When you ask "What number is halfway between 82 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=82 and Y=129.
To find the number halfway between 82 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 82 and 129 into our formula, we get:
(82 + 129)/2 = 105.5
Thus, the number halfway between 82 and 129 is 105.5.
To check that our answer is correct, we subtract 82 from 105.5 and subtract 105.5 from 129 and compare the two numbers:
105.5 - 82 = 23.5
129 - 105.5 = 23.5
As you can see, the halfway number is 23.5 higher than 82 and 23.5 lower than 129. Therefore, our halfway between answer of 105.5 above is correct.
Halfway Between
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Halfway Between 82 and 130
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