Play and learn - arithmetic for the little ones. All numbers from 1 to 9 have a special friend. Two numbers that add up to 10 are best friends. Making tens in a clear, visual way is fun and easy with these beautiful wooden number blocks. The larger the number, the higher the block. This BY ASTRUP® product is perfect forarithmeticwith your child. The set contains 15 numbers, each 2 cm thick, and a nice fabric pouch to keep the numbers safe when not in use. The toys are specially made for learning and entertainment. Suitable for: learning, understanding numbers and amounts, curiosity. All toys comply with the current European safety regulations for toys and are CE marked.