When you ask "What number is halfway between 8 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=8 and Y=391.
To find the number halfway between 8 and 391, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 8 and 391 into our formula, we get:
(8 + 391)/2 = 199.5
Thus, the number halfway between 8 and 391 is 199.5.
To check that our answer is correct, we subtract 8 from 199.5 and subtract 199.5 from 391 and compare the two numbers:
199.5 - 8 = 191.5
391 - 199.5 = 191.5
As you can see, the halfway number is 191.5 higher than 8 and 191.5 lower than 391. Therefore, our halfway between answer of 199.5 above is correct.
Halfway Between
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Halfway Between 8 and 392
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