ANSWER KEY : Updated in July, 2015. Now includes an answer key. AUTHOR : Chris McMullen earned his Ph.D. in physics from Oklahoma State University and currently teaches physics at Northwestern State University of Louisiana. He developed the Improve Your Math Fluency series of workbooks to help students become more fluent in basic math skills. CONTENTS : This practice book is designed to help students develop proficiency with their subtraction skills by offering ample practice. This book is conveniently divided up into five parts: Part 1 reviews subtraction facts with single-digit minuend and difference since swift knowledge of these is critical toward subtraction mastery. - Part 2 is limited to two-digit numbers minus one-digit numbers. This way students are not challenged with too much too soon. - Part 3 focuses on two-digit minus two-digit subtraction. - Part 4 involves three-digit numbers. - Part 5 features a variety of multi-digit subtraction problems. - An introduction describes how parents and teachers can help students make the most of this workbook. - An addition table is provided to help students who are just learning their subtraction facts. PRACTICE : This is a practice workbook geared toward practicing problem-solving skills. As such, it consists of worksheets with practice problems in the spirit of old-fashioned practice sheets. This is suitable for students who need to practice basic skills, and is effective for many students. It is not one of the modern math textbooks that are designed to entertain bored students. PHOTOCOPIES : The copyright notice permits parents/teachers who purchase one copy or borrow one copy from a library to make photocopies for their own children/students only. This is very convenient if you have multiple children/students or if a child/student needs additional practice. THE IMPROVE YOUR MATH FLUENCY SERIES OF WORKBOOKS Chris McMullen, Ph.D. This series of math workbooks is geared toward practicing essential math skills. As a physics teacher, Dr. McMullen observed that many students lack fluency in fundamental math skills. In an effort to help students of all ages and levels master basic math skills, he published this series of math workbooks on arithmetic, fractions, algebra, trigonometry, and more. RELATED BOOKS IN THE IMPROVE YOUR MATH FLUENCY SERIES Multiplication Facts Practice Book : This workbook provides ample practice with basic multiplication facts with the numbers 0 thru 10. ISBN: 1448606896. 7000 Multiplication Problems Practice Workbook : This workbook begins with a review of multiplication facts and then progresses into multi-digit multiplication. Includes answers. ISBN: 1448613132. 4500 Multiplication Problems with Answers Practice Workbook : This version of the previous book includes a concise explanation and guided example at the beginning of each chapter. ISBN: 1468080261. Division Facts Practice Book : This workbook provides ample practice with basic division facts with the numbers 0 thru 10. ISBN: 1448609755. Master Long Division Practice Workbook : This workbook begins with a review of division facts and then progresses into multi-digit division. The last couple of chapters include remainders. Answers are tabulated at the back. ISBN: 1448614252. Master Long Division with Remainders Practice Workbook : This version of the previous book includes a concise explanation and guided example at the beginning of each chapter. ISBN: 1481954156. Practice Adding, Subtracting, Multiplying, and Dividing Fractions Workbook : This workbook provides ample practice with these essential fraction skills. Each section begins with a concise explanation and a couple of examples to serve as a guide. ISBN: 1451534701. Algebra Essentials Practice Workbook with Answers . Practice essential skills like solving for unknowns, factoring, the quadratic formula, and substitution. Each section begins with a short review, including examples. ISBN: 1453661387. Chris McMullen is a physics instructor at Northwestern State University of Louisiana. He earned his Ph.D. in phenomenological high-energy physics (particle physics) from Oklahoma State University in 2002. Originally from California, he earned his Master's degree from California State University, Northridge, where his thesis was in the field of electron spin resonance. As a physics teacher, Dr. McMullen observed that many students lack fluency in fundamental math skills. In an effort to help students of all ages and levels master basic math skills, he has published this Improve Your Math Fluency Series of math workbooks on arithmetic, fractions, and algebra. Used Book in Good Condition