Four-in-One Math Practice Gadget: Use this "rolling stamp" to easily assign homework for children, including multiplication, addition, division, and subtraction exercises. Random Math Questions: Simply spin the wheel to generate random questions and print them onto paper. Ideal for 3rd-6th grade math practice, covering 1x1 arithmetic. Clear Printing: The ink works on most paper and is fade-resistant. (Recommended for use on the back of discarded documents to save paper). Covers numbers up to 100, addition and subtraction, multiplication tables, or division. Reusable: The included ink can be refilled for the "Math Problem Roller Stamp." The transparent storage box prevents ink spills, and they can be easily stored in your child's pencil case. Surprise for Kids: A unique gift for boys and girls starting school. Helps elementary students improve their math skills and enhance concentration. A great school supply set.