
When you ask "What number is halfway between 20 and 78?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=20 and Y=78.

To find the number halfway between 20 and 78, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 78 into our formula, we get:
(20 + 78)/2 = 49
Thus, the number halfway between 20 and 78 is 49.
To check that our answer is correct, we subtract 20 from 49 and subtract 49 from 78 and compare the two numbers:
49 - 20 = 29
78 - 49 = 29
As you can see, the halfway number is 29 higher than 20 and 29 lower than 78. Therefore, our halfway between answer of 49 above is correct.
Halfway Between
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Halfway Between 20 and 79
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