vintage abacus tool set used for making mathematical calculations |
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| navigate by keyword : abacus tool mathematical math mathematics rods set vintage brown beads black frame isolated white calculation calculations addition subtraction multiplication division school easy chinese compute antique ancient japanese soroban mental smart bead arithmetic childhood object finance education number calculator count traditional learn business closeup old red row work symbol formula rod shape icon arranging archival fashioned retro style color construction cut calculating sign effortless student studying teaching educational subject culture technology learning difficulty single close intelligence counting supplies |
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| a vintage abacus tool set with 17 rods of brown beads and in a black frame used for making mathematical calculations easy isolated in a white background |
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