When you ask "What number is halfway between 78 and 97?" 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=97.
To find the number halfway between 78 and 97, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 97 into our formula, we get:
(78 + 97)/2 = 87.5
Thus, the number halfway between 78 and 97 is 87.5.
To check that our answer is correct, we subtract 78 from 87.5 and subtract 87.5 from 97 and compare the two numbers:
87.5 - 78 = 9.5
97 - 87.5 = 9.5
As you can see, the halfway number is 9.5 higher than 78 and 9.5 lower than 97. Therefore, our halfway between answer of 87.5 above is correct.
Halfway Between
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