Melfried Olson & Travis Olson 
Pre-Algebra Practice Book, Grades 6 — 8 [PDF ebook] 

Make algebra equations easy for students in grades 6 and up using Pre-Algebra Practice! This 128-page book is geared toward students who struggle in pre-algebra and covers the concepts of real numbers, integers, properties, operations, exponents, square roots, and patterns. The book supports NCTM standards and includes clear instructions, examples, practice problems, definitions, problem-solving strategies, an assessment section, answer keys, and references.