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Counting rods

Small bars used for calculating in ancient East Asia

Summary

Small bars used for calculating in ancient East Asia

Field	Value
t	算籌
s	算筹
p	suànchóu
mi	su̯än⁵¹ ʈ͡ʂʰoʊ̯³⁵
c2	算子
p2	suànzǐ
mi2	su̯än⁵¹ t͡sz̩²¹⁴⁻²¹⁽⁴⁾
kanji	算木 / 算籌
hiragana	さんぎ / さんちゅう
romaji	sangi / sanchū
hangul	산가지 / 산목
hanja	算가지 / 算木
rr	sangaji / sanmok
qn	que tính / toán trù
hn	𣠗併 / 算籌

triangle]], as depicted by [[Zhu Shijie]] in 1303, using rod numerals]]'''Counting rods''' (筭) are small bars, typically 3–14 cm (1" to 6") long, that were used by mathematicians for calculation in ancient [[East Asia]]. They are placed either horizontally or vertically to represent any [[integer]] or [[rational number]].

The written forms based on them are called rod numerals. They are a true positional numeral system with digits for 1–9 and a blank for 0, from the Warring states period (circa 475 BCE) to the 16th century.

History

Chinese arithmeticians used counting rods for well over two thousand years ago.

In 1954, forty-odd counting rods of the Warring States period (5th century BCE to 221 BCE) were found in Zuǒjiāgōngshān (左家公山) Chu Grave No.15 in Changsha, Hunan.

In 1973, archeologists unearthed a number of wood scripts from a tomb in Hubei dating from the period of the Han dynasty (206 BCE to 220 CE). On one of the wooden scripts was written: "当利二月定算𝍥". This is one of the earliest examples of using counting-rod numerals in writing.

A square lacquer box, dating from c. 168 BCE, containing a square chess board with the TLV patterns, chessmen, counting rods, and other items, was excavated in 1972, from Mawangdui M3, Changsha, Hunan Province.

In 1976, a bundle of Western Han-era (202 BCE to 9 CE) counting rods made of bones was unearthed from Qianyang County in Shaanxi. The use of counting rods must predate it; Sunzi ( 544 to 496 BCE), a military strategist at the end of Spring and Autumn period of 771 BCE to 5th century BCE, mentions their use to make calculations to win wars before going into the battle; Laozi (died 531 BCE), writing in the Warring States period, said "a good calculator doesn't use counting rods". The Book of Han (finished 111 CE) recorded: "they calculate with bamboo, diameter one fen, length six cun, arranged into a hexagonal bundle of two hundred seventy one pieces".

At first, calculating rods were round in cross-section, but by the time of the Sui dynasty (581 to 618 CE) mathematicians used triangular rods to represent positive numbers and rectangular rods for negative numbers.

Toán trù 算籌 (counting rods) in a Vietnamese mathematics textbook, Cửu chương lập thành toán pháp 九章立成算法 is shown at the bottom of the page.

After the abacus flourished, counting rods were abandoned except in Japan, where rod numerals developed into a symbolic notation for algebra.

Using counting rods

Rod numeral place value from [[Yongle Encyclopedia]]: 71,824

A checker counting board diagram in an 18th-century Japanese mathematics textbook

Counting rod numerals in grids in a Japanese mathematic book

Counting rods represent digits by the number of rods, and the perpendicular rod represents five. To avoid confusion, vertical and horizontal forms are alternately used. Generally, vertical rod numbers are used for the position for the units, hundreds, ten thousands, etc., while horizontal rod numbers are used for the tens, thousands, hundred thousands etc. It is written in Sunzi Suanjing that "one is vertical, ten is horizontal".

Red rods represent positive numbers and black rods represent negative numbers. Ancient Chinese clearly understood negative numbers and zero (leaving a blank space for it), though they had no symbol for the latter. The Nine Chapters on the Mathematical Art, which was mainly composed in the first century CE, stated "(when using subtraction) subtract same signed numbers, add different signed numbers, subtract a positive number from zero to make a negative number, and subtract a negative number from zero to make a positive number".{{ Citation

This alternation of vertical and horizontal rod numeral form is very important to understanding written transcription of rod numerals on manuscripts correctly. For instance, in Licheng suanjin, 81 was transcribed as [[File:Counting rod h8.png]][[File:Counting rod v1.png]], and 108 was transcribed as [[File:Counting rod v1.png]][[File:Counting rod v8.png]]; it is clear that the latter clearly had a blank zero on the "counting board" (i.e., floor or mat), even though on the written transcription, there was no blank. In the same manuscript, 405 was transcribed as [[File:Counting rod v4.png]][[File:Counting rod v5.png]], with a blank space in between for obvious reasons, and could in no way be interpreted as "45"[[File:Counting rod h4.png]][[File:Counting rod v5.png]]. In other words, transcribed rod numerals may not be positional, but on the counting board, they are positional. [[File:Counting rod v4.png]][[File:Counting rod v5.png]] is an exact image of the counting rod number 405 on a table top or floor.

Place value

The value of a number depends on its physical position on the counting board. A 9 at the rightmost position on the board stands for 9. Moving the batch of rods representing 9 to the left one position (i.e., to the tens place) gives 9[] or 90. Shifting left again to the third position (to the hundreds place) gives 9[][] or 900. Each time one shifts a number one position to the left, it is multiplied by 10. Each time one shifts a number one position to the right, it is divided by 10. This applies to single-digit numbers or multiple-digit numbers.

Song dynasty mathematician Jia Xian used hand-written Chinese decimal orders 步十百千萬 as rod numeral place values, as evident from a facsimile from a page of Yongle Encyclopedia. He arranged 七萬一千八百二十四 as

He treated the Chinese order numbers as place value markers, and 七一八二四 became place value decimal numbers. He then wrote the rod numerals according to their place value: ::data[format=table] | 七 | 一 | 八 | 二 | 四 | |---|---|---|---|---| | 萬 | 千 | 百 | 十 | 步 | | [[File:Counting rod v7.png|20px]] | [[File:Counting rod h1.png|20px]] | [[File:Counting rod v8.png|20px]] | [[File:Counting rod h2.png|20px]] | [[File:Counting rod v4.png|20px]] | :: In Japan, mathematicians put counting rods on a counting board, a sheet of cloth with grids, and used only vertical forms relying on the grids. An 18th-century Japanese mathematics book has a checker counting board diagram, with the order of magnitude symbols "千百十一分厘毛" (thousand, hundred, ten, unit, tenth, hundredth, thousandth). ::data[format=table title="Zero and positive integers"] | | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | Vertical | Horizontal | |---|---|---|---|---|---|---|---|---|---|---|---|---| | | [[File:Counting rod v1r.png]] | [[File:Counting rod v2r.png]] | [[File:Counting rod v3r.png]] | [[File:Counting rod v4r.png]] | [[File:Counting rod v5r.png]] | [[File:Counting rod v6r.png]] | [[File:Counting rod v7r.png]] | [[File:Counting rod v8r.png]] | [[File:Counting rod v9r.png]] | | | | | | [[File:Counting rod h1r.png]] | [[File:Counting rod h2r.png]] | [[File:Counting rod h3r.png]] | [[File:Counting rod h4r.png]] | [[File:Counting rod h5r.png]] | [[File:Counting rod h6r.png]] | [[File:Counting rod h7r.png]] | [[File:Counting rod h8r.png]] | [[File:Counting rod h9r.png]] | | | | :: ::data[format=table title="Zero and negative numbers"] | | 0 | −1 | −2 | −3 | −4 | −5 | −6 | −7 | −8 | −9 | Vertical | Horizontal | |---|---|---|---|---|---|---|---|---|---|---|---|---| | | [[File:Counting rod v1.png]] | [[File:Counting rod v2.png]] | [[File:Counting rod v3.png]] | [[File:Counting rod v4.png]] | [[File:Counting rod v5.png]] | [[File:Counting rod v6.png]] | [[File:Counting rod v7.png]] | [[File:Counting rod v8.png]] | [[File:Counting rod v9.png]] | | | | | | [[File:Counting rod h1.png]] | [[File:Counting rod h2.png]] | [[File:Counting rod h3.png]] | [[File:Counting rod h4.png]] | [[File:Counting rod h5.png]] | [[File:Counting rod h6.png]] | [[File:Counting rod h7.png]] | [[File:Counting rod h8.png]] | [[File:Counting rod h9.png]] | | | | :: Examples: ::data[format=table] | 231 | 5089 | −407 | −6720 | |---|---|---|---| | | [[File:Counting rod v2r.png]] | [[File:Counting rod h3r.png]] | [[File:Counting rod v1r.png]] | | [[File:Counting rod h5r.png]] | | [[File:Counting rod h8r.png]] | [[File:Counting rod v9r.png]] | | | [[File:Counting rod v4.png]] | | [[File:Counting rod v7.png]] | | [[File:Counting rod h6.png]] | [[File:Counting rod v7.png]] | [[File:Counting rod h2.png]] | | :: ## Rod numerals Rod numerals are a positional numeral system made from shapes of counting rods. Positive numbers are written as they are and the negative numbers are written with a slant bar at the last digit. The vertical bar in the horizontal forms 6–9 are drawn shorter to have the same character height. A circle (〇) is used for 0. Many historians think it was imported from Indian numerals by Gautama Siddha in 718, but some think it was created from the Chinese text space filler "□", and others think that the Indians acquired it from China, because it resembles a Confucian philosophical symbol for "nothing".{{ Citation In the 13th century, Southern Song mathematicians changed digits for 4, 5, and 9 to reduce strokes. The new horizontal forms eventually transformed into Suzhou numerals. Japanese continued to use the traditional forms. ::data[format=table title="Positive numbers (traditional)"] | | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | Vertical | Horizontal | |---|---|---|---|---|---|---|---|---|---|---|---|---| | [[File:Counting rod 0.png]] | [[File:Counting rod v1.png]] | [[File:Counting rod v2.png]] | [[File:Counting rod v3.png]] | [[File:Counting rod v4.png]] | [[File:Counting rod v5.png]] | [[File:Counting rod v6.png]] | [[File:Counting rod v7.png]] | [[File:Counting rod v8.png]] | [[File:Counting rod v9.png]] | | | | | [[File:Counting rod 0.png]] | [[File:Counting rod h1.png]] | [[File:Counting rod h2.png]] | [[File:Counting rod h3.png]] | [[File:Counting rod h4.png]] | [[File:Counting rod h5.png]] | [[File:Counting rod h6.png]] | [[File:Counting rod h7 num.png]] | [[File:Counting rod h8 num.png]] | [[File:Counting rod h9 num.png]] | | | | :: ::data[format=table title="Negative numbers (traditional)"] | | 0 | −1 | −2 | −3 | −4 | −5 | −6 | −7 | −8 | −9 | Vertical | Horizontal | |---|---|---|---|---|---|---|---|---|---|---|---|---| | [[File:Counting rod -0.png]] | [[File:Counting rod v-1.png]] | [[File:Counting rod v-2.png]] | [[File:Counting rod v-3.png]] | [[File:Counting rod v-4.png]] | [[File:Counting rod v-5.png]] | [[File:Counting rod v-6.png]] | [[File:Counting rod v-7.png]] | [[File:Counting rod v-8.png]] | [[File:Counting rod v-9.png]] | | | | | [[File:Counting rod -0.png]] | [[File:Counting rod h-1.png]] | [[File:Counting rod h-2.png]] | [[File:Counting rod h-3.png]] | [[File:Counting rod h-4.png]] | [[File:Counting rod h-5.png]] | [[File:Counting rod h-6.png]] | [[File:Counting rod h-7.png]] | [[File:Counting rod h-8.png]] | [[File:Counting rod h-9.png]] | | | | :: ::data[format=table title="Positive numbers (Southern Song)"] | | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | Vertical | Horizontal | |---|---|---|---|---|---|---|---|---|---|---|---|---| | [[File:Counting rod 0.png]] | [[File:Counting rod v1.png]] | [[File:Counting rod v2.png]] | [[File:Counting rod v3.png]] | [[File:Counting rod 4 song.png]] | [[File:Counting rod v5 song.png]] | [[File:Counting rod v6.png]] | [[File:Counting rod v7.png]] | [[File:Counting rod v8.png]] | [[File:Counting rod v9 song.png]] | | | | | [[File:Counting rod 0.png]] | [[File:Counting rod h1.png]] | [[File:Counting rod h2.png]] | [[File:Counting rod h3.png]] | [[File:Counting rod 4 song.png]] | [[File:Counting rod h5 song.png]] | [[File:Counting rod h6.png]] | [[File:Counting rod h7 num.png]] | [[File:Counting rod h8 num.png]] | [[File:Counting rod h9 song.png]] | | | | :: Examples: ::data[format=table] | Traditional | Southern Song | 231 | 5089 | −407 | −6720 | |---|---|---|---|---|---| | [[File:Counting rod v2.png]][[File:Counting rod h3.png]][[File:Counting rod v1.png]] | [[File:Counting rod v2.png]][[File:Counting rod h3.png]][[File:Counting rod v1.png]] | | | | | | [[File:Counting rod h5.png]][[File:Counting rod 0.png]][[File:Counting rod h8 num.png]][[File:Counting rod v9.png]] | [[File:Counting rod h5 song.png]][[File:Counting rod 0.png]][[File:Counting rod h8 num.png]][[File:Counting rod h9 song.png]] | | | | | | [[File:Counting rod v4.png]][[File:Counting rod 0.png]][[File:Counting rod v-7.png]] | [[File:Counting rod 4 song.png]][[File:Counting rod 0.png]][[File:Counting rod v-7.png]] | | | | | | [[File:Counting rod h6.png]][[File:Counting rod v7.png]][[File:Counting rod h2.png]][[File:Counting rod -0.png]] | [[File:Counting rod h6.png]][[File:Counting rod v7.png]][[File:Counting rod h2.png]][[File:Counting rod -0.png]] | | | | | :: In Japan, Seki Takakazu developed the rod numerals into symbolic notation for algebra and drastically improved Japanese mathematics. After his period, the positional numeral system using Chinese numeral characters was developed, and the rod numerals were used only for the plus and minus signs. ::data[format=table] | Western | Seki | After Seki | |---|---|---| | *x* + *y* + 246 | **[[File:Counting rod v1.png]]甲[[File:Counting rod v1.png]]乙[[File:Counting rod v2.png]][[File:Counting rod h4.png]][[File:Counting rod v6.png]]** | **[[File:Counting rod v1.png]]甲[[File:Counting rod v1.png]]乙[[File:Counting rod v1.png]]二四六** | | 5*x* − 6*y* | **[[File:Counting rod v5.png]]甲[[File:Counting rod v-6.png]]乙** | **[[File:Counting rod v1.png]]五甲[[File:Counting rod v-1.png]]六乙** | | 7*xy* | **[[File:Counting rod v7.png]]甲乙** | **[[File:Counting rod v1.png]]七甲乙** | | 8*x* / *y* | N/A | **乙[[File:Counting rod v1.png]]八甲** | :: ## Fractions ::figure[src="https://upload.wikimedia.org/wikipedia/commons/2/2e/Rod_fraction.jpg" caption="7}}"] :: A fraction was expressed with rod numerals as two rod numerals one on top of another (without any other symbol, like the modern horizontal bar). ## Rod calculus *Main article: Rod calculus* The method for using counting rods for mathematical calculation was called *rod calculation* or rod calculus (筹算). Rod calculus can be used for a wide range of calculations, including finding the value of [](pi), finding square roots, cube roots, or higher order roots, and solving a system of linear equations. Before the introduction of a written zero, a space was used to indicate no units, and the rotation of the character in the subsequent unit column, by 90°, adopted, to help reduce the ambiguity in record values calculated on the rods. For example 107 (𝍠 𝍧) and 17 (𝍩𝍧) would be distinguished by rotation, though multiple zero units could lead to ambiguity, eg. 1007 (𝍩 𝍧), and 10007 (𝍠 𝍧). Once written zero came into play, the rod numerals had become independent, and their use indeed outlives the counting rods, after its replacement by abacus. One variation of horizontal rod numerals, the Suzhou numerals is still in use for book-keeping and in herbal medicine prescription in Chinatowns in some parts of the world. ## Unicode *Main article: Counting Rod Numerals* Unicode 5.0 includes counting rod numerals in their own block in the Supplementary Multilingual Plane (SMP) from U+1D360 to U+1D37F. The code points for the horizontal digits 1–9 are U+1D360 to U+1D368 and those for the vertical digits 1–9 are U+1D369 to U+1D371. The former are called *unit digits* and the latter are called *tens digits*,{{ Citation ## References ## References 1. Lay-Yong, Lam. (1986). ["The Conceptual Origins of our Numeral System and the Symbolic Form of Algebra"](https://www.jstor.org/stable/41133800). *Archive for History of Exact Sciences*. 2. ["中国独特的计算工具"](http://mkd.lyge.cn/zhanzheng/a04/x3/040.htm). 3. [http://www.tutorvista.com/math/ancient-china-math Ancient China Math] {{Webarchive. [link](https://web.archive.org/web/20110126232121/http://www.tutorvista.com/math/ancient-china-math). (2011-01-26 – Copyright © 2010 – TutorVista.com, All rights reserved.) 4. WONG, Pui Yin Marianne. (Mar 2006). ["The Siling (four cardinal animals) in Han Pictorial Art - vol 1"](https://eprints.soas.ac.uk/28946/1/10673190.pdf). *SOAS*. 5. ["BabelStone Blog : The Lost Game of Liubo Part 4 : Game Boards and Equipment"](https://www.babelstone.co.uk/Blog/2011/01/lost-game-of-liubo-part-4-game-boards.html). 6. Wu Wenjun ed, Grand Series of History of Chinese Mathematics, vol 1, p371 7. (2004). ["Fleeting Footsteps: Tracing the Conception of Arithmetic and Algebra in Ancient China"](https://books.google.com/books?id=fGYmpWE5UZgC&q=tomb+in+Hubei+rod+numerals&pg=PA45). *World Scientific*. 8. 孫子: 夫未戰而廟算勝者，得算多也 9. 老子: 善數者不用籌策。 10. Zhu, Yiwen. (2018). ["How were Western written calculations introduced into China? — An analysis of the Tongwen suanzhi (Arithmetic Guidance in the Common Language, 1613)"](https://www.researchgate.net/publication/326525684). 11. [http://zh.wikisource.org/wiki/%E5%AD%AB%E5%AD%90%E7%AE%97%E7%B6%93 Chinese Wikisource] 孫子算經: 先識其位，一從十橫，百立千僵，千十相望，萬百相當。 12. [[s:zh:夢溪筆談/卷08. Chinese Wikisource]], 夢溪筆談: 如算法用赤籌、黑籌，以別正負之數。 13. [http://zh.wikisource.org/wiki/%E4%B9%9D%E7%AB%A0%E7%AE%97%E8%A1%93 Chinese Wikisource] 正負術曰: 同名相除，異名相益，正無入負之，負無入正之。其異名相除，同名相益，正無入正之，負無入負之。 14. [[Karl Menninger (mathematics). Karl Menninger]], Number Words and Number Symbols, p 369, MIT Press, 1970 15. ["Chinese numerals"](https://mathshistory.st-andrews.ac.uk/HistTopics/Chinese_numerals/). 16. Christopher Cullen et John H. Jenkins, [https://www.unicode.org/L2/L2004/04227-count-rod.pdf ''Proposal to add Chinese counting rod numerals to Unicode and ISO/IEC 10646''], 2004 ::callout[type=info title="Wikipedia Source"] This article was imported from [Wikipedia](https://en.wikipedia.org/wiki/Counting_rods) and is available under the [Creative Commons Attribution-ShareAlike 4.0 License](https://creativecommons.org/licenses/by-sa/4.0/). Content has been adapted to SurfDoc format. Original contributors can be found on the [article history page](https://en.wikipedia.org/wiki/Counting_rods?action=history). ::

chinese-inventions chinese-mathematics japanese-mathematics korean-mathematics mathematical-tools numerals science-and-technology-in-china

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