When you ask "What number is halfway between 15 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=15 and Y=312.
To find the number halfway between 15 and 312, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 312 into our formula, we get:
(15 + 312)/2 = 163.5
Thus, the number halfway between 15 and 312 is 163.5.
To check that our answer is correct, we subtract 15 from 163.5 and subtract 163.5 from 312 and compare the two numbers:
163.5 - 15 = 148.5
312 - 163.5 = 148.5
As you can see, the halfway number is 148.5 higher than 15 and 148.5 lower than 312. Therefore, our halfway between answer of 163.5 above is correct.
Halfway Between
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