Gwandara language

The Gwandara people are one of the indigenous tribes of FCT Abuja, the capital city of Nigeria.

The Nimbia dialect has a duodecimal numeral system (they count in base 12), 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: The Nimbia 12 number set number system is known for making division easier.