Our school, our classroom, our explorations -- An overview of the share-and-compare method -- Predicting the weight of wooden unit blocks using nonstandard units of measurement -- Predicting how many pattern blocks will balance a wooden unit block -- -- Looking back at the activities -- Using a multi-age classroom to enhance problem solving -- Developmental stages of young problem solvers -- Children who enjoy solving problems -- Isn't that interesting? -- Dispelling some myths about problem solving -- Problem solving plus drill and practice -- Why problem solving is important.