This printed Teacher's Edition contains: weekly planners; daily lesson plans with suggestions for differentiation; daily formative assessment opportunities with accompanying teacher tips; and a formal assessment routine for data collection.

The Number Worlds, Level B (Grade K) Teacher Edition provides lesson plans, Project Based Learning activities , and purposeful activities to help students develop conceptual understanding and computational fluency as they actively apply concepts.​ The TE also includes a differentiated learning guide.

Teacher Editions and eBooks allow teachers todevelop critical math concepts with routine lessonplans, integrated project-based learning, and a guide forfacilitating differentiated learning in the classroom.

Assessment tools allow teachers and administrators tocorrectly place and monitor at-risk students. A variety ofassessment options evaluate student proficiency, informinstruction, and visually track progress.