Lightweight yet sturdy, this addition and subtraction breakdown ruler features clear number markings and rounded edges that are scratch resistant in classrooms and classrooms Ideal for students, engineering professionals and parents seeking educational tools, bridging practical math applications and creative projects The fade-resistant surface maintains visibility in various lighting conditions and ensures durability when teaching sketches and basic math concepts Use them for geometry classes, architectural drafting, or family homework time to simplify measurements while promoting numerical literacy through hands-on learning The 20cm arithmetic addition and subtraction ruler combines a built-in addition and subtraction scale with precise measurements, providing a multi-functional measuring tool for precise calculations and geometric drawing tasks, Manufacturer: Netbiio