When multiplying fractions you just multiply the numerators together: 3X5 = 15
Then you multiply the denominators together: 10X12 = 120
So 15/120. Now simplify Divide both by 15 1/8
I chose 15 because I knew that off the top of my head. If you didn't know that start with what you do know. For example
15/120 - you can divide by 5 3/24 - you can divide by 3 1/8 You still get the same answer. If you notice dividing by 5 and then by 3 is the same as dividing by 15