Learning to calculate through play for children aged 5 and up. The varied exercises focus on the number range up to 25. They consist of challenging counting tasks, number words, addition and subtraction, recognizing and evaluating quantities, as well as logical completion and combination. The three friends, Mouse, Elephant, and Duck, accompany, assist, and motivate, ensuring that solving these tasks is particularly enjoyable. To work on this exercise book, you will need the miniLÜK solution device.