$\frac{1}{3} = 0.333333.... $
$\frac{1}{3} = 0.33\frac{1}{3} $
I ran into this fraction-in-a-decimal notation in a course I'm helping somebody with. I have never seen this before, and google results simply yield "how to turn fractions to decimals" and vice-versa results.
Has anybody else seen this notation? Does anybody know what, if anything, is a standard regarding it?
More bluntly, this is being taught and I was wondering if it's legal.
Thanks.