
When you ask "What number is halfway between 78 and 330?" 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=330.

To find the number halfway between 78 and 330, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 330 into our formula, we get:
(78 + 330)/2 = 204
Thus, the number halfway between 78 and 330 is 204.
To check that our answer is correct, we subtract 78 from 204 and subtract 204 from 330 and compare the two numbers:
204 - 78 = 126
330 - 204 = 126
As you can see, the halfway number is 126 higher than 78 and 126 lower than 330. Therefore, our halfway between answer of 204 above is correct.
Halfway Between
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Halfway Between 78 and 331
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