Giant arithmetic chain red/blue number range of 20 | Learn math counting chain school

20 red/blue balls (Ø 2.5 cm) made of RE-Wood®, in steps of 5 on a 100 cm long cord. Packed in poly bag. - Helps with the transition from calculating with fingers to abstract arithmetic, adding numbers in the number range up to 20 (plus calculation) and subtracting (minus calculation). - Count forwards and backwards from 1 to 20, capture quantities at a glance, break down quantities (7 breaks down into e.g. 5 and 2) - count in steps (e.g. 2, 4, 6, ... or 17, 15, 13, ...), even or odd numbers, neighboring numbers, multiplication / division (doubling / halving) - RE-Wood® consists of 100% recycled and natural materials, is PEFC certified and can be recycled again and again after use. - Manufactured in Bensheim/Hesse/Germany.