This book is ideal for reference. Its size (approximately 6″ X 7 1/2″)is designed to make it as versatile as possible and still give the reader the necessary tools to master basic math concepts. This book has some unique features such as an Illustrated Table of Contents and Appendix, Leveling Techniques, Self-Checking Techniques, Illustrated Trig Formulas, and many Trade Tricks left out of traditional math books.