
When you ask "What number is halfway between 8 and 517?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=8 and Y=517.

To find the number halfway between 8 and 517, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 8 and 517 into our formula, we get:
(8 + 517)/2 = 262.5
Thus, the number halfway between 8 and 517 is 262.5.
To check that our answer is correct, we subtract 8 from 262.5 and subtract 262.5 from 517 and compare the two numbers:
262.5 - 8 = 254.5
517 - 262.5 = 254.5
As you can see, the halfway number is 254.5 higher than 8 and 254.5 lower than 517. Therefore, our halfway between answer of 262.5 above is correct.
Halfway Between
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Halfway Between 8 and 518
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