Book excerpt: This book reviews the necessary concepts that appear on the Pennsylvania Algebra I Keystone Exam - Module 1. The fifteen lessons include examples of how to complete problems and answer newly worded Keystone Exam questions. Each lesson includes 5 or 6 multiple-choice Keystone Exam style questions and 1 two-part constructed-response question about the topics covered in the lesson. Also included are two 20-question practice exams that include an answer key and scoring guidelines to gauge a student's ability level on the exam. Answers for all questions are provided to check the student's work and understanding.