The fraction which is not equal to $\dfrac{4}{5}$ is

1. $\dfrac{40}{50}$

2. $\dfrac{9}{15}$

3. $\dfrac{12}{15}$

4. $\dfrac{32}{40}$

Which of the following fractions is not in the simplest form?

1. $\dfrac{27}{28}$

2. $\dfrac{13}{33}$

3. $\dfrac{39}{87}$

4. $\dfrac{14}{9}$

Which of the following fractions is the greatest?

1. $\dfrac{5}{6}$

2. $\dfrac{5}{7}$

3. $\dfrac{5}{8}$

4. $\dfrac{5}{9}$

Which of the following fractions is the smallest?

1. $\dfrac{11}{7}$

2. $\dfrac{11}{9}$

3. $\dfrac{11}{10}$

4. $\dfrac{11}{6}$