When you ask "What number is halfway between 99 and 559?" 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=559.
To find the number halfway between 99 and 559, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 559 into our formula, we get:
(99 + 559)/2 = 329
Thus, the number halfway between 99 and 559 is 329.
To check that our answer is correct, we subtract 99 from 329 and subtract 329 from 559 and compare the two numbers:
329 - 99 = 230
559 - 329 = 230
As you can see, the halfway number is 230 higher than 99 and 230 lower than 559. Therefore, our halfway between answer of 329 above is correct.
Halfway Between
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Halfway Between 99 and 560
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