When you ask "What number is halfway between 86 and 318?" 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=318.
To find the number halfway between 86 and 318, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 318 into our formula, we get:
(86 + 318)/2 = 202
Thus, the number halfway between 86 and 318 is 202.
To check that our answer is correct, we subtract 86 from 202 and subtract 202 from 318 and compare the two numbers:
202 - 86 = 116
318 - 202 = 116
As you can see, the halfway number is 116 higher than 86 and 116 lower than 318. Therefore, our halfway between answer of 202 above is correct.
Halfway Between
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Halfway Between 86 and 319
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