
When you ask "What number is halfway between 99 and 240?" 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=240.

To find the number halfway between 99 and 240, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 240 into our formula, we get:
(99 + 240)/2 = 169.5
Thus, the number halfway between 99 and 240 is 169.5.
To check that our answer is correct, we subtract 99 from 169.5 and subtract 169.5 from 240 and compare the two numbers:
169.5 - 99 = 70.5
240 - 169.5 = 70.5
As you can see, the halfway number is 70.5 higher than 99 and 70.5 lower than 240. Therefore, our halfway between answer of 169.5 above is correct.
Halfway Between
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Halfway Between 99 and 241
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