The number $\displaystyle{5}\frac{{3}}{{8}}=\frac{{43}}{{8}}\usepackage{cmbright}\Huge\$ . Since it can be written as a ratio of two integers, it is a rational number. However, $\displaystyle{5}\frac{{3}}{{8}}\usepackage{cmbright}\Huge\$ is between 5 and 6 on the number line, so it cannot be a natural number. The correct answer is real and rational numbers.