
When you ask "What number is halfway between 17 and 324?" 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=324.

To find the number halfway between 17 and 324, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 324 into our formula, we get:
(17 + 324)/2 = 170.5
Thus, the number halfway between 17 and 324 is 170.5.
To check that our answer is correct, we subtract 17 from 170.5 and subtract 170.5 from 324 and compare the two numbers:
170.5 - 17 = 153.5
324 - 170.5 = 153.5
As you can see, the halfway number is 153.5 higher than 17 and 153.5 lower than 324. Therefore, our halfway between answer of 170.5 above is correct.
Halfway Between
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Halfway Between 17 and 325
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