When you ask "What number is halfway between 87 and 728?" 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=728.
To find the number halfway between 87 and 728, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 728 into our formula, we get:
(87 + 728)/2 = 407.5
Thus, the number halfway between 87 and 728 is 407.5.
To check that our answer is correct, we subtract 87 from 407.5 and subtract 407.5 from 728 and compare the two numbers:
407.5 - 87 = 320.5
728 - 407.5 = 320.5
As you can see, the halfway number is 320.5 higher than 87 and 320.5 lower than 728. Therefore, our halfway between answer of 407.5 above is correct.
Halfway Between
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Halfway Between 87 and 729
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