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WikiProject Mathematics (Rated Start-class, Low-importance)
WikiProject Mathematics
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Mathematics rating:
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 Field: Basics

I just got a new calculator, Sharp EL-531WH, which supports base-5. They call it Pental. I wonder what the uses are. Anyway, maybe a redirect page for Pental should be created? KMS 13:09, 28 July 2007 (UTC)

A quick search finds many references for this usage; so I put the redirect in. As for its uses, a few discussions on the internet came to the reasonable conclusion it is used to help students comprehend the japanese abacus. Marcus erronius (talk) 19:22, 18 December 2010 (UTC)

"only true 5-25" language known"[edit]

The Luiseño language also uses pure base 5 counting for numbers between 25 and 100, according to Native American Mathematics by Michael P. Closs. (ISBN 0-292-75531-7), though sometimes either a count by 25s or a count by 20s can be used... -- AnonMoos (talk) 22:21, 4 July 2008 (UTC)


I suggest the notability issue is discussed at category talk:Positional numeral systems#Notability.--Noe (talk) 09:54, 23 October 2009 (UTC)


I may sound dumb but I was told that is base number systems the number that it is a base of isn't part of the order. The Gumatj numerals are 1-5 so wouldn't that be base 6? Zebudster (talk) 19:20, 26 October 2010 (UTC)

You are correct that a base 5 number system won’t have a digit for 5. Close inspection of the table will reveal that they cound from 1 to 4 using 1s, the 5 to 25 using 5s, then 25 to 125 using 25s. This is equivalent to counting by tens and hundreds, but with fives and 25s, respectively. Marcus erronius (talk) 19:22, 18 December 2010 (UTC)
The fact that 5 alone is "wanggany rulu" (1 0) and not "dambumirri" (seen in the higher numbers as a single word for 5) seems to imply that the Gumatj speakers had an understanding of place value(!), which the Europeans took so long to find (and only then with some outside help, I think)! This understanding must also have been very basic to have affected the spoken(!!) language! This is very interesting and should certainly be expounded upon, and not passed over without comment in the article! Double sharp (talk) 11:47, 4 April 2013 (UTC)

alternative name[edit]

i was thinking apart from you guys and I thought that the name "pental" would be better. — Preceding unsigned comment added by (talk) 01:01, 2 January 2014 (UTC)