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The Simple English Wikipedia has an article on:
English numbers (edit)
500
 ←  40  ←  49 50 51  →  60  → 
5
    Cardinal: fifty
    Ordinal: fiftieth

Pronunciation change

Determiner change

Determiner
fifty

  1. (number) (indefinite) (plural) (count) (ordinal fiftieth) The number 50.
    There were fifty people in my class.

Noun change

Singular
fifty

Plural
fifties

  1. The number 50.
    Five tens is fifty.