Our District in Colorado started using CORE-PLUS from Glencoe 10 years ago and we are currently using the most recent edition. We have had great results and I personally LOVE using the program. CORE-PLUS integrates terrific mathematics content aligned to the Common Core Standards and Practices. The program is terrific at getting kids interested and engaged in mathematics. CORE-PLUS is the best program on the market for addressing how kids learn and develop mathematical habits of mind.