When you ask "What number is halfway between 25 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=25 and Y=312.
To find the number halfway between 25 and 312, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 312 into our formula, we get:
(25 + 312)/2 = 168.5
Thus, the number halfway between 25 and 312 is 168.5.
To check that our answer is correct, we subtract 25 from 168.5 and subtract 168.5 from 312 and compare the two numbers:
168.5 - 25 = 143.5
312 - 168.5 = 143.5
As you can see, the halfway number is 143.5 higher than 25 and 143.5 lower than 312. Therefore, our halfway between answer of 168.5 above is correct.
Halfway Between
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