The transition to secondary school is often not easy: New tasks and a higher level of performance challenge 5th-grade students. This workbook presents a variety of engaging tasks that cover many areas of the math curriculum: natural and whole numbers, basic arithmetic operations, expressions, calculations with measurements, working with diagrams, probability, and combinatorics. This allows students to review topics covered in class, deepen their mathematical knowledge and skills, practice calculation techniques, and prepare for upcoming tests throughout the year. The removable answer section provides complete and partially illustrated solution paths, enabling students to independently follow and verify their calculations.