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Soroban Japanese abacus, with 15 digit and plastic case. Purchased from Association of Teachers of Mathematics, 2001.The Japanese abacus or soroban is a derivation of the Chinese abacus or suan pan, but has one bead above the bar and four below for decimal calculation. The bead above is worth 5 units, the beads below are worth 1.
Soroban Japanese abacus, with 15 digit. Purchased from Association of Teachers of Mathematics, 2001.
Plastic case for Soroban Japanese abacus, with 15 digit.
