Gwandara language

Gwandara
Spoken in  Nigeria
Native speakers 30 thousand  (date missing)
Language family
Afro-Asiatic
Language codes
ISO 639-3 gwn

Gwandara is a West Chadic language, and the closest relative of Hausa. Its several dialects are spoken in northern Nigeria by about 30,000 people. [1]

The Nimbia dialect has a duodecimal numeral system, whereas other dialects, such as Karshi below, have decimal systems:[2]

1 2 3 4 5 6 7 8 9 ten eleven twelve
Nimbia da bi ugu furu biyar shide bo'o tager tanran gwom kwada tuni
Karshi da bi uku huru biyari shida bakwe takushi tara gom gom sha da gom sha bi

It is thought that Nimbia acquired its duodecimal system from the Plateau languages to the east. It is duodecimal even to powers of base twelve:

tuni mbe da 13 (dozen and one)
gume bi 24 (two dozen)
gume bi ni da 25 (two dozen and one)
gume kwada ni kwada 143 (eleven dozen and eleven)
wo 144 (gross)
wo bi 288 (two gross)

References