$\text{a)}\frac{10}{4}=\frac{5}{2}=2\frac{1}{2}$  

$\text{b)}\frac{125}{20}=\frac{25}{4}=6\frac{1}{4}$

$\text{c)}\frac{90}{12}=\frac{30}{4}=\frac{15}{2}=7\frac{1}{2}$

$\text{d)}\frac{900}{810}=\frac{90}{81}=\frac{10}{9}=1\frac{1}{9}$

$\text{e)}\frac{750}{500}=\frac{75}{50}=\frac{15}{10}=\frac{3}{2}=1\frac{1}{2}$

$\text{f)}\frac{8000}{1500}=\frac{80}{15}=\frac{16}{3}=5\frac{1}{3}$

$\text{g)}\frac{121}{77}=\frac{11}{7}=1\frac{4}{7}$

$\text{h)}\frac{210}{36}=\frac{70}{12}=\frac{35}{6}=5\frac{5}{6}$

$\text{i)}\frac{132}{90}=\frac{44}{30}=\frac{22}{15}=1\frac{7}{15}$  

$\text{j)}\frac{192}{180}=\frac{96}{90}=\frac{48}{45}=\frac{16}{15}=1\frac{1}{15}$

$\text{k)}\frac{585}{120}=\frac{195}{40}=\frac{39}{8}=4\frac{7}{8}$   

$\text{l)}\frac{484}{24}=\frac{242}{12}=\frac{121}{6}=20\frac{1}{6}$