When you ask "What number is halfway between 81 and 316?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=81 and Y=316.
To find the number halfway between 81 and 316, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 316 into our formula, we get:
(81 + 316)/2 = 198.5
Thus, the number halfway between 81 and 316 is 198.5.
To check that our answer is correct, we subtract 81 from 198.5 and subtract 198.5 from 316 and compare the two numbers:
198.5 - 81 = 117.5
316 - 198.5 = 117.5
As you can see, the halfway number is 117.5 higher than 81 and 117.5 lower than 316. Therefore, our halfway between answer of 198.5 above is correct.
Halfway Between
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Halfway Between 81 and 317
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