[Jtsummers]

Huli seems to change (though using a common root?) the words for the small numbers (like 1, 2, 3) when they get applied to how many 15s have been counted. "one fifteen" is "nguira ni", where does "ni" come from? "two fifteen" is "ngui ki", "ki" from "kira", why'd "nguira" abbreviated?

It's regular in construction, but the words change and drop parts of the basic number without a particular pattern (as an outsider to the language). "kira" -> "ki" makes sense. "duria" -> "dauni" -> "dau" kind of makes sense, but adds an extra letter (how does the sound actually change?). "tebira" -> "tebone" -> "tebo". A pattern is forming. Drop the "r-" and replace it with an "n-" (except for some) and later drop the "n-".