When you ask "What number is halfway between 78 and 179?" 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=179.
To find the number halfway between 78 and 179, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 179 into our formula, we get:
(78 + 179)/2 = 128.5
Thus, the number halfway between 78 and 179 is 128.5.
To check that our answer is correct, we subtract 78 from 128.5 and subtract 128.5 from 179 and compare the two numbers:
128.5 - 78 = 50.5
179 - 128.5 = 50.5
As you can see, the halfway number is 50.5 higher than 78 and 50.5 lower than 179. Therefore, our halfway between answer of 128.5 above is correct.
Halfway Between
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Halfway Between 78 and 180
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