take lcm of 40 , 16 ,8 , 80 = 80
convert denominator of every fraction to 80
$$\frac{31}{40}$$ = $$\frac{62}{80}$$
$$\frac{13}{16}$$ = $$\frac{65}{80}$$
$$\frac{7}{8}$$ = $$\frac{70}{80}$$
$$\frac{63}{80}$$ = $$\frac{63}{80}$$
so largest fraction is $$\frac{70}{80}$$ or $$\frac{7}{8}$$
Create a FREE account and get: