Math Pathways and Pitfalls (MPP) provides professional development for teachers, and intervention lessons for students in grades K-8. Together they address the need for improving instruction of key mathematical standards and learning pitfalls, regardless of the core instructional materials being used. There are 4 books with 20 to 22 lessons per book. The books for students in grades K-3 focus on whole number concepts, place value, and operations. Books for students in grades 4-8 focus on fractions, decimals, ratios, proportions, and percents. Algebra readiness is integrated into the lessons for students in grades 1-8.