Learn soroban

Short lessons introducing the Japanese abacus and its main formulas.

Learn soroban

Short lessons introducing the Japanese abacus and its main formulas.

Reading the soroban

How to represent numbers with upper beads, lower beads and decimal rods.

When to activate beads directly without complement formulas.

When to remove active beads directly.

Complements to 5 for using the upper bead.

Complements to 10 for carrying or borrowing between columns.