Have fun while learning with our calculation frame 20 x 4.5 x 6 cm. Basic operations (addition, subtraction, multiplication and division) and numerical comparisons from 0 to 20 can be learned or consolidated in a simple and clear way. Made of RE-Wood: 100% recyclable, certified with the PEFC seal and free of harmful substances; complies with the DIN EN71-3 toy standard. Our company has more than a 40 years long commitment in the education and training of children. Made in Germany in accompliance with all European regulations.