When you ask "What number is halfway between 9 and 317?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=9 and Y=317.
To find the number halfway between 9 and 317, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 317 into our formula, we get:
(9 + 317)/2 = 163
Thus, the number halfway between 9 and 317 is 163.
To check that our answer is correct, we subtract 9 from 163 and subtract 163 from 317 and compare the two numbers:
163 - 9 = 154
317 - 163 = 154
As you can see, the halfway number is 154 higher than 9 and 154 lower than 317. Therefore, our halfway between answer of 163 above is correct.
Halfway Between
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Halfway Between 9 and 318
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