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Just like in English, Spanish cardinal numbers (números cardinales ) can be both nouns and adjectives. But before we get into that, let's learn how to say the numbers in Spanish from 0 to 100 (los números de cero a cien ).
The numbers from 21 to 29 use a combination of veinti- and a number from 1-9 (with no space in between).
Forming the numbers from 31 to 99 is a cinch. You just use a multiple of 10 plus the conjunction y and a number from 1 to 9.