When you ask "What number is halfway between 87 and 315?" 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=315.
To find the number halfway between 87 and 315, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 315 into our formula, we get:
(87 + 315)/2 = 201
Thus, the number halfway between 87 and 315 is 201.
To check that our answer is correct, we subtract 87 from 201 and subtract 201 from 315 and compare the two numbers:
201 - 87 = 114
315 - 201 = 114
As you can see, the halfway number is 114 higher than 87 and 114 lower than 315. Therefore, our halfway between answer of 201 above is correct.
Halfway Between
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Halfway Between 87 and 316
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