When you ask "What number is halfway between 99 and 580?" 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=580.
To find the number halfway between 99 and 580, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 580 into our formula, we get:
(99 + 580)/2 = 339.5
Thus, the number halfway between 99 and 580 is 339.5.
To check that our answer is correct, we subtract 99 from 339.5 and subtract 339.5 from 580 and compare the two numbers:
339.5 - 99 = 240.5
580 - 339.5 = 240.5
As you can see, the halfway number is 240.5 higher than 99 and 240.5 lower than 580. Therefore, our halfway between answer of 339.5 above is correct.
Halfway Between
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Halfway Between 99 and 581
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