Halfway Between 55 and 78

When you ask "What number is halfway between 55 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=55 and Y=78.

Halfway Between Line

To find the number halfway between 55 and 78, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 55 and 78 into our formula, we get:

(55 + 78)/2 = 66.5

Thus, the number halfway between 55 and 78 is 66.5.

To check that our answer is correct, we subtract 55 from 66.5 and subtract 66.5 from 78 and compare the two numbers:

66.5 - 55 = 11.5
78 - 66.5 = 11.5

As you can see, the halfway number is 11.5 higher than 55 and 11.5 lower than 78. Therefore, our halfway between answer of 66.5 above is correct.

Halfway Between
Find halfway between two other numbers here!

Halfway Between 55 and 79
Here is our next Halfway Between calculation.