[tex]a) \\\\\frac9{10}=\frac{18}{20}=\frac{27}{30}=\frac{36}{40}=\frac{45}{50}=\frac{54}{60}=\frac{63}{70}=\frac{72}{80}=\frac{81}{90}=\frac{90}{100}[/tex]
[tex]b)\\\\\frac{7}{12}=\frac{14}{24}=\frac{21}{36}=\frac{28}{48}=\frac{35}{60}=\frac{42}{72}=\frac{49}{84}=\frac{56}{96}[/tex]
[tex]c)\\\\\frac{10}{25}=\frac25=\frac4{10}=\frac{6}{15}=\frac{8}{20}=\frac{10}{25}=\frac{12}{30}=\frac{14}{35}=\frac{16}{40}=\frac{18}{45}=\frac{20}{50}=\frac{22}{55}=\frac{24}{60}=\frac{26}{65}=\frac{28}{70}=\frac{30}{75}=\frac{32}{80}=\frac{34}{85}=\frac{36}{90}=\frac{38}{95}=\frac{40}{100}[/tex]
[tex]d) \\\\\frac{12}{36}=\frac13=\frac26=\frac39=\frac{4}{12}=\frac5{15}=\frac{6}{18}=\frac7{21}=\frac8{24}=\frac9{27}=\frac{10}{30}=\frac{11}{33}=\frac{13}{39}=\frac{14}{42}=\frac{15}{45}=\frac{16}{48}=\frac{17}{51}=\frac{18}{54}=\frac{19}{57}=\frac{20}{60}=\frac{21}{63}=\frac{22}{66}=\frac{23}{69}=\frac{24}{72}=\frac{25}{75}=\frac{26}{78}=\frac{27}{81}=\frac{28}{84}=\frac{29}{87}=\frac{30}{90}=\frac{31}{93}=\frac{32}{96}=\frac{33}{99}[/tex]
