Math Essentials: Finding and Filling the Gaps is a 13 part book created to help find and fill the gaps that hinder algebra studies. This book provides the answers for all exercises in the Math Essentials units, including supplemental exercises. The Math Essentials program assumes a student has mastered basic addition, subtraction and multiplication, but it addresses division, if needed, as this was commonly found to be weak. It isn't designated for use with a specific age or grade, but is addressed to students preparing to study algebra, and has most often been used with teens. The program includes a variety of tools an instructor can use to tailor the program to a student's needs. Diagnostic tests identify which math skills the student hasn't already mastered. The individual learning guide for each unit allows the student to study just what is needed. A variety of exercises allow the student to practice as much as needed and to stay sharp on skills learned. Each of the skills covered in the program are provided in individual books as well as all together in one full book. Learning guides and exams are provided for each skill, and may be used with both the appropriate individual books and the full book.