Step 1: Create the problem. 3 is a whole number, so the denominator is 1. When created, the problem would be 3/1 * 5/2.
Step 2: Multiply straight across. In other words, mulitply the numerators together and the denominators together. 3 * 5 is 15. 2 * 1 is 2. 15/2 is the product of the problem.