When you end up with prime numbers for example If you factored out 12 you could say 3x4. Now 3 is a prime number so it cant be broken down any more. You can break down 4 into 2x2. 2 is a prime number so cant be broken down any further. When 12 is factored out it is 2x2x3
To find the best deal find the unit rate. City express unit rate for pants per dollars is 1 pair : $20.33 Denim Planet unit rate is 1 pair : $36.50 New Threads Unit rate is 1 pair : $27.50 So City Express is the best deal
