# Talk:Maya numerals

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==Mistakes==start Did the Maya people make many mistakes between, say, 6 and 25? Sabbut 08:04, 26 May 2004 (UTC)

No. Our current illustration is perhaps not that good at showing how the place value is seperated. More usually the numbers were rotated 90 degrees from what is shown, while the place value seperation was vertical.
So, for example, using a "0" as a dot and a "I" as a bar, six would be:
0I
Where as 25 would be:
0
I
Cheers, -- Infrogmation 15:40, 26 May 2004 (UTC)

In glyphic representation of the numbers, the shape of each glyph being roughly the same size is enough to distinguish between various levels of the vegisimal system. I believe that during calculations, they used beads in some sort of abacus. Dylanwhs 20:32, 26 May 2004 (UTC)

## Gnomon edits

I started to make some clean-up edits to User:Gnomon's recent additions to this page, but on consideration I am going to revert much of it. A good deal of it seems to me to be wrong. Thanks for your work here, Gnomon, but could we please have a source for some of this? For example:

"Most of what we know about Mayan numbers comes from a single document, the Dresden Codex"

What about the other pre-Columbian codicies, the stelae and other stone monuments, painting, and pottery which also use Maya numbers? They were still in use in the early colonial era, and for example Landa wrote about the numbers.

That the calendar uses non-vigesimal values IMO no more justifies claiming the system was not base 20 than the fact that we use clock faces with 12 digits means we don't really use base 10. -- Infrogmation 15:17, 9 Feb 2005 (UTC)

I'll check my sources and get back to you -- Gnomon.

I've looked into this and find that there were two systems in use by the Mayans. A pure base-20 system was used for normal purposes, but it did not use the numerals given here in this article. (Unfortunately, the numerals used have been destroyed by the invading Spanish, but it would have used a single symbol repeated as many times as necessary for 1's, another symbol repeated as many times as necessary for 10's, another for 100's and so on). The system described here was only used in the calendar codices and in stone inscriptions, and always used a mixed 18/20. Source: A Universal History of Numbers, Georges Ifrah.

I'll try and write that up and get it into the article.

## Sacred numbers

I've heard that there were sacred numbers in Mayan numbers. If this is true please tell me the numbers.

I'd say all numbers were sacred, with their own associated deities. -- Infrogmation 05:10, 13 August 2005 (UTC)

I've removed the following section, as it gives a misleading account which implies add & subtract operations can be achieved simply by shuffling around the dots and bars of the operands:

Obviously, this method only works for certain combinations of operands- while for example 5 + 8 works as indicated, 4 + 8 does not (you would end up with a bar and seven dots, five of which would need to be converted to a bar to get the correct representation of the result, 12).

Similarly, if the operation was 13 - 4, the result cannot be achieved simply by 'taking away' four dots.--cjllw ʘ TALK 03:58, 20 April 2007 (UTC)

## Mayan numerals in modern writing

Mayan numerals can be represented in modern writing similar to hexadecimal as:

0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,10,11,12,13,14,15,16,17,18,19,1A,1B,1C,1D,1E,1F,1G,1H,1I,1J,20

and so on. 83.5.64.57 17:43, 10 May 2007 (UTC)

Perhaps so, but they would then not be 'Maya numerals', but a representation of (any) base-20 system.--cjllw ʘ TALK 08:41, 11 May 2007 (UTC)

## Multiplication Division?

Was there a way to multiply or divide using this sytem? Maybe adding together one row at a time with the second column? (Example 21 Two dots ontop of one another time just two dots on the bottom the bottom dot goes with the other bottom dot to make 2 then that dot goes up (to nothing) and becomes a dot ontop of ther other dot, then you move on to the 20's row and get that dot move up the second column and add it together so you have two dots on the second row in the third column? .. x : = ::?) --199.227.86.10 14:49, 23 August 2007 (UTC)14:48, 23 August 2007 (UTC)

In a television show in Norway 2011-09-11 a very simple Maya way of multiplication was presented. Does anybody know this method? Hogne (talk) 12:44, 13 September 2011 (UTC)

## mayan number 0

The mayan number system did the '0' 300 years before the hindu-arabic. The zero is one concha —Preceding unsigned comment added by 189.69.29.89 (talk) 22:42, 23 March 2009 (UTC)

## 6 vs. 25

What's the difference between 6 and 25 in this system?? Both are a dot above a line. Georgia guy (talk) 23:12, 28 May 2009 (UTC)

See the answer given previously above. To represent the number 6, both the dot and bar occupy the 'same' position (the lowest unit position). For 25, the dot occupies the next-highest position, while the bar the lowest position. See this crude illustration, here the first-place units (base-20) are on the bottom row, while row above that one contains coefficients (n) for the next-highest place (n × 20 ):
 place-value 06 25 n × 201 • n × 200 •
However, the vast majority of numbers appearing in Maya inscriptions are in the context of calendrical data and calculations, and for those they did not need to go above 19.--cjllw ʘ TALK 01:06, 29 May 2009 (UTC)

I added a rough sentence, and I don't have the time to expand, but I think it's worth noting that the basic rules for addition/subtraction/etc described are the same in mayan numerals compared to traditional base-10 math. That might help people to see that this isn't such a "strange" system after all. I'll leave it up to you folks to find sources/whatever, and expand/elaborate/etc if you deem it necessary. 97.122.97.134 (talk) 05:58, 12 April 2010 (UTC)

## Number Representation

As far as I am aware, the Mayan number system was not entirely base 20. This page does not accurately reflect that. Numbers were represented as: ___ x 18 x 20^2 + ___ x 18 x 20 + ___ x 20 + ___ I see that this is represented in the calendar section, but believe it only adds confusion about the entire number system. Surely there is a solid reference to clarify if they used the strict base-20 system more often? Source: Crest of the Peacock, 3rd edition, page 67 (can be seen on Google Books) Levells (talk) 16:10, 7 May 2011 (UTC)

No. The number system was indeed base 20. The calendar made an exception for an approximation of the number of days in the year. Infrogmation (talk) 20:45, 7 May 2011 (UTC)
That's right, don't confuse calendrics with the actual arithmetic. Dylanwhs (talk) 09:18, 9 May 2011 (UTC)