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.The Nimbia dialect has a duodecimal numeral system, whereas other dialects, such as Karshi below, have decimal systems:It is thought that Nimbia, which is isolated from the rest of Gwandara, acquired its duodecimal system from neighboring East Kainji languages. It is duodecimal even to powers of base twelve: