When you ask "What number is halfway between 9 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=9 and Y=129.
To find the number halfway between 9 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 129 into our formula, we get:
(9 + 129)/2 = 69
Thus, the number halfway between 9 and 129 is 69.
To check that our answer is correct, we subtract 9 from 69 and subtract 69 from 129 and compare the two numbers:
69 - 9 = 60
129 - 69 = 60
As you can see, the halfway number is 60 higher than 9 and 60 lower than 129. Therefore, our halfway between answer of 69 above is correct.
Halfway Between
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Halfway Between 9 and 130
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