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The Maya numeral system is a vigesimal (base-20) positional notation used in the Maya civilization to represent numbers. The numerals are made up of three symbols; zero (shell shape, with the plastron uppermost), one (a dot) and five (a bar) (quinary digits). For example, thirteen is written as three dots in a horizontal row above two horizontal lines stacked above each other.

400s
20s
1s
	33	429	5125

Numbers after 19 were written vertically in powers of twenty. For example, thirty-three would be written as one dot above three dots, which are in turn atop two lines. The first dot represents "one twenty" or "1×20", which is added to three dots and two bars, or thirteen. Therefore, (1×20) + 13 = 33. Upon reaching 20² or 400, another row is started (20³ or 8000, then 20⁴ or 160,000, and so on). The number 429 would be written as one dot above one dot above four dots and a bar, or (1×20²) + (1×20¹) + 9 = 429. The powers of twenty are numerals, just as the Hindu-Arabic numeral system uses powers of tens.^[1]

Other than the bar and dot notation, Maya numerals can be illustrated by face type glyphs or pictures. The face glyph for a number represents the deity associated with the number. These face number glyphs were rarely used, and are mostly seen on some of the most elaborate monumental carving.

Addition and subtraction: Adding and subtracting numbers below 20 using Maya numerals is very simple. Addition is performed by combining the numeric symbols at each level:

If five or more dots result from the combination, five dots are removed and replaced by a bar. If four or more bars result, four bars are removed and a dot is added to the next higher row.

Similarly with subtraction, remove the elements of the subtrahend symbol from the minuend symbol:

If there are not enough dots in a minuend position, a bar is replaced by five dots. If there are not enough bars, a dot is removed from the next higher minuend symbol in the column and four bars are added to the minuend symbol which is being worked on.

Zero

The Maya/Mesoamerican Long Count calendar required the use of zero as a place-holder within its vigesimal positional numeral system. A shell glyph – – was used as a zero symbol for these Long Count dates, the earliest of which (on Stela 2 at Chiapa de Corzo, Chiapas) has a date of 36 BC.^[2]

However, since the eight earliest Long Count dates appear outside the Maya homeland,^[3] it is assumed that the use of zero predated the Maya, and was possibly the invention of the Olmec. Indeed, many of the earliest Long Count dates were found within the Olmec heartland. However, the Olmec civilization had come to an end by the 4th century BC, several centuries before the earliest known Long Count dates—which suggests that zero was not an Olmec discovery.

In the calendar

In the "Long Count" portion of the Maya calendar, a variation on the strictly vigesimal numbering is used. The Long Count changes in the third place value; it is not 20×20 = 400, as would otherwise be expected, but 18×20, so that one dot over two zeros signifies 360. This is supposed to be because 360 is roughly the number of days in a year. (Some hypothesize that this was an early approximation to the number of days in the solar year, although the Maya had a quite accurate calculation of 365.2422 days for the solar year at least since the early Classic era.)^[4] Subsequent place values return to base-twenty.

In fact, every known example of large numbers uses this 'modified vigesimal' system, with the third position representing multiples of 18×20. It is reasonable to assume, but not proven by any evidence, that the normal system in use was a pure base-20 system.

References

^ Saxakali (1997). "Maya Numerals". Archived from the original on 2006-07-14. Retrieved 2006-07-29.
^ No long count date actually using the number 0 has been found before the 3rd century BC, but since the long count system would make no sense without some placeholder, and since Mesoamerican glyphs do not typically leave empty spaces, these earlier dates are taken as indirect evidence that the concept of 0 already existed at the time.
^ Diehl, Richard (2004). The Olmecs: America's First Civilization. London: Thames & Hudson. p. 186. ISBN 0-500-02119-8. OCLC 56746987.
^ Kallen, Stuart A. (1955). The Mayans. San Diego, CA: Lucent Books, Inc. p. 56. ISBN 1-56006-757-8.

External links

Maya Mathematics - online converter from decimal numeration to Maya numeral notation.
Anthropomorphic Maya numbers - online story of number representations.

[1] Saxakali (1997). "Maya Numerals". Archived from the original on 2006-07-14. Retrieved 2006-07-29.

[2] No long count date actually using the number 0 has been found before the 3rd century BC, but since the long count system would make no sense without some placeholder, and since Mesoamerican glyphs do not typically leave empty spaces, these earlier dates are taken as indirect evidence that the concept of 0 already existed at the time.

[3] Diehl, Richard (2004). The Olmecs: America's First Civilization. London: Thames & Hudson. p. 186. ISBN 0-500-02119-8. OCLC 56746987.

[4] Kallen, Stuart A. (1955). The Mayans. San Diego, CA: Lucent Books, Inc. p. 56. ISBN 1-56006-757-8.

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@@ Line 1: / Line 1: @@
 [[Image:maya.svg|thumb|right|Maya numerals]]
 {{Table Numeral Systems}}
-The '''Maya numeral system''' is a [[vigesimal]] (base-20) [[positional notation]] used in the [[Maya civilization]] to represent numbers. The numerals are made up of three symbols; [[Zero number#The Americas|zero]] ([[Turtle shell|shell]] shape, with the [[Turtle shell#Plastron|plastron]] uppermost), [[1 (number)|one]] (a dot) and [[5 (number)|five]] (a bar).  For example, thirteen is written as three dots in a horizontal row above two horizontal lines stacked above each other.
+The '''Maya numeral system''' is a [[vigesimal]] (base-20) [[positional notation]] used in the [[Maya civilization]] to represent numbers. The numerals are made up of three symbols; [[Zero number#The Americas|zero]] ([[Turtle shell|shell]] shape, with the [[Turtle shell#Plastron|plastron]] uppermost), [[1 (number)|one]] (a dot) and [[5 (number)|five]] (a bar) ([[quinary]] digits). For example, thirteen is written as three dots in a horizontal row above two horizontal lines stacked above each other.
 {| align="left" class="wikitable" style="text-align:center; margin-right:10px;"
@@ Line 10: / Line 10: @@
 | {{Horizontal Maya|12}}
 |-
-| 20s
+|20s
 | {{Horizontal Maya|1}}
 | {{Horizontal Maya|1}}
 | {{Horizontal Maya|16}}
 |-
-| 1s
+|1s
 | {{Horizontal Maya|13}}
 | {{Horizontal Maya|9}}
@@ Line 26: / Line 26: @@
 |}
 <br>
-Numbers after 19 were written  vertically in powers of twenty. For example, thirty-three would be written as one dot above three dots, which are in turn atop two lines. The first dot represents "one twenty" or "1×20", which is added to three dots and two bars, or thirteen. Therefore, (1×20) + 13 = 33. Upon reaching 20<sup>2</sup> or 400, another row is started (20<sup>3</sup> or 8000, then 20<sup>4</sup> or 160,000, and so on). The number 429 would be written as one dot above one dot above four dots and a bar, or (1×20<sup>2</sup>) + (1×20<sup>1</sup>) + 9 = 429. The powers of twenty are [[Numeral system|numerals]], just as the [[Hindu-Arabic numeral system]] uses powers of tens.<ref>{{cite web |url=http://saxakali.com/historymam2.htm |title=Maya Numerals |author=Saxakali |year=1997 |accessdate=2006-07-29 |archiveurl = https://web.archive.org/web/20060714025120/http://www.saxakali.com/historymam2.htm |archivedate = 2006-07-14}}</ref>
+Numbers after 19 were written vertically in powers of twenty. For example, thirty-three would be written as one dot above three dots, which are in turn atop two lines. The first dot represents "one twenty" or "1×20", which is added to three dots and two bars, or thirteen. Therefore, (1×20) + 13 = 33. Upon reaching 20<sup>2</sup> or 400, another row is started (20<sup>3</sup> or 8000, then 20<sup>4</sup> or 160,000, and so on). The number 429 would be written as one dot above one dot above four dots and a bar, or (1×20<sup>2</sup>) + (1×20<sup>1</sup>) + 9 = 429. The powers of twenty are [[Numeral system|numerals]], just as the [[Hindu-Arabic numeral system]] uses powers of tens.<ref>{{cite web |url=http://saxakali.com/historymam2.htm |title=Maya Numerals |author=Saxakali |year=1997 |accessdate=2006-07-29 |archiveurl = https://web.archive.org/web/20060714025120/http://www.saxakali.com/historymam2.htm |archivedate = 2006-07-14}}</ref>
 Other than the bar and dot notation, Maya numerals can be illustrated by face type glyphs or pictures. The face glyph for a number represents the deity associated with the number. These face number glyphs were rarely used, and are mostly seen on some of the most elaborate monumental carving.
@@ Line 48: / Line 48: @@
 ==In the calendar==
-[[Image:La Mojarra Inscription and Long Count date.jpg|thumb|200px|right|Detail showing three columns of glyphs from [[La Mojarra Stela 1]].  The left column uses Maya numerals to show a Long Count date of 8.5.16.9.7, or 156 CE.]]
+[[Image:La Mojarra Inscription and Long Count date.jpg|thumb|200px|right|Detail showing three columns of glyphs from [[La Mojarra Stela 1]]. The left column uses Maya numerals to show a Long Count date of 8.5.16.9.7, or 156 CE.]]
-In the "Long Count" portion of the [[Maya calendar]], a variation on the strictly vigesimal numbering is used. The Long Count changes in the third [[positional notation|place value]]; it is not 20×20 = 400, as would otherwise be expected, but 18×20, so that one dot over two zeros signifies 360.  This is supposed to be because 360 is roughly the number of days in a [[year]]. (Some hypothesize that this was an early approximation to the number of days in the [[solar year]], although the Maya had a quite accurate calculation of 365.2422 days for the solar year at least since the early [[Maya civilization#Classic period|Classic era]].)<ref>{{cite book | title=The Mayans | publisher=Lucent Books, Inc. | author=Kallen, Stuart A. | year=1955 | location=San Diego, CA | pages=56 | isbn=1-56006-757-8}}</ref> Subsequent place values return to base-twenty.
+In the "Long Count" portion of the [[Maya calendar]], a variation on the strictly vigesimal numbering is used. The Long Count changes in the third [[positional notation|place value]]; it is not 20×20 = 400, as would otherwise be expected, but 18×20, so that one dot over two zeros signifies 360. This is supposed to be because 360 is roughly the number of days in a [[year]]. (Some hypothesize that this was an early approximation to the number of days in the [[solar year]], although the Maya had a quite accurate calculation of 365.2422 days for the solar year at least since the early [[Maya civilization#Classic period|Classic era]].)<ref>{{cite book | title=The Mayans | publisher=Lucent Books, Inc. | author=Kallen, Stuart A. | year=1955 | location=San Diego, CA | pages=56 | isbn=1-56006-757-8}}</ref> Subsequent place values return to base-twenty.
 In fact, every known example of large numbers uses this 'modified vigesimal' system, with the third position representing multiples of 18×20. It is reasonable to assume, but not proven by any evidence, that the normal system in use was a pure base-20 system.
@@ Line 57: / Line 57: @@
 ==Further reading==
-{{refbegin|indent=yes}}<!-- BEGIN biblio style.  If indent param. is used, Pls use a colon (:) instead of asterisk (*) for bullet markers in the references list -->
+{{refbegin|indent=yes}}<!-- BEGIN biblio style. If indent param. is used, Pls use a colon (:) instead of asterisk (*) for bullet markers in the references list -->
 * {{cite book |last=Coe |first=Michael D. |authorlink=Michael D. Coe |year=1987 |title=The Maya |publisher=Thames & Hudson |location=London; New York |edition=4th edition (revised) |isbn=0-500-27455-X |oclc=15895415}}
 * {{cite journal |last=Díaz Díaz |first=Ruy |date=December 2006 |title=Apuntes sobre la aritmética Maya |url=http://www.scielo.org.ve/scielo.php?script=sci_arttext&pid=S1316-49102006000400007&lng=en&nrm=iso&tlng=es |format=online reproduction |journal=Educere |volume=10 |issue=35 |pages=621–627 |location=Táchira, Venezuela |publisher=[[University of the Andes, Venezuela|Universidad de los Andes]] |issn=1316-4910 |oclc=66480251|language=es}}