When you ask "What number is halfway between 99 and 509?" 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=509.
To find the number halfway between 99 and 509, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 509 into our formula, we get:
(99 + 509)/2 = 304
Thus, the number halfway between 99 and 509 is 304.
To check that our answer is correct, we subtract 99 from 304 and subtract 304 from 509 and compare the two numbers:
304 - 99 = 205
509 - 304 = 205
As you can see, the halfway number is 205 higher than 99 and 205 lower than 509. Therefore, our halfway between answer of 304 above is correct.
Halfway Between
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Halfway Between 99 and 510
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