If your child is CM1 and CM2, and even in the sixth, this notebook-book is for him, and all those of his collection, the same author: problems, fractions, measurements. The exercises are well made, with a playful side of very good quality, they are well designed to advance the child succeeds, no traps, it's always interesting, solutions are given in end, in short I say enough! I find them much better than books called "support" in the same field.