When you ask "What number is halfway between 7 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=7 and Y=78.
To find the number halfway between 7 and 78, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 78 into our formula, we get:
(7 + 78)/2 = 42.5
Thus, the number halfway between 7 and 78 is 42.5.
To check that our answer is correct, we subtract 7 from 42.5 and subtract 42.5 from 78 and compare the two numbers:
42.5 - 7 = 35.5
78 - 42.5 = 35.5
As you can see, the halfway number is 35.5 higher than 7 and 35.5 lower than 78. Therefore, our halfway between answer of 42.5 above is correct.
Halfway Between
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Halfway Between 7 and 79
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