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• 【Digital Teaching Stamp Roller】 The  Roller Stamp brings a convenient way for addition and subtraction games. Gently scrolling and math problems will appear right in front of you. It can efficiently and quickly print out about 100 math problems.
• 【Adjustable Design】 Rotate and adjust the column type, the Math Practice Number Rolling Stamp can adjust different queue methods. Simply twist the button to change the question. Develop children’s logical calculation ability.