Collection of entertaining tasks for students of the 3rd grade. On the pages of this notebook you will find encrypted letters and numbers, multi-headed dragons, cleverly broken chocolates and many more interesting things. Having coped with this notebook, you will become a master of carpet laying and a real specialist in counting sweets. But will you be able to solve tasks with rugs and garland schemes, find the correct cube scans and guess who lives on Uncle Grisha's farm? Some tasks are really difficult, but we are sure that you will defeat them too. We hope you like the book!