When you ask "What number is halfway between 99 and 124?" 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=124.
To find the number halfway between 99 and 124, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 124 into our formula, we get:
(99 + 124)/2 = 111.5
Thus, the number halfway between 99 and 124 is 111.5.
To check that our answer is correct, we subtract 99 from 111.5 and subtract 111.5 from 124 and compare the two numbers:
111.5 - 99 = 12.5
124 - 111.5 = 12.5
As you can see, the halfway number is 12.5 higher than 99 and 12.5 lower than 124. Therefore, our halfway between answer of 111.5 above is correct.
Halfway Between
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Halfway Between 99 and 125
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