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Key terms: use abacus beads wire row counting blind calculations tool schools abaci mathematical zero dates root grooves decimal taught frame tens beam counters abako quipu russian abacus gregor teaching instrument arithmetic horizontal scholars chinese abacus been used roman abacus each wire greek abacus beads in each elementary century bc subtraction roman empire soviet union vertical line beads on each numeral system blind students number of days multiplication representation margarita philosophica Search external links cited by footnotes on Wikipedia page Abacus: |
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