When you ask "What number is halfway between 17 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=17 and Y=478.
To find the number halfway between 17 and 478, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 478 into our formula, we get:
(17 + 478)/2 = 247.5
Thus, the number halfway between 17 and 478 is 247.5.
To check that our answer is correct, we subtract 17 from 247.5 and subtract 247.5 from 478 and compare the two numbers:
247.5 - 17 = 230.5
478 - 247.5 = 230.5
As you can see, the halfway number is 230.5 higher than 17 and 230.5 lower than 478. Therefore, our halfway between answer of 247.5 above is correct.
Halfway Between
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Halfway Between 17 and 479
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