1, other abacus mental arithmetic adopts the formula of "complement each other" for teaching. Learning to recite formulas and then play with beads is very boring. It is easy to confuse the formula of "make up the number and complement the number", which is difficult for children to master and easy for children to lose interest in learning.

2. Li Ang abacus mental arithmetic replaces traditional formula teaching with interesting and vivid scene stories, so that children can easily master all kinds of abacus mental arithmetic in the game; Interesting, easy to learn, easy to understand and easy to teach, which has achieved a revolutionary breakthrough in abacus mental arithmetic teaching method!