Grimm's | 5 Maths FriendsWith Grimm's 5 Maths friends, children can discover the abstract world of numbers in a playful way. If acorns or flowers from nature are collected and put together in different ways, then new mathematic problems arise effortlessly. Calculating can be experienced with different senses when the hands can grasp what the eyes see. Every arithmetic friend is adorned with an arithmetic symbol of the 4 types of mathematics (addition, subtraction,