Answer (1 of 3): Just using the word Abacus can be a little confusing. There is an abacus with 10 rows and 10 beads each. Then there is a Chinese Abacus with 5 beads in the lower deck and 2 beads in the Upper Deck. But the Abacus or Soroban used for Abacus Mind Math has 4 beads in the lower deck
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