Definition:Number Names/Welsh

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Definition

These are the names of the numbers in Welsh:

\((1)\)   $:$   un      
\((2)\)   $:$   dau, dwy      
\((3)\)   $:$   toi, tair      
\((4)\)   $:$   pedwar, pedair      
\((5)\)   $:$   pump (or pum)      
\((6)\)   $:$   chwech (or chwe)      
\((7)\)   $:$   saith      
\((8)\)   $:$   wyth      
\((9)\)   $:$   naw      
\((10)\)   $:$   deg      
\((11)\)   $:$   un ar ddeg      
\((12)\)   $:$   deuddeg      
\((13)\)   $:$   toi ar ddeg, tair ar ddeg      
\((14)\)   $:$   pedwar ar ddeg, pedair ar ddeg      
\((15)\)   $:$   pymtheg      
\((16)\)   $:$   un ar bymtheg      
\((17)\)   $:$   dau ar bymtheg, dwy ar bymtheg      
\((18)\)   $:$   deunaw      
\((19)\)   $:$   pedwar ar bymtheg, pedair ar bymtheg      
\((20)\)   $:$   ugain      
\((30)\)   $:$   deg ar hugain      
\((40)\)   $:$   dugain      
\((50)\)   $:$   deg ar deugain or hanner cant      
\((60)\)   $:$   trigain      
\((70)\)   $:$   trigain a deg or deg ar thrigain      
\((80)\)   $:$   pedwar ugain      
\((90)\)   $:$   pedwar ugain a deg or deg a phedwar ugain      
\((100)\)   $:$   cant      

The different forms for $2$, $3$, $4$ and their derivatives are for masculine and feminine.

The different forms for $5$ and $6$ are elisions for use in front of certain letters.

The different forms for $50$, $70$ and $90$ are separate ways of saying the numbers.


Note:

there are no distinct words for $11$ and $12$, indicating that there has been less influence of duodecimal systems on Welsh
there are clear indications of base $5$ and vigesimal influences as well as decimal
the interesting forms for $18$ (expressed as $2 \times 9$) and $50$ (expressed both as $10 + 40$ and $\dfrac 1 2 \times 100$).


Sources