Question

100/60 is exactly 1.66666666667. When I do long division my answer comes up as 1.6 with the decimal repeating, am I doing anything wrong

Answer 1

No you aren't doing anything wrong, it's just that the calculator is rounding the answer. So yes 1.6 repeating is correct

Answer 2

I don't think you are doing anything wrong. Just ignore it and write the repeating decimal. If you're asked to do it, round it up instead.