With this material, you will prepare your special education students to handle units of measurement and measuring tools—an important skill for successfully navigating everyday life! The tasks in this book align with the concept of active-discovery learning. Students learn to accurately assess and measure distances and their significance. A key focus is on the area of "estimation." This helps students develop a sense of lengths and learn to gauge whether something is long or short, big or small, far or near. Through open-ended tasks, all students can engage with the material according to their abilities. A didactic-methodological commentary, practical implementation tips, and an overview of all sub-learning objectives complete the volume.