Bar code: 9782047335628 A breakdown by mathematical fields for cycle 3 (CM1 / CM2 / CM): An original differentiation device to manage the heterogeneity of classes and double-levels: exercises at two levels of difficulty (training, deepening ) and a wide choice of CM1 / CM2 activities. 1200 exercises and problems to feed the students in difficulty as the fastest. Activities promoting collaborative work and oral exchanges to communicate, search, represent, reason, calculate, model. "Method Points" and "Tool Points" to give working methods and learn about digital tools. A chapter devoted to problem solving.