2-in-1 Quick Addition and Subtraction: Quickly prepare math problems for your kids at home – just roll the stamp. It dries quickly and is convenient and practical. Change the arrangement every 10 problems to avoid duplication.
Reusable: Small, easy to carry, and reusable after adding ink. The imprint is clear, does not fade after drying, and does not smudge easily.
Efficient and fast: Rotate to adjust between 10 different arrangements and quickly create a new quiz.
Unlimited Ink Refills: Refill holes on both sides – add 5-8 drops of ink when it runs out, wait a few minutes, and continue. Fits easily in stationery boxes and school bags.
Learning and Education Gift: A great gift – parents can quickly prepare practice problems, and children can prepare them for each other and learn together.