Puzzle Stationery Combination and Decomposition Digital Decomposition Ruler Product description: main feature:Easy to use The slider selects a number from the box and the circle sums up and down. The moving board can calculate mathematical addition and subtraction. High-quality materials Clear figures protect the eyes, high-quality wood, each piece of wood is carefully selected, scientific chamfered, smooth surface without burrs, and will not hurt your fingers during the learning process. Mathematical enlightenment tool The digital decomposition rule can be 0-10 addition and subtraction, which is a good help for children's mathematical enlightenment. Developing learning interests This early childhood puzzle decomposition rule can make your baby not feel dull and bored while studying, and easier to learn in deeper memory. Home and school can use it In family education, parents can be used to guide children. In schools, teachers can be used as teaching tools. Good choice. Scenes to be used: Family/school Instructions: For example: 3+3=? Align the 3 of the upper and lower lines of the ruler. The number in the circle is the answer. Material: beech Size: 336cm Package Contents 1PC digital decomposition ruler Note: Due to differences in monitors and lighting effects, the actual color of the item may differ slightly from the color displayed on the image.