Repeating decimal Memes

The eternal struggle of mathematicians who refuse to follow conventional notation. When you write 0.9 with a repeating decimal bar, it equals 1. But put that bar over the 9.0 and suddenly you're in negative territory. Mathematicians don't want you to know this one weird trick for inverting numbers. Next week: how to make your calculus professor have an aneurysm by writing limits from right to left.