Calculate: 1-1/3

Expression: $1-\frac{1}{3}$

Convert $ 1 $to fraction $ :{\quad}\frac{3}{3}$

$=\frac{3}{3}-\frac{1}{3}$

Apply the fraction rule $\frac{a}{c}-\frac{b}{c}=\frac{a-b}{c}$

$=\frac{3-1}{3}$

Subtract the numbers: $ 3-1=2$

$=\frac{2}{3}$