=724.
To find the number halfway between 87 and 724, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 724 into our formula, we get:
(87 + 724)/2 = 405.5
Thus, the number halfway between 87 and 724 is 405.5.
To check that our answer is correct, we subtract 87 from 405.5 and subtract 405.5 from 724 and compare the two numbers:
405.5 - 87 = 318.5
724 - 405.5 = 318.5
As you can see, the halfway number is 318.5 higher than 87 and 318.5 lower than 724. Therefore, our halfway between answer of 405.5 above is correct.
Halfway Between
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Halfway Between 87 and 725
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