When you ask "What number is halfway between 78 and 165?" 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=165.
To find the number halfway between 78 and 165, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 165 into our formula, we get:
(78 + 165)/2 = 121.5
Thus, the number halfway between 78 and 165 is 121.5.
To check that our answer is correct, we subtract 78 from 121.5 and subtract 121.5 from 165 and compare the two numbers:
121.5 - 78 = 43.5
165 - 121.5 = 43.5
As you can see, the halfway number is 43.5 higher than 78 and 43.5 lower than 165. Therefore, our halfway between answer of 121.5 above is correct.
Halfway Between
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Halfway Between 78 and 166
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