The Subtraction Charts & Tiles set includes three working boards and a set of wooden tiles in lidded box. The two smaller charts measure 41 cm x 25 cm each, and the larger chart is 60 cm x 25 cm. The tiles are 17 mm square. Learn more about how to use the Subtraction Charts at InfoMontessori.
All Gonzagarredi products are approved by the Association Montessori Internationale (AMI).