sorobán, ábaco japonés 19
soroban, Japanese abacus- it is an abacus that is used vertically and observing it that way, at the top it has a row with only one count per column, which is worth five points- At the bottom, the columns with four beads each appear. In this way and according to its position, down or up, joining the accounts of the same column, you can add in total, nine units per column-
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