Building Blocks Cube 20mm is a classic teaching tool for mathematics and spatial thinking enlightenment. It is composed of multiple 20mm square volume wooden blocks, mostly made of environmentally friendly plastic, with rich colors and smooth surfaces, rounded corners, and safe and burr free edges. In mathematics teaching, it can be used to understand numbers and basic operations, such as using building blocks to represent quantities, demonstrating the process of addition and subtraction operations, etc. In addition, teachers can organize group activities to encourage students to collaborate in building complex shapes, cultivate their teamwork and communication skills, and be a powerful assistant for mathematics and comprehensive quality development from kindergarten to primary school.