When you ask "What number is halfway between 80 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=80 and Y=129.
To find the number halfway between 80 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 80 and 129 into our formula, we get:
(80 + 129)/2 = 104.5
Thus, the number halfway between 80 and 129 is 104.5.
To check that our answer is correct, we subtract 80 from 104.5 and subtract 104.5 from 129 and compare the two numbers:
104.5 - 80 = 24.5
129 - 104.5 = 24.5
As you can see, the halfway number is 24.5 higher than 80 and 24.5 lower than 129. Therefore, our halfway between answer of 104.5 above is correct.
Halfway Between
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Halfway Between 80 and 130
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