This is the book which accompanies our Mental Math Mentor software, and it may be purchased separately. Co-authored with Don Skow, long-time Contest Director for UIL Number Sense and Mathematics, this book has careful explanations in a step-by-step format for over 50 math "tricks", or short cuts, including exercises using each element. The software is suitable for the youngest competitor, starting the exercises to learn multiplication tables, squares of numbers, Roman numerals, and such, and building to advanced skills in estimating cube roots or squaring a 3-digit number in your head to estimating the product of multiplying up to 4 numbers with 2 to 3 digits in each. In this day of calculators, this is a powerful skill that enables students to do math in their heads quickly and efficiently.