When you ask "What number is halfway between 99 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=99 and Y=312.
To find the number halfway between 99 and 312, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 312 into our formula, we get:
(99 + 312)/2 = 205.5
Thus, the number halfway between 99 and 312 is 205.5.
To check that our answer is correct, we subtract 99 from 205.5 and subtract 205.5 from 312 and compare the two numbers:
205.5 - 99 = 106.5
312 - 205.5 = 106.5
As you can see, the halfway number is 106.5 higher than 99 and 106.5 lower than 312. Therefore, our halfway between answer of 205.5 above is correct.
Halfway Between
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