Which of the following fractions has the largest value?
(A) $\frac{8}{9}$
(B) $\frac{7}{8}$
(C) $\frac{66}{77}$
(D) $\frac{55}{66}$
(E) $\frac{4}{5}$
Using a calculator, $\frac{8}{9}=0.888 \ldots, \frac{7}{8}=0.875, \frac{66}{77}=\frac{6}{7}=0.857 \ldots, \frac{55}{66}=\frac{5}{6}=0.833 \ldots, \frac{4}{5}=0.8$, so $\frac{8}{9}=0.888 \ldots$ is the largest.

Answer: (A)