When you ask "What number is halfway between 31 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=31 and Y=310.
To find the number halfway between 31 and 310, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 310 into our formula, we get:
(31 + 310)/2 = 170.5
Thus, the number halfway between 31 and 310 is 170.5.
To check that our answer is correct, we subtract 31 from 170.5 and subtract 170.5 from 310 and compare the two numbers:
170.5 - 31 = 139.5
310 - 170.5 = 139.5
As you can see, the halfway number is 139.5 higher than 31 and 139.5 lower than 310. Therefore, our halfway between answer of 170.5 above is correct.
Halfway Between
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Halfway Between 31 and 311
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