This challenge requires a Level 10 or higher skill because all the Skill Training bead mechanics are needed to do this exercise. This is a great way to practice all your soroban skills in a single exercise.
This is an introduction to mental math using the Kami Soroban or paper Soroban. One of the main objectives of our Soroban training is to elimi...
The main method of addition and subtraction on the abacus is understanding and using the 5 complement pairs of 10, i.e. pairs of numbers that ...