Fun and numbers are perfect! Math Mini Trump Cards Although it has been opened once, it is unused. It was a bonus from Challenge First Grader. I am selling it because I don't use it. The cards are small size (4.5cm * 6cm), so It's easy to use even for small children who are starting to become interested in numbers. You can enjoy it with friends and family! I am also selling other Challenge bonuses. If you are interested in purchasing multiple items, Please comment as I may be able to offer a discount. Prices may change, items may be deleted, and items may be relisted. Please understand that this item is stored at home. Thank you very much!