When you ask "What number is halfway between 87 and 312?" 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=312.
To find the number halfway between 87 and 312, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 312 into our formula, we get:
(87 + 312)/2 = 199.5
Thus, the number halfway between 87 and 312 is 199.5.
To check that our answer is correct, we subtract 87 from 199.5 and subtract 199.5 from 312 and compare the two numbers:
199.5 - 87 = 112.5
312 - 199.5 = 112.5
As you can see, the halfway number is 112.5 higher than 87 and 112.5 lower than 312. Therefore, our halfway between answer of 199.5 above is correct.
Halfway Between
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