abacus soroban

the application "abacus" is in the form of a Japanese abacus named "soroban".

In this exercise you will train yourself to:

-Read the beads represent on the abacus

- Compose on the abacus the number

- Train for the four operations (addition-subtraction-multiplication and division)

the purpose of the "abacus" application is to improve the imaginition of pearls and the development of mental calculation skills.