Zumbers is a free mental calculation game  

Children love playing games, it is an axiom that everyone knows and that doesn’t need to be proven. Sometimes, parents are concerned about the fact that their offsprings devote too much time to ludic activities instead of studying. But some games can improve pupils’ scholar performance. Zumbers is a game of this kind. This app helps to improve the capacities for mental calculations in a playful manner. You will calculate faster and better after playing it, but above all, you will understand that mathematics can be fun, joyful and competitive.