As a middle school teacher of 23 years, I have spent many hours searching for rich mathematical problems with multiple solutions or multiple pathways to the solution. This type of problem is embedded in the lessons in the CPM curriculum. My students have grown not only in their problem solving skills but also in their ability to persevere and work through complex problems. My students look forward to presenting their solutions to their classmates. It is amazing and satisfying to watch learning take place as students question each other, test and justify their conclusions. You can "see" the light bulbs turn on!