When you ask "What number is halfway between 81 and 310?" 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=310.
To find the number halfway between 81 and 310, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 310 into our formula, we get:
(81 + 310)/2 = 195.5
Thus, the number halfway between 81 and 310 is 195.5.
To check that our answer is correct, we subtract 81 from 195.5 and subtract 195.5 from 310 and compare the two numbers:
195.5 - 81 = 114.5
310 - 195.5 = 114.5
As you can see, the halfway number is 114.5 higher than 81 and 114.5 lower than 310. Therefore, our halfway between answer of 195.5 above is correct.
Halfway Between
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Halfway Between 81 and 311
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