When you ask "What number is halfway between 99 and 511?" 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=511.
To find the number halfway between 99 and 511, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 511 into our formula, we get:
(99 + 511)/2 = 305
Thus, the number halfway between 99 and 511 is 305.
To check that our answer is correct, we subtract 99 from 305 and subtract 305 from 511 and compare the two numbers:
305 - 99 = 206
511 - 305 = 206
As you can see, the halfway number is 206 higher than 99 and 206 lower than 511. Therefore, our halfway between answer of 305 above is correct.
Halfway Between
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Halfway Between 99 and 512
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