
When you ask "What number is halfway between 78 and 477?" 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=477.

To find the number halfway between 78 and 477, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 477 into our formula, we get:
(78 + 477)/2 = 277.5
Thus, the number halfway between 78 and 477 is 277.5.
To check that our answer is correct, we subtract 78 from 277.5 and subtract 277.5 from 477 and compare the two numbers:
277.5 - 78 = 199.5
477 - 277.5 = 199.5
As you can see, the halfway number is 199.5 higher than 78 and 199.5 lower than 477. Therefore, our halfway between answer of 277.5 above is correct.
Halfway Between
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Halfway Between 78 and 478
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