Maria Montessori emphasized the importance of mathematics for the personal development of every child. The materials recommended by Montessori, such as rods, beads, and chips, invite children to explore and experiment. This way, children gain their first mathematical insights playfully and through various senses. With the help of the worksheets in this volume focused on the number range of 0-10, initial knowledge is deepened and elevated to a cognitive level. The child's thinking and organizational structures are supported and expanded. All important aspects of the concept of numbers are taken into account. The worksheets are versatile: they are suitable for reinforcement as well as for differentiation in teaching. From the templates, students' notebooks can be freely compiled. The worksheets are tried and tested in practice. Their clear design allows students to handle them easily.