Hello,
[tex] \frac{8800}{1638} = \frac{2*2*2*2*2*5*5*11}{2*3*3*7*13}= \frac{4400}{819} [/tex]
[tex] \frac{1260}{1638} = \frac{2*2*3*3*5*7}{2*3*3*7*13} = \frac{10}{13} [/tex]
[tex] \frac{64}{4400} = \frac{2*2*2*2*2*2}{2*2*2*2*5*5*11} = \frac{4}{275} [/tex]
Bonne soirée,
Everteam.