WISSNER active learning Jumbo Arithemtic String, 20 RE Wood balls red/white

Demonstration calculation chain 20er number space: 20 red / white balls (diameter 25 mm) from RE-Wood , in the 5 er step on a 100 cm long cord. playfully promote numerical comprehension and facilitate access to the numerical range up to 20 and to abstract mental arithmetic packed in polybag made of RE-Wood : 100% recyclable, certified with the PEFC seal and free of harmful substances; complies with toy standard DIN EN71-3 Made in Germany