Primary Concepts Hands-On Learning Materials for PreK-3, Primary Concepts focuses on the essentials of the preschool and primary curriculum, emphasizing engaging, motivational, hands-on learning to build a foundation for academic success. Primary Concepts specializes in leveled libraries, classroom manipulatives, active learning and specials needs products and Montessori materials. We design our products to meet Pre K-3 teachers� needs and save their valuable time.