The 2nd Global Math Challenge Official Workbook, G4

The 2nd Global Math Challenge Official Workbook, G4 (for ages 9 – 12).

Global Math Challenge is an online contest for all ages presented by Sony Global Education, Inc.
Developed in association with the Japan Prime Math Olympic Committee, the contest puts a strong focus on developing flexible, logical thinking using Japanese mathematics as a basis. These workbooks are packed with questions, answers and explanations from the contest that will delight math lovers of all ages.