When you ask "What number is halfway between 86 and 387?" 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=387.
To find the number halfway between 86 and 387, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 387 into our formula, we get:
(86 + 387)/2 = 236.5
Thus, the number halfway between 86 and 387 is 236.5.
To check that our answer is correct, we subtract 86 from 236.5 and subtract 236.5 from 387 and compare the two numbers:
236.5 - 86 = 150.5
387 - 236.5 = 150.5
As you can see, the halfway number is 150.5 higher than 86 and 150.5 lower than 387. Therefore, our halfway between answer of 236.5 above is correct.
Halfway Between
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Halfway Between 86 and 388
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