Edo Currency Arithmetic Calculator (Abacus?)
This calculator performs basic arithmetic operations using Edo-period currency units: ryō, bu, shu, and mon.
| ryō bu shu mon | |
| Remainder in division mon | |
Calculations are based on the following equivalences: 1 ryō = 4 bu = 16 shu = 4,000 mon. Edo-period currency involves a mix of the decimal and quaternary systems, making calculations complicated. It is possible that people generally avoided performing calculations involving different types of currency.
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