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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

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Determiner

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Determiner
fifty

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

Singular
fifty

Plural
fifties

  1. The number 50.
    Five tens is fifty.