When you ask "What number is halfway between 17 and 310?" 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=310.
To find the number halfway between 17 and 310, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 310 into our formula, we get:
(17 + 310)/2 = 163.5
Thus, the number halfway between 17 and 310 is 163.5.
To check that our answer is correct, we subtract 17 from 163.5 and subtract 163.5 from 310 and compare the two numbers:
163.5 - 17 = 146.5
310 - 163.5 = 146.5
As you can see, the halfway number is 146.5 higher than 17 and 146.5 lower than 310. Therefore, our halfway between answer of 163.5 above is correct.
Halfway Between
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Halfway Between 17 and 311
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