Puzzling, calculating, and solving riddles in the number range up to 100, recognizing logical patterns and rules, tackling tricky calculation triangles, and engaging with geometric shapes – practice with text and puzzle tasks. The 2nd grade from the popular "… practice" series playfully trains children's skills in mathematics. Fishing games and funny witches help calculate combinations and probabilities. Math stories about surfing grandmothers and fascinating sea creatures provide a cheerful break when solving word problems. A challenging treasure hunt supports the development of spatial thinking. With plenty of puzzle fun, important foundations of mathematics and logical thinking are trained almost incidentally. The tasks are aligned with the curriculum.