
When you ask "What number is halfway between 99 and 501?" 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=501.

To find the number halfway between 99 and 501, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 501 into our formula, we get:
(99 + 501)/2 = 300
Thus, the number halfway between 99 and 501 is 300.
To check that our answer is correct, we subtract 99 from 300 and subtract 300 from 501 and compare the two numbers:
300 - 99 = 201
501 - 300 = 201
As you can see, the halfway number is 201 higher than 99 and 201 lower than 501. Therefore, our halfway between answer of 300 above is correct.
Halfway Between
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Halfway Between 99 and 502
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