Scales With The Number
Order it before 3 hours y 55 minutes and receive it between on Monday 7 and Tuesday 8 with MRW
Promotes thinking and evolution of basic arithmetic operations. With 20 dumbbells, hand numbered and 10 of the hanger-racks, on each of them. Stands for balance, when there is a relationship of equality between the 2 hands, so the notion of computation and equivalence become fully clear in practice.