This book will help all 5th grade students sharpen their observation skills and mathematical thinking. Through creative engagement with problem-solving, students will develop their critical thinking skills - a necessary skill in modern society - while also having the opportunity to approach Mathematics as a game and come to love it.

This book is divided into chapters according to the school textbook and contains:
- Solved problems
- Practice problems
- Problems for strong solvers
- Problems presented in Mathematical Competitions
- Evaluation criteria
- Simulation criteria for the Mathematical Competitions "Pythagoras" and "Little Euclid" of the Hellenic Mathematical Society (H.M.S.), local competitions from the H.M.S. branches, and the international Mathematical Competition "Kangaroo".

At the end of the book, all the answers to the problems are provided, so that the child is left with no questions or doubts.