Calculating and understanding: The small 1:1 is the foundation of mathematics education. However, it also encounters us daily while shopping, cooking, or crafting. For your students to solve 1:1 tasks in school as well as in everyday life, it is important that they not only memorize the solutions but also understand how division works. The authors Andrea Fingerhut and Lisa Kröper provide you with the right materials to convey this profound understanding. They offer numerous tasks that allow your students to practice 1:1 initially using visual representations. Starting with the easier one-to-one sequences (2s, 5s, 10s), your students will then work on the calculation operation. The focus is on conveying division through the concepts of "division as partitioning" and "division as distributing" in a hands-on manner.