Roller Digital Teaching Stamp Addition And Subtraction Roller Stamp Within 100 Teaching Math Practice Questions Adjustable Stamp: The digital stamp can change different numbers to form math problems and scroll smoothly.And it supports efficient and fastprinting of less than 100 math problems.Improve the Efficiency of Learning: You can print quickly by simply scrolling through the addition and subtraction seal, and it dries quickly.Pupils do one page a day to improve the speed and accuracy of oralarithmetic.Train Logical Thinking: This number teaching seal is able to develop your child's sense of space and facilitate kids' number thinking and problem-solving by setting up 10 different ways of queuing.Can Be Used Repeatedly: The digital stampfor kids can be inked for reuse.The printing is clear, and the color does not fade after drying. The addition and subtraction seal contains the digital teaching seal and 1 bottle of ink.Best Gifts: The roller digital stamp is great for wonderful Christmasbirthdays Easter gifts for kids and other occasions.This is a special gift for kids, family, and friends.Specifications:Size: 4.8*4.4 cm/1.8*1.7 inchMaterial: PVCweight about: 69g.Product List:Digital Stamp*1Ink*1