Definition:Number Names

Definition

This page gathers together instances of names of numbers in various languages and contexts.

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 $\dfrac 1 2 \times 100$).

There are a number of traditional system of numbers used for counting sheep in certain locales in the British Isles.

This is one example:

and so on.