This abacus "Soroban" can be used just like normal abacus.
You can change the size of the abacus.
Log is saved as the value of each digit of the abacus, you can check where you make a mistake later viewing. Let me check the process of calculating the child look at the log.
There are calculator, abacus display is displayed.
Calculation results are stored as a log of the calculator, you can check it for later viewing.
Be a smart and you can practice the abacus.
By the addition of the abacus in daily from 1 to 100, we use to prevent blur.
Sometimes, there may be effective in repelling the abacus by left hand.