Sublime Subtraction: A Practical Guide to Using the 9-10 Method

This fascinating guide takes readers step-by-step through the author's innovative "9-10 Method" of subtraction. Upon applying the easy-to-learn principles presented in the guide, readers will be able to solve subtraction problems with one or more subtrahends with a speed and accuracy that will make the process of subtraction seem truly effortless.

The guide includes sample problems and answers.