You may rewrite $\displaystyle{5.3}={5.30}\usepackage{cmbright}\Huge\$ . Now compare the digits of 5.30 and 5.38. The digits in the ones and tenths place are the same. Comparing the digits in the hundredths place, $\displaystyle{8}>{0}\usepackage{cmbright}\Huge\$ . Therefore, $\displaystyle{5.38}>{5.3}\usepackage{cmbright}\Huge\$ . Remember that > means "greater than."