Two morphological formations are found: cardinal + eer for 2nd-6th and cardinal + da for 7th and beyond. The first affix occurs only with numerals; the second is found in apparently frozen constructions with a few other nouns. Traces of former suppletive forms for 2nd-6th are found in the names of the days of the week: sindafara ‘Monday’ (< segunda-feira), tɛrsafara ‘Tuesday’ (< terça-feira), kartafara ‘Wednesday’ (< quarta-feira), kintafara ‘Thursday’ (< quinta-feira), sestafara ‘Friday’ (< sesta-feira).
Source: Smith 1974-5: passim
Source: Smith 1974-5: 4044