When you ask "What number is halfway between 99 and 522?" 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=522.
To find the number halfway between 99 and 522, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 522 into our formula, we get:
(99 + 522)/2 = 310.5
Thus, the number halfway between 99 and 522 is 310.5.
To check that our answer is correct, we subtract 99 from 310.5 and subtract 310.5 from 522 and compare the two numbers:
310.5 - 99 = 211.5
522 - 310.5 = 211.5
As you can see, the halfway number is 211.5 higher than 99 and 211.5 lower than 522. Therefore, our halfway between answer of 310.5 above is correct.
Halfway Between
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Halfway Between 99 and 523
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