When you ask "What number is halfway between 87 and 258?" 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=258.
To find the number halfway between 87 and 258, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 258 into our formula, we get:
(87 + 258)/2 = 172.5
Thus, the number halfway between 87 and 258 is 172.5.
To check that our answer is correct, we subtract 87 from 172.5 and subtract 172.5 from 258 and compare the two numbers:
172.5 - 87 = 85.5
258 - 172.5 = 85.5
As you can see, the halfway number is 85.5 higher than 87 and 85.5 lower than 258. Therefore, our halfway between answer of 172.5 above is correct.
Halfway Between
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Halfway Between 87 and 259
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