Japanese Abacus for Kids: (Black & White Version). a Step-By-Step Guide to Addition and Subtraction Using the Japanese Abacus (Soroban). by MR Paul Green (Paperback / softback, 2016)
(Black & white version of the original colored version). This book will teach you step-by-step how to perform addition and subtraction on a Japanese abacus. Clearly explained with text and pictures throughout every stage of your calculation. It has been specifically written for children.