
When you ask "What number is halfway between 99 and 566?" 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=566.

To find the number halfway between 99 and 566, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 566 into our formula, we get:
(99 + 566)/2 = 332.5
Thus, the number halfway between 99 and 566 is 332.5.
To check that our answer is correct, we subtract 99 from 332.5 and subtract 332.5 from 566 and compare the two numbers:
332.5 - 99 = 233.5
566 - 332.5 = 233.5
As you can see, the halfway number is 233.5 higher than 99 and 233.5 lower than 566. Therefore, our halfway between answer of 332.5 above is correct.
Halfway Between
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