When you ask "What number is halfway between 86 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=86 and Y=139.
To find the number halfway between 86 and 139, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 139 into our formula, we get:
(86 + 139)/2 = 112.5
Thus, the number halfway between 86 and 139 is 112.5.
To check that our answer is correct, we subtract 86 from 112.5 and subtract 112.5 from 139 and compare the two numbers:
112.5 - 86 = 26.5
139 - 112.5 = 26.5
As you can see, the halfway number is 26.5 higher than 86 and 26.5 lower than 139. Therefore, our halfway between answer of 112.5 above is correct.
Halfway Between
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Halfway Between 86 and 140
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