100 math blocks in 4 colours: From the practice for the practice! Very suitable for primary school pupils experiencing difficulty with math. The Author is Annette Bauer, who works as a learning therapist, speaker and author. In 2008 she was one of the winners of the competition »Mathe erleben« (experience maths) in Germany. The presented ideas for playing (42331, only in German!) are the result of her work with primary school children over many years. Materials: lime wood, non-toxic water based color stain/non-toxic plant based oil finish. Size: frame 33x24cm, single blocks 2x3cm.