Chii chinonzi Abacus?
Context:Abhakusi (muzhinji abaci kana abacuses), inonziwo chimiro chokuverenga, chishandiso chokuverenga icho chave chichishandiswa kubvira kare kare. Yaishandiswa kuNear East yekare, Europe, China, uye Russia, zviuru zvemakore nhamba dzechiHindu nechiArabic dzisati dzatanga kushandiswa. Mabviro chaiwoiwo eabacus haasati aoneka. Inoumbwa nemitsara yemabheji anofambiswa, kana kuti zvimwe zvinhu zvakafanana, zvakarukwa pamusoro petambo. Zvinomirira manhamba. Imwe yenhamba mbiri yacho inogadzirwa, uye marozari acho anoshandurwa kuti aite basa rakadai sokuwedzera, kana kuti kunyange tsime rechina kana kuti remakubhiti.  Pakutanga-tanga, tambo dzezvirongo zvacho dzaigona kunge dzakasununguka kana kuti dzakapetwa-petwa. Gare gare marozari akaitwa kuti atsvedzerere pamatanda uye akaiswa mufuremu, zvichibvumira kushandiswa nokukurumidza. Mabhakisi achiri kugadzirwa, kazhinji kazhinji sefuremu yemishenjere ine mipendero inotsvedza pamambure. Munyika yekare, zvikurukuru pamberi pekuunzwa kwechiratidzo chenzvimbo, mabhakusi akanga ari chishandiso chinoshanda chokuverenga. Abhakusi ichiri kushandiswa kudzidzisa nheyo dzemasvomhu kuvamwe vana, somuenzaniso, muRussia.
Abacus chishandiso chokuverenga chinoshandisa mabhero anofambiswa anowanzogadzirwa pachigadziko chemushenjere