When you ask "What number is halfway between 86 and 137?" 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=137.
To find the number halfway between 86 and 137, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 137 into our formula, we get:
(86 + 137)/2 = 111.5
Thus, the number halfway between 86 and 137 is 111.5.
To check that our answer is correct, we subtract 86 from 111.5 and subtract 111.5 from 137 and compare the two numbers:
111.5 - 86 = 25.5
137 - 111.5 = 25.5
As you can see, the halfway number is 25.5 higher than 86 and 25.5 lower than 137. Therefore, our halfway between answer of 111.5 above is correct.
Halfway Between
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Halfway Between 86 and 138
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