When you ask "What number is halfway between 87 and 259?" 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=259.
To find the number halfway between 87 and 259, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 259 into our formula, we get:
(87 + 259)/2 = 173
Thus, the number halfway between 87 and 259 is 173.
To check that our answer is correct, we subtract 87 from 173 and subtract 173 from 259 and compare the two numbers:
173 - 87 = 86
259 - 173 = 86
As you can see, the halfway number is 86 higher than 87 and 86 lower than 259. Therefore, our halfway between answer of 173 above is correct.
Halfway Between
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Halfway Between 87 and 260
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