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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 change

Determiner change

Determiner
forty

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

Noun change

Singular
forty

Plural
forties

  1. The number 40.
    Four tens is forty.