NUMBER WRITE AND WIPE ACTIVITY CARDS This write-on wipe-off card deck features reusable surfaces so kids can easily practice their work, wipe it away, and start again! Using the included dry-erase marker, children will master in numbers and mathematics. With Mathematics 30 cards in the box, there's plenty of space for kids to write, which encourages repetition and success. Children can practice written skills using these cards. Easy operational and can exercise baby coordination ability with hands,eyes and brain. Great for use in classrooms and home.