When you ask "What number is halfway between 31 and 312?" 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=312.
To find the number halfway between 31 and 312, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 312 into our formula, we get:
(31 + 312)/2 = 171.5
Thus, the number halfway between 31 and 312 is 171.5.
To check that our answer is correct, we subtract 31 from 171.5 and subtract 171.5 from 312 and compare the two numbers:
171.5 - 31 = 140.5
312 - 171.5 = 140.5
As you can see, the halfway number is 140.5 higher than 31 and 140.5 lower than 312. Therefore, our halfway between answer of 171.5 above is correct.
Halfway Between
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Halfway Between 31 and 313
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