
When you ask "What number is halfway between 43 and 478?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=43 and Y=478.

To find the number halfway between 43 and 478, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 43 and 478 into our formula, we get:
(43 + 478)/2 = 260.5
Thus, the number halfway between 43 and 478 is 260.5.
To check that our answer is correct, we subtract 43 from 260.5 and subtract 260.5 from 478 and compare the two numbers:
260.5 - 43 = 217.5
478 - 260.5 = 217.5
As you can see, the halfway number is 217.5 higher than 43 and 217.5 lower than 478. Therefore, our halfway between answer of 260.5 above is correct.
Halfway Between
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Halfway Between 43 and 479
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