Each of the 12 books in this series focuses on a specific arithmetic topic and presents detailed lessons for a particular grade or span of grades. Lessons address the three important aspects of arithmetic instruction:

• computation
• number sense
• problem solving

Also, each lesson provides all of the information teachers need for implementation, including step-by-step directions, amount of time needed, materials required, classroom vignettes, samples of student work, and a discussion of the math underlying the lesson.