When you ask "What number is halfway between 86 and 159?" 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=159.
To find the number halfway between 86 and 159, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 159 into our formula, we get:
(86 + 159)/2 = 122.5
Thus, the number halfway between 86 and 159 is 122.5.
To check that our answer is correct, we subtract 86 from 122.5 and subtract 122.5 from 159 and compare the two numbers:
122.5 - 86 = 36.5
159 - 122.5 = 36.5
As you can see, the halfway number is 36.5 higher than 86 and 36.5 lower than 159. Therefore, our halfway between answer of 122.5 above is correct.
Halfway Between
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Halfway Between 86 and 160
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