The Kidnapping of the Black Square, or New Lessons from Grandpa Gavrila

Before you is an unusual children's book. It not only tells the adventures of a boy named Fedya and his friends but also trains important skills such as mathematical thinking and logic in a way accessible to children. Solving complex... problems in a textbook is boring and uninteresting. But it’s a completely different story when the plot involves a detective mystery! The kids will use their wit and cleverness to find the cunning criminal. Who is the kidnapper of grandpa’s favorite painting, the ‘Black Square’? Can we calculate the criminal using mathematical methods? And how do we build an equation with multiple conditions? The book is intended for middle and high school students and contains 200 problems for reinforcing the material. The engaging presentation of the material and clear explanations turn strict rules into an exciting game. Everyone can feel like a mathematical genius!