Adjustable Numbers, Gently Scrolling, And Quick Questions Without Paying A High Price For Math Problems.. Rotate And Adjust The Column Type, You Can Adjust 10 Different Queue Methods To Meet All Addition, Subtraction, Multiplication and Division Numbers From 1-100.. Arrangement Needs To Be Changed Every 10 Math Problems To Avoid Duplication.. The Mark Is Clear, Dry And Does Not Fade After Printing, And Ink Can Be Added For Repeated Use.. Parents Can Prepare Math Exercises For Their Children, And Children Can Also Prepare Exercises For Each Other, Learn Together, And Make Progress Together Specification: Material: PVC Styles: Addition/Subtraction/Multiplication/Division Size: 48*44*30MM Blot: 20*4MM Package Included: 4 Math Teaching Rolling Stamps?? 4 Ink Kind Tips: Due To Manual Measurement, Please Allow A Slight Error. Colors May Be Slightly Different Due To Different Monitors.