When you ask "What number is halfway between 86 and 393?" 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=393.
To find the number halfway between 86 and 393, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 393 into our formula, we get:
(86 + 393)/2 = 239.5
Thus, the number halfway between 86 and 393 is 239.5.
To check that our answer is correct, we subtract 86 from 239.5 and subtract 239.5 from 393 and compare the two numbers:
239.5 - 86 = 153.5
393 - 239.5 = 153.5
As you can see, the halfway number is 153.5 higher than 86 and 153.5 lower than 393. Therefore, our halfway between answer of 239.5 above is correct.
Halfway Between
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Halfway Between 86 and 394
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