When you ask "What number is halfway between 99 and 129?" 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=129.
To find the number halfway between 99 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 129 into our formula, we get:
(99 + 129)/2 = 114
Thus, the number halfway between 99 and 129 is 114.
To check that our answer is correct, we subtract 99 from 114 and subtract 114 from 129 and compare the two numbers:
114 - 99 = 15
129 - 114 = 15
As you can see, the halfway number is 15 higher than 99 and 15 lower than 129. Therefore, our halfway between answer of 114 above is correct.
Halfway Between
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Halfway Between 99 and 130
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