When you ask "What number is halfway between 86 and 391?" 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=391.
To find the number halfway between 86 and 391, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 391 into our formula, we get:
(86 + 391)/2 = 238.5
Thus, the number halfway between 86 and 391 is 238.5.
To check that our answer is correct, we subtract 86 from 238.5 and subtract 238.5 from 391 and compare the two numbers:
238.5 - 86 = 152.5
391 - 238.5 = 152.5
As you can see, the halfway number is 152.5 higher than 86 and 152.5 lower than 391. Therefore, our halfway between answer of 238.5 above is correct.
Halfway Between
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Halfway Between 86 and 392
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