When you ask "What number is halfway between 99 and 418?" 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=418.
To find the number halfway between 99 and 418, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 418 into our formula, we get:
(99 + 418)/2 = 258.5
Thus, the number halfway between 99 and 418 is 258.5.
To check that our answer is correct, we subtract 99 from 258.5 and subtract 258.5 from 418 and compare the two numbers:
258.5 - 99 = 159.5
418 - 258.5 = 159.5
As you can see, the halfway number is 159.5 higher than 99 and 159.5 lower than 418. Therefore, our halfway between answer of 258.5 above is correct.
Halfway Between
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Halfway Between 99 and 419
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