Numbers in Spanish are always singular. Plural forms of numbers don't exist. Look at the examples below. The noun is plural (houses, children, friends), but the number is not (five, ten, three).

cinco casas - five houses
diez niños - ten children
tres amigos - three friends

The number "one" has both a masculine and a feminine form "uno" and "una". For example:

sólo uno de tus amigos
- just one of your friends
sólo una noche
- just one night

Other numbers do not change for gender.
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Review the vocabulary to the right and listen to how these words are used in the Sentence Flashcards and Videos.