This math roller stamps is ideal for group activities and collaborative learning. Students can take turns rolling the stamp and solving the problems it creates, fostering a sense of teamwork and cooperation. The stamps are also a great addition to math centers or stations, providing a fun and interactive way for kids to practice addition and Subtractions. Features -Color:Multi -Material:Plastic -Size:6.50X4.70X3.00cm/2.55X1.85X1.18in -Improves math skills: automatically generates addition and Subtractions problems within 100, helping young students enhance their math abilities -Adjustable questions: easily change the math problems by turning the button, providing a continuous variety of exercises -Efficient printing: the smooth rolling mechanism ensures fast and efficient printing of math problems, making practice sessions more productive -Compact and portable: small and delicate design allows for easy portability, fitting ideal in a stationery bag or pocket -Unique and fun: the distinctive stamp design makes learning math enjoyable, encouraging children to practice regularly Package list: 2 stamps + 2 bottles of stamp ink, math question stamps