When you ask "What number is halfway between 78 and 239?" 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=239.
To find the number halfway between 78 and 239, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 239 into our formula, we get:
(78 + 239)/2 = 158.5
Thus, the number halfway between 78 and 239 is 158.5.
To check that our answer is correct, we subtract 78 from 158.5 and subtract 158.5 from 239 and compare the two numbers:
158.5 - 78 = 80.5
239 - 158.5 = 80.5
As you can see, the halfway number is 80.5 higher than 78 and 80.5 lower than 239. Therefore, our halfway between answer of 158.5 above is correct.
Halfway Between
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Halfway Between 78 and 240
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