Applicare la formula: $\frac{a}{b}c$$=\frac{ca}{b}$, dove $a=1$, $b=9$, $c=\frac{1}{9}$, $a/b=\frac{1}{9}$ e $ca/b=0.1111111\left(\frac{1}{9}\right)$

Applicare la formula: $ab$$=ab$, dove $ab=0.1111111\cdot 1$, $a=\frac{1}{9}$ e $b=1$

Applicare la formula: $\frac{a}{b}$$=\frac{a}{b}$, dove $a=\frac{1}{9}$, $b=9$ e $a/b=\frac{0.1111111}{9}$