When you ask "What number is halfway between 17 and 578?" 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=578.
To find the number halfway between 17 and 578, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 578 into our formula, we get:
(17 + 578)/2 = 297.5
Thus, the number halfway between 17 and 578 is 297.5.
To check that our answer is correct, we subtract 17 from 297.5 and subtract 297.5 from 578 and compare the two numbers:
297.5 - 17 = 280.5
578 - 297.5 = 280.5
As you can see, the halfway number is 280.5 higher than 17 and 280.5 lower than 578. Therefore, our halfway between answer of 297.5 above is correct.
Halfway Between
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Halfway Between 17 and 579
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