Welsh

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Welsh numbers (edit)
200
[a], [b] ←  10 [a], [b], [c] ←  19 20 21  → [a], [b] 30  → [a], [b], [c]
2[a], [b]
    Cardinal (decimal): dau ddeg, (optionally before a nasal or vowel) dau ddeng
    Cardinal (vigesimal): ugain
    Ordinal: ugeinfed
    Ordinal abbreviation: 20fed

Etymology

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From dau (two) +‎ deg (ten).

Pronunciation

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Numeral

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dau ddeg

  1. (cardinal number, decimal) twenty
    Synonym: ugain

Usage notes

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  • Decimal dau ddeg (twenty) is not to be confused with vigesimal deuddeg (twelve).

Mutation

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Welsh mutation
radical soft nasal aspirate
dau ddeg ddau ddeg nau ddeg unchanged
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.