Material: Plastic, Size: 43x 30 x48mm Digital Teaching Stamp: Addition and Subtraction Math Stamp, addition and subtraction within 100, can be adjusted flexibly, a fun and meaningful gift for your child! Efficient and fast: Rotate and adjust column types, you can adjust 10 different queue sides. , you can quickly prepare math problems for your child at home. You can quickly complete the quiz simply by scrolling through the math questions. Addition: 10 different queue modes can be adjusted to mee