When you ask "What number is halfway between 81 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=81 and Y=312.
To find the number halfway between 81 and 312, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 312 into our formula, we get:
(81 + 312)/2 = 196.5
Thus, the number halfway between 81 and 312 is 196.5.
To check that our answer is correct, we subtract 81 from 196.5 and subtract 196.5 from 312 and compare the two numbers:
196.5 - 81 = 115.5
312 - 196.5 = 115.5
As you can see, the halfway number is 115.5 higher than 81 and 115.5 lower than 312. Therefore, our halfway between answer of 196.5 above is correct.
Halfway Between
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