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Soroban

Tool to calculate automatically with the abacus. Soroban is an evolution of Chinese abacus developed in Japan. It contains 1 quinary and 4 unary to count between 0 and 9.

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Soroban -

Tag(s) : Numeral System

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Soroban

Soroban Converter

From an abacus


















From a decimal number



See also: Calculator

Answers to Questions (FAQ)

What is a Soroban? (Definition)

A soroban is a Japanese abacus that has a quinary (for the value 5) and 4 unaries (for the value 1). It behaves like a classic abacus and allows you to add, subtract, multiply or divide.

How to use a Soroban?

The soroban stands horizontally, so that the quinary is at the top and the unaries at the bottom.

In its initial position, the balls are pushed outwards and all the columns show O-|-OOOO.

The count in base 10 is done as an addition: the 1 and the 5 are added for each column representing the units, then the tens, then the hundreds, etc. (from left to right)

Example: O-|O-OOO
O-|OO-OO
gives number 12

0O-|-OOOO
1O-|O-OOO
2O-|OO-OO
3O-|OOO-O
4O-|OOOO-
5-O|-OOOO
6-O|O-OOO
7-O|OO-OO
8-O|OOO-O
9-O|OOOO-

Who uses Soroban?

Surprisingly there are still many users of Soroban in Japan. Until recently, a Soroban competence test (with different levels of increasing difficulty) was required to work in some companies or departments.

The Chinese have also adopted its use, but the use in China is rarer.

Source code

dCode retains ownership of the "Soroban" source code. Except explicit open source licence (indicated Creative Commons / free), the "Soroban" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, breaker, translator), or the "Soroban" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, or API access for "Soroban" are not public, same for offline use on PC, mobile, tablet, iPhone or Android app!
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Cite as source (bibliography):
Soroban on dCode.fr [online website], retrieved on 2024-06-14, https://www.dcode.fr/soroban-abacus

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Questions / Comments

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https://www.dcode.fr/soroban-abacus
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