When you ask "What number is halfway between 99 and 520?" 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=520.
To find the number halfway between 99 and 520, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 520 into our formula, we get:
(99 + 520)/2 = 309.5
Thus, the number halfway between 99 and 520 is 309.5.
To check that our answer is correct, we subtract 99 from 309.5 and subtract 309.5 from 520 and compare the two numbers:
309.5 - 99 = 210.5
520 - 309.5 = 210.5
As you can see, the halfway number is 210.5 higher than 99 and 210.5 lower than 520. Therefore, our halfway between answer of 309.5 above is correct.
Halfway Between
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Halfway Between 99 and 521
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