When you ask "What number is halfway between 87 and 872?" 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=872.
To find the number halfway between 87 and 872, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 872 into our formula, we get:
(87 + 872)/2 = 479.5
Thus, the number halfway between 87 and 872 is 479.5.
To check that our answer is correct, we subtract 87 from 479.5 and subtract 479.5 from 872 and compare the two numbers:
479.5 - 87 = 392.5
872 - 479.5 = 392.5
As you can see, the halfway number is 392.5 higher than 87 and 392.5 lower than 872. Therefore, our halfway between answer of 479.5 above is correct.
Halfway Between
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Halfway Between 87 and 873
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