When you ask "What number is halfway between 39 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=39 and Y=478.
To find the number halfway between 39 and 478, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 39 and 478 into our formula, we get:
(39 + 478)/2 = 258.5
Thus, the number halfway between 39 and 478 is 258.5.
To check that our answer is correct, we subtract 39 from 258.5 and subtract 258.5 from 478 and compare the two numbers:
258.5 - 39 = 219.5
478 - 258.5 = 219.5
As you can see, the halfway number is 219.5 higher than 39 and 219.5 lower than 478. Therefore, our halfway between answer of 258.5 above is correct.
Halfway Between
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Halfway Between 39 and 479
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