When you ask "What number is halfway between 81 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=81 and Y=318.
To find the number halfway between 81 and 318, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 318 into our formula, we get:
(81 + 318)/2 = 199.5
Thus, the number halfway between 81 and 318 is 199.5.
To check that our answer is correct, we subtract 81 from 199.5 and subtract 199.5 from 318 and compare the two numbers:
199.5 - 81 = 118.5
318 - 199.5 = 118.5
As you can see, the halfway number is 118.5 higher than 81 and 118.5 lower than 318. Therefore, our halfway between answer of 199.5 above is correct.
Halfway Between
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Halfway Between 81 and 319
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