When you ask "What number is halfway between 78 and 120?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=78 and Y=120.
To find the number halfway between 78 and 120, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 120 into our formula, we get:
(78 + 120)/2 = 99
Thus, the number halfway between 78 and 120 is 99.
To check that our answer is correct, we subtract 78 from 99 and subtract 99 from 120 and compare the two numbers:
99 - 78 = 21
120 - 99 = 21
As you can see, the halfway number is 21 higher than 78 and 21 lower than 120. Therefore, our halfway between answer of 99 above is correct.
Halfway Between
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Halfway Between 78 and 121
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