When you ask "What number is halfway between 9 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=9 and Y=78.
To find the number halfway between 9 and 78, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 78 into our formula, we get:
(9 + 78)/2 = 43.5
Thus, the number halfway between 9 and 78 is 43.5.
To check that our answer is correct, we subtract 9 from 43.5 and subtract 43.5 from 78 and compare the two numbers:
43.5 - 9 = 34.5
78 - 43.5 = 34.5
As you can see, the halfway number is 34.5 higher than 9 and 34.5 lower than 78. Therefore, our halfway between answer of 43.5 above is correct.
Halfway Between
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Halfway Between 9 and 79
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