\(\frac{1}{4}\) because \(\frac{2}{5} , \frac{3}{10}, \frac{1}{4}\) can all be made into the LCM of 20 and turns the fractions into\(\frac{8}{20}, \frac{6}{20}, \frac{5}{20}\) respectively. This makes\(\frac{1}{4}\) the smallest of that group. That just leaves \(\frac{1}{3}, \frac{1}{4}\). By using the exact same process, you use 3 and 4's LCM of 12 and get \(\frac{4}{12}, \frac{3}{12}\). That makes \(\frac{1}{4}\) the smallest of the group.
