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The Simple English Wikipedia has an article on:
English numbers (edit)
400
 ←  30  ←  39 40 41  →  50  → 
4
    Cardinal: forty
    Ordinal: fortieth

Pronunciation

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Determiner

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Determiner
forty

  1. (number) (indefinite) (plural) (count) (ordinal fortieth) The number 40.
    He was forty minutes late.

Singular
forty

Plural
forties

  1. The number 40.
    Four tens is forty.