Between 20 and 69, the numbers follow the same pattern:
20: vingt -> 23: vingt-trois
40: quarante -> 41: quarante et un
Note: No hyphen with 'et'
70 = soixante-dix
In French, we actually say "sixty-ten" (60 + 10) to express 'seventy'.
71 = 60 + 11 = soixante et onze (No hyphen)
72 = 60 + 12 = soixante-douze
73 = 60 + 13 = soixante-treize
74 = 60 + 14 = soixante-quatorze
75 = 60 + 15 = soixante-quinze
76 = 60 + 16 = soixante-seize
77 = 60 + 17 = soixante-dix-sept
78 = 60 + 18 = soixante-dix-huit
79 = 60 + 19 = soixante-dix-neuf
80 = quatre-vingts
In French, to express 'eighty', we actually say "four-twenties"
(4 x 20).
Note that quatre-vingts takes an 's' when on its own, but the 's' disappears when it is followed by another number.
85 = quatre-vingt-cinq
89 = quatre-vingt-neuf
Note also that 81 does "quatre-vingt-un" with no et inbetween.
90 = quatre-vingt-dix
As for seventy, ninety becomes "eighty-ten" (80 + 10) in French.
91 = 80 + 11 = quatre-vingt-onze (Note: NO et, just like 81)
92 = 80 + 12 = quatre-vingt-douze
93 = 80 + 13 = quatre-vingt-treize
94 = 80 + 14 = quatre-vingt-quatorze
95 = 80 + 15 = quatre-vingt-quinze
96 = 80 + 16 = quatre-vingt-seize
97 = 80 + 17 = quatre-vingt-dix-sept
98 = 80 + 18 = quatre-vingt-dix-huit
99 = 80 + 19 = quatre-vingt-dix-neuf
Numbers + nouns
Note that to say how many things there are, you simply use the number + thing (plural after 1), for numbers up to 999.
For larger numbers, see lesson Expressing large numbers: thousands, millions and billions
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