Modern Chadic numeral systems are sometimes decimal, having separate names for the numbers 1–10, and sometimes base-5, deriving the numbers 6–9 from the numbers 1–5 in some way.
mˈɑːdɚn tʃˈædɪk nˈuːmɚɹəl sˈɪstəmz ɑːɹ sˈʌmtaɪmz dˈɛsɪməl, hˌævɪŋ sˈɛpɹət nˈeɪmz fɚðə nˈʌmbɚz wˈʌn tˈɛn, ænd sˈʌmtaɪmz bˈeɪs fˈaɪv, dᵻɹˈaɪvɪŋ ðə nˈʌmbɚz sˈɪks nˈaɪn fɹʌmðə nˈʌmbɚz wˈʌn fˈaɪv ɪn sˌʌm wˈeɪ.