The numbers 11–19 are formed by adding 1–9 to 10 by means of the conjunction "mbɔ", e.g. "kɛmbɔnunu", "eleven", "kɛmbɔkunɔ", "fifteen". In the tens and higher, the Nafaanra and Supyire systems diverge. Multiplication of "fulo", "twenty," and addition of "kɛ", "ten", (by means of the conjunction "ná") is used to form the 30–90 tens. Perhaps surprisingly, there are considerable differences between Rapp (1933) and Jordan (1980) here. In Rapp's 60, 70 and 80, "féle" seems to be used to mark ten, which conjoined with 6, 7 and 8 forms 60, 70 and 80.