As you can see, the numbers in the tens places have a strong resemblance to those in the ones places. For example, compare quatre (4) and quarante (40) or cinq (5) and cinquante (50). However, after sixty (soixante), there is a bit of a problem. There is not a single number which means seventy, instead you need to combine numbers together:
soixante-dix – 70 (literally sixty-ten)
soixante-onze – 71 (literally sixty-eleven)
soixante-douze – 72 (literally sixty-twelve) etc...
soixante-treize –73
soixante-quatorze – 74
soixante-quinze – 75
soixante-seize – 76
soixante-dix-sept – 77
soixante-dix-huit – 78
soixante-dix-neuf – 79
This pattern changes slightly when you reach eighty, which is quatre-vingts, or four-twenties:
quatre-vingts – 80 (four-twenties)
quatre-vingt-un – 81 (four-twenties and one)
quatre-vingt-deux – 82 (four-twenties and two)
Again, there is not a specific word for ninety, but rather :
quatre-vingt-dix – 90 (four-twenties and ten)
until finally you reach 99:
quatre-vingt-dix-neuf – (four-twenties and nineteen)