ژمارەی ڕێژەیی

${\displaystyle \mathbb {Q} =\left\{\left.{\frac {m}{n}}\right|(m,n)\in \mathbb {Z} \times (\mathbb {Z} \setminus \{0\})\right\}}$

${\displaystyle {\frac {5}{11}}={\frac {5*7}{11*7}}={\frac {35}{77}}}$  , ${\displaystyle {\frac {3}{7}}={\frac {3*11}{7*11}}={\frac {33}{77}}}$  

${\displaystyle {\frac {35}{77}}>{\frac {33}{77}}}$  واتە ${\displaystyle {\frac {5}{11}}>{\frac {3}{7}}}$ 

${\displaystyle {\frac {a}{b}}+{\frac {c}{d}}={\frac {ad+/-bc}{bd}}.}$ 

${\displaystyle {\frac {4}{3}}+{\frac {2}{5}}={\frac {20+6}{15}}={\frac {26}{15}}}$ 

${\displaystyle {\frac {5}{6}}-{\frac {5}{4}}={\frac {20-30}{24}}={\frac {-10}{24}}}$ 

${\displaystyle {\frac {a}{b}}\cdot {\frac {c}{d}}={\frac {ac}{bd}}.}$ 

${\displaystyle {\frac {a}{b}}\div {\frac {c}{d}}={\frac {ad}{bc}}.}$ 

${\displaystyle {\frac {2}{5}}\cdot {\frac {14}{35}}={\frac {2\cdot 14}{5\cdot 35}}={\frac {28}{175}}}$ 

${\displaystyle {\frac {5}{7}}\div {\frac {3}{5}}={\frac {5\cdot 5}{7\cdot 3}}={\frac {25}{21}}}$