When you ask "What number is halfway between 86 and 355?" 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=355.
To find the number halfway between 86 and 355, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 355 into our formula, we get:
(86 + 355)/2 = 220.5
Thus, the number halfway between 86 and 355 is 220.5.
To check that our answer is correct, we subtract 86 from 220.5 and subtract 220.5 from 355 and compare the two numbers:
220.5 - 86 = 134.5
355 - 220.5 = 134.5
As you can see, the halfway number is 134.5 higher than 86 and 134.5 lower than 355. Therefore, our halfway between answer of 220.5 above is correct.
Halfway Between
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Halfway Between 86 and 356
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