When you ask "What number is halfway between 91 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=91 and Y=312.
To find the number halfway between 91 and 312, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 91 and 312 into our formula, we get:
(91 + 312)/2 = 201.5
Thus, the number halfway between 91 and 312 is 201.5.
To check that our answer is correct, we subtract 91 from 201.5 and subtract 201.5 from 312 and compare the two numbers:
201.5 - 91 = 110.5
312 - 201.5 = 110.5
As you can see, the halfway number is 110.5 higher than 91 and 110.5 lower than 312. Therefore, our halfway between answer of 201.5 above is correct.
Halfway Between
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