You can make 5 into a fraction, 5/1, meaning there are 5 whole numbers, or simply just 5. You can use the unit fraction 1/3 to represent the 3 being the denominator.
When you mulitply fractions, you multiply straight across.
[tex] \frac{5}{1} * \frac{1}{3} = \frac{5}{3} [/tex]
