converting repeating decimals

28/9 = 3 1/9 is actually equal to 3.1111... .

What this problem is showing is 3.16666... , with sixes following the one that is just after the decimal point. Try your problem again, keeping in mind that the decimal value of 0.16666... is not equal to 1/9. If you figure out what the decimal value of 0.16666... is, then you should easily see why the system answer is correct.