This book is about playing with mathematics, teaching: (1) How to multiply and divide large numbers mentally; (2) Making addition and subtraction easy; (3) Tricks for understanding fractions and decimals; and (4) How to quickly check answers for each calculation. Described as a foolproof way to do multiplication, division, factoring estimating, and more, the book is designed to assist even those who have struggled with math in the past. Following a preface and introduction, the book includes: (1) Multiplication: Getting Started; (2) Using a Reference Number; (3) Numbers Above the Reference Number; (4) Multiplying Above & Below the Reference Number; (5) Checking Your Answers; (6) Multiplication Using Any Reference Number; (7) Multiplying Lower Numbers; (8) Multiplication by 11; (9) Multiplying Decimals; (10) Multiplication Using Two Reference Numbers; (11) Addition; (12) Subtraction; (13) Simple Division; (14) Long Division by Factors; (15) Standard Long Division Made Easy; (16) Direct Long Division; (17) Checking Answers (Division); (18) Fractions Made Easy; (19) Direct Multiplication: (20) Putting It All into Practice; and Afterword. Eleven appendices are included: (1) Using the Methods in the Classroom; (2) Working Through a Problem; (3) Learn the 13, 14 and 15 Times Tables; (4) Tests for Divisibility; (5) Keeping Count; (6) Plus and Minus Numbers; (7) Percentages; (8) Hints for Learning; (9) Estimating; (10) Squaring Numbers Ending in 5; and (11) Practice Sheets. An index is included. [This book is also available as an e-book.]