a. $7\frac{9}{10} = \frac{79}{10}$; $4\frac{9}{10} = \frac{49}{10}$
=> $7\frac{9}{10}$ > $4\frac{9}{10}$;
b. $6\frac{3}{10}=\frac{63}{10}= \frac{567}{90}$, $6\frac{5}{9}=\frac{59}{9}=\frac{590}{90 }$
=>$6\frac{3}{10}$ < $6\frac{5}{9}$
a. $7\frac{9}{10} = \frac{79}{10}$; $4\frac{9}{10} = \frac{49}{10}$
=> $7\frac{9}{10}$ > $4\frac{9}{10}$;
b. $6\frac{3}{10}=\frac{63}{10}= \frac{567}{90}$, $6\frac{5}{9}=\frac{59}{9}=\frac{590}{90 }$
=>$6\frac{3}{10}$ < $6\frac{5}{9}$