Represent the following rational numbers on the number line:

$\frac{21}{4}$

Which of the following represent the same number on the number line?

$\frac{4}{7}$ and $\frac{-4}{7}$

Which of the following represent the same number on the number line?

$\frac{0}{4}$ and $\frac{0}{3}$

Which of the following represent the same number on the number line?

$\frac{18}{-3}$and $\frac{-3}{18}$

Which of the following represent the same number on the number line?

$\frac{-1}{2}$ and $\frac{5}{-10}$

Which of the following represent the same number on the number line?

$\frac{-4}{5}$ and $\frac{-5}{20}$

Which of the following represent the same number on the number line?

$\frac{3}{-5}$ and $\frac{9}{-15}$

Which rational number in each of the following pairs is greater?

$\frac{3}{7}, 0$

Which rational number in each of the following pairs is greater?

$\frac{-3}{7}, 0$