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Date: 2007-03-27 14:52:24Elementary arithmetic Chinese mathematics Japanese mathematics Soroban Suanpan Roman abacus 算盤 Mental calculation Subtraction Mathematics Abacus Binary operations | ?? Abacus: Mystery of the BeadAdd to Reading ListSource URL: webhome.idirect.comDownload Document from Source WebsiteFile Size: 405,90 KBShare Document on Facebook |