This workbook has been developed to reinforce students' mental arithmetic skills and teach them to master multiplication tables up to 10x10. It follows a global pedagogical approach that is particularly suited to classes G3, G4, and G5. This book includes more than 20 multiplication tables to complete and over 70 days of multiplication practice problems consisting of +4200 operations to solve, to encourage regular and thorough practice. Please note that these exercises are time-tested to assess learning progress.This pedagogical tool presents a systematic way of consolidating the basics of mental arithmetic while encouraging active participation in learning.