
When you ask "What number is halfway between 12 and 138?" 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=138.

To find the number halfway between 12 and 138, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 138 into our formula, we get:
(12 + 138)/2 = 75
Thus, the number halfway between 12 and 138 is 75.
To check that our answer is correct, we subtract 12 from 75 and subtract 75 from 138 and compare the two numbers:
75 - 12 = 63
138 - 75 = 63
As you can see, the halfway number is 63 higher than 12 and 63 lower than 138. Therefore, our halfway between answer of 75 above is correct.
Halfway Between
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Halfway Between 12 and 139
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