The largest fraction in the set $\left\{\frac{1}{2}, \frac{1}{3}, \frac{1}{4}, \frac{1}{5}, \frac{1}{10}\right\}$ is
(A) $\frac{1}{2}$
(B) $\frac{1}{3}$
(C) $\frac{1}{4}$
(D) $\frac{1}{5}$
(E) $\frac{1}{10}$
A positive fraction increases in value as its numerator increases and also increases in value as its denominator decreases.

Since the numerators of all five fractions are equal, then the largest of these is the fraction with the smallest denominator.

The largest fraction in the set $\left\{\frac{1}{2}, \frac{1}{3}, \frac{1}{4}, \frac{1}{5}, \frac{1}{10}\right\}$ is $\frac{1}{2}$.

ANSWER: (A)