When you ask "What number is halfway between 87 and 522?" 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=522.
To find the number halfway between 87 and 522, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 522 into our formula, we get:
(87 + 522)/2 = 304.5
Thus, the number halfway between 87 and 522 is 304.5.
To check that our answer is correct, we subtract 87 from 304.5 and subtract 304.5 from 522 and compare the two numbers:
304.5 - 87 = 217.5
522 - 304.5 = 217.5
As you can see, the halfway number is 217.5 higher than 87 and 217.5 lower than 522. Therefore, our halfway between answer of 304.5 above is correct.
Halfway Between
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Halfway Between 87 and 523
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