On COMPARISON 01 you learned how to say 'more...than', 'less...than', 'good, better, best' and 'bad, worse, worst'. Those forms are generally used for 'adjectives', the words that describe 'nouns'.
However there's also sometimes a need to say 'more...than', 'fewer...than' with regard to "quantities" of nouns - so we use 'plus de ... que' ('de' doesn't change, here), or 'moins de ... que' for 'fewer' (again, 'de' doesn't change), or 'autant de ... que' for 'as many as' ('de' doesn't change here, either).
|She has more cars than me. (than I do)
||Elle a plus de voitures que moi.|
|I have fewer cars than she has. (than she does)
||J'ai moins de voitures qu'elle.|
|She has more cars than bicycles.
||Elle a plus de voitures que de bicyclettes.|
|He has as many cars as bicycles.
||Il a autant de voitures que de bicyclettes.|
Note the following:
|I go ski-ing as much as he does.
||Je fais du ski autant que lui.|
|The restaurant is as expensive as the night-club.
||Le restaurant est aussi cher que la boîte de nuit.|