When you ask "What number is halfway between 36 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=36 and Y=129.
To find the number halfway between 36 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 36 and 129 into our formula, we get:
(36 + 129)/2 = 82.5
Thus, the number halfway between 36 and 129 is 82.5.
To check that our answer is correct, we subtract 36 from 82.5 and subtract 82.5 from 129 and compare the two numbers:
82.5 - 36 = 46.5
129 - 82.5 = 46.5
As you can see, the halfway number is 46.5 higher than 36 and 46.5 lower than 129. Therefore, our halfway between answer of 82.5 above is correct.
Halfway Between
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Halfway Between 36 and 130
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