
When you ask "What number is halfway between 12 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=12 and Y=122.

To find the number halfway between 12 and 122, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 122 into our formula, we get:
(12 + 122)/2 = 67
Thus, the number halfway between 12 and 122 is 67.
To check that our answer is correct, we subtract 12 from 67 and subtract 67 from 122 and compare the two numbers:
67 - 12 = 55
122 - 67 = 55
As you can see, the halfway number is 55 higher than 12 and 55 lower than 122. Therefore, our halfway between answer of 67 above is correct.
Halfway Between
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Halfway Between 12 and 123
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