When you ask "What number is halfway between 39 and 122?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=39 and Y=122.
To find the number halfway between 39 and 122, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 39 and 122 into our formula, we get:
(39 + 122)/2 = 80.5
Thus, the number halfway between 39 and 122 is 80.5.
To check that our answer is correct, we subtract 39 from 80.5 and subtract 80.5 from 122 and compare the two numbers:
80.5 - 39 = 41.5
122 - 80.5 = 41.5
As you can see, the halfway number is 41.5 higher than 39 and 41.5 lower than 122. Therefore, our halfway between answer of 80.5 above is correct.
Halfway Between
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Halfway Between 39 and 123
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