When you ask "What number is halfway between 87 and 518?" 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=518.
To find the number halfway between 87 and 518, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 518 into our formula, we get:
(87 + 518)/2 = 302.5
Thus, the number halfway between 87 and 518 is 302.5.
To check that our answer is correct, we subtract 87 from 302.5 and subtract 302.5 from 518 and compare the two numbers:
302.5 - 87 = 215.5
518 - 302.5 = 215.5
As you can see, the halfway number is 215.5 higher than 87 and 215.5 lower than 518. Therefore, our halfway between answer of 302.5 above is correct.
Halfway Between
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Halfway Between 87 and 519
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