Author Description

This book introduces the base 10 abacus rules for carryover and two digits addition and subtraction on abacus. The alternated number– and bead– arithmetic calculation practices train your child to acquire addition and subtraction skills and build an abacus image in the mind at the same time. A red and green color abacus is strongly recommended because it helps your child build a strong, vivid mental image. Remember that the abacus training is an essential part of transforming to mental arithmetic. Using the abacus to solve every problem helps your child master the key to mental arithmetic. The pages also feature a review after every unit, revisions and five tests to consolidate the child’s foundation of applying the rules. A time record is provided in the review pages and the tests. Students will show improvement not only in their accuracy, but also in their speed.