Question

What is the decimal equivalent of 3/9?

Answer 1

$\dfrac{3}{9}=\dfrac{3:3}{9:3}=\dfrac{1}{3}=0.3333...=0.\overline{3}\to B.$

for the future:

$\dfrac{1}{9}=0.\overline{1}\\\\\dfrac{2}{9}=0.\overline{2}\\\\\dfrac{3}{9}=0.\overline{3}\\\vdots\\\\\dfrac{n}{9}=0.\overline{n}\ for\ n\in\{1;\ 2;\ 3;\ ...;\ 9\}$