Sandall 
Helping Students Understand Pre-Algebra, Grades 7 – 8 [PDF ebook] 

Facilitate a smooth transition from arithmetic to pre-algebra for students in grades 7 and up using Helping Students Understand Pre-Algebra. This 128-page book includes step-by-step instructions with examples, practice problems using the concepts, real-life applications, a list of symbols and terms, tips, and answer keys. The book supports NCTM standards and includes chapters on topics such as basic number concepts, operations and variables, integers, exponents, square roots, and patterns.