When you ask "What number is halfway between 99 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=99 and Y=517.
To find the number halfway between 99 and 517, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 517 into our formula, we get:
(99 + 517)/2 = 308
Thus, the number halfway between 99 and 517 is 308.
To check that our answer is correct, we subtract 99 from 308 and subtract 308 from 517 and compare the two numbers:
308 - 99 = 209
517 - 308 = 209
As you can see, the halfway number is 209 higher than 99 and 209 lower than 517. Therefore, our halfway between answer of 308 above is correct.
Halfway Between
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Halfway Between 99 and 518
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