Soroban
The Soroban is based on the Chinese Abacus which has 2 upper and 5 lower beads. The Japanese Soroban removed one upper and one lower bead since they w...
Unplugged Software LLC
1 頁 1 / 1
The Soroban is based on the Chinese Abacus which has 2 upper and 5 lower beads. The Japanese Soroban removed one upper and one lower bead since they w...