When you ask "What number is halfway between 17 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=17 and Y=312.
To find the number halfway between 17 and 312, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 312 into our formula, we get:
(17 + 312)/2 = 164.5
Thus, the number halfway between 17 and 312 is 164.5.
To check that our answer is correct, we subtract 17 from 164.5 and subtract 164.5 from 312 and compare the two numbers:
164.5 - 17 = 147.5
312 - 164.5 = 147.5
As you can see, the halfway number is 147.5 higher than 17 and 147.5 lower than 312. Therefore, our halfway between answer of 164.5 above is correct.
Halfway Between
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