Melfried Olson & Travis Olson 
Algebra Practice Book, Grades 7 — 8 [PDF ebook] 

Make algebra equations easy for students in grades 7 and up using Algebra Practice! This 128-page book is geared toward students who struggle in algebra and covers the concepts of number systems, exponential expressions, square roots, radical expressions, graphing, and linear and quadratic functions. The book supports NCTM standards and includes clear instructions, examples, practice problems, definitions, problem-solving strategies, an assessment section, answer keys, and references.