The books listed below are for free. Just click on the photo and you will be directed to a file saved on a google drive.

Basic Math and Pre-Algebra: Tutorial and Practice Problems by Carolyn Wheater
Basic Math & Pre-Algebra for Dummies, 2nd Edition by Mark Zegarelli
McDougal Littell Pre-Algebra by Larson, Boswell, Kanold, and Stiff
Pre-Algebra by Openstax
Pre-Algebra Demystified, 1st Edition by Allan Bluman

Homework Helpers: Basic Math And Pre-Algebra by Denise Szecsei
Prealgebra Textbook, 2nd Edition, College of the Redwoods
Introduction to Mathematical Thinking by Keith Devlin

1001 Basic Math & Pre-Algebra Practice Problems For Dummies by Mark Zegarelli
Pre-Algebra Essentials For Dummies by Mark Zegarelli, Krista Fanning
Glencoe Pre-Algebra, IL Student Edition by McGraw Hill
Prealgebra2e by Openstax