This teacher's guide accompanies Horizons' Horizons Math Grade 4, Student Workbook 1 and Horizons Math Grade 4 Student Workbook 2. A readiness test, notes on preparing a lesson, scope & sequence, appearance of concepts list, and development of concepts chart, are included before the lesson plans. Each lesson features the concept, numbered objectives, teaching tips, materials/supplies/equipment list, activities with notes on when to introduce lesson explanations and activities, and a quote. The answer key for both books is placed after the lesson notes, and features line-listed answers arranged by lesson. Finally, a section of student reproducibles is included for use with the lessons. 398 pages, softcover.