The cardinals from 5 to 199 are indeclinable; from 200 the cardinals, and all the ordinals from first on, are declined like ἀγαθός.
a. Compound numbers above 20 are expressed by placing the smaller number first (with καί) or the larger number first (with or without καί).
| δύο καὶ εἴκοσι (ν) two and twenty | δεύτερος καὶ εἰκοστός |
| εἴκοσι καὶ δύο twenty and two, or εἴκοσι δύο twenty-two | εἰκοστὸς καὶ δεύτερος |
| 555 = πέντε καὶ πεντήκοντα καὶ πεντακόσιοι or πεντακόσιοι | (καὶ) πεντήκοντα (καὶ) |
| πέντε. |
b. For 21st, 31st, etc., εἷς (for πρῶτος) καὶ εἰκοστός (τριᾱκοστός) is permissible, but otherwise the cardinal is rarely thus joined with the ordinal.
c. Compounds of 10, 20, etc., with 8 and 9 are usually expressed by subtraction with the participle of δέω lack, as 18, 19, δυοῖν (ἑνὸς) δέοντες εἴκοσι. So ναυσὶ μιᾶς δεούσαις τεττάρακοντα with 39 ships, δυοῖν δέοντα πεντήκοντα ἔτη 48 years; and with ordinals ἑνὸς δέον εἰκοστὸν ἔτος the 19th year. The same method may be employed in other numbers than 8's or 9's: ἑπτὰ ἀποδέοντες τριᾱκόσιοι, i.e. 293.
d. An ordinal followed by ἐπὶ δέκα denotes the day of the month from the 13th to the 19th, as πέμπτῃ ἐπὶ δέκα on the 15th.