When you ask "What number is halfway between 87 and 139?" 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=139.
To find the number halfway between 87 and 139, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 139 into our formula, we get:
(87 + 139)/2 = 113
Thus, the number halfway between 87 and 139 is 113.
To check that our answer is correct, we subtract 87 from 113 and subtract 113 from 139 and compare the two numbers:
113 - 87 = 26
139 - 113 = 26
As you can see, the halfway number is 26 higher than 87 and 26 lower than 139. Therefore, our halfway between answer of 113 above is correct.
Halfway Between
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Halfway Between 87 and 140
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