A Playground of Thoughts > Number Systems of the World > The Number System of Welsh (Traditional)

The Number System of Welsh (Traditional)


This page is based on Bilingualism and Number in Wales.

Welsh has two number systems, the traditional system shown below and the modern system, the latter becoming increasingly common.

The traditional system is basically vigesimal (base 20), but it calls 50 "half-hundred" and 19 "two-nine", and it also uses 15 as a reference point.

NumberReadingMeaning
0?-
1un1
2dau2
3tri3
4pedwar4
5pump5
6chwech6
7saith7
8wyth8
9naw9
10deg10
11un ar ddeg1 on 10*
12deuddeg2* + 10*
13tri ar ddeg3 on 10*
14pedwar ar ddeg4 on 10*
15pymtheg5* + 10*
16un ar bymtheg1 on (5* + 10*)
17dau ar bymtheg2 on (5* + 10*)
18deunaw2* × 9
19pedwar ar bymtheg4 on (5* + 10*)
20ugain20
21un ar hugain1 on 20*
22dau ar hugain2 on 20*
23tri ar hugain3 on 20*
24pedwar ar hugain4 on 20*
25pump ar hugain5 on 20*
26chwech ar hugain6 on 20*
27saith ar hugain7 on 20*
28wyth ar hugain8 on 20*
29naw ar hugain9 on 20*
30deg ar hugain10 on 20*
31un ar ddeg ar hugain1 on 10* on 20*
32deuddeg ar hugain(2* + 10*) on 20*
33tri ar ddeg ar hugain3 on 10* on 20*
34pedwar ar ddeg ar hugain4 on 10* on 20*
35pymtheg ar hugain(5* + 10*) on 20*
36un ar bymtheg ar hugain1 on (5* + 10*) on 20*
37dau ar bymtheg ar hugain2 on (5* + 10*) on 20*
38deunaw ar hugain(2* × 9) on 20*
39pedwar ar bymtheg ar hugain4 on (5* + 10*) on 20*
40deugain2* × 20*
41un a deugain1 and (2* × 20*)
42dau a deugain2 and (2* × 20*)
43tri a deugain3 and (2* × 20*)
44pedwar a deugain4 and (2* × 20*)
45pump a deugain5 and (2* × 20*)
46chwech a deugain6 and (2* × 20*)
47saith a deugain7 and (2* × 20*)
48wyth a deugain8 and (2* × 20*)
49naw a deugain9 and (2* × 20*)
50hanner cant½ × 100
51hanner cant a un(½ × 100) and 1
52hanner cant a dau(½ × 100) and 2
53hanner cant a tri(½ × 100) and 3
54hanner cant a pedwar(½ × 100) and 4
55hanner cant a pump(½ × 100) and 5
56hanner cant a chwech(½ × 100) and 6
57hanner cant a saith(½ × 100) and 7
58hanner cant a wyth(½ × 100) and 8
59hanner cant a naw(½ × 100) and 9
60thrigain3* × 20*
61un a thrigain1 and (3* × 20*)
62dau a thrigain2 and (3* × 20*)
63tri a thrigain3 and (3* × 20*)
64pedwar a thrigain4 and (3* × 20*)
65pump a thrigain5 and (3* × 20*)
66chwech a thrigain6 and (3* × 20*)
67saith a thrigain7 and (3* × 20*)
68wyth a thrigain8 and (3* × 20*)
69naw a thrigain9 and (3* × 20*)
70deg a thrigain10 and (3* × 20*)
71un ar ddeg a thrigain1 on 10* and (3* × 20*)
72deuddeg a thrigain(2* + 10*) and (3* × 20*)
73tri ar ddeg a thrigain3 on 10* and (3* × 20*)
74pedwar ar ddeg a thrigain4 on 10* and (3* × 20*)
75pymtheg a thrigain(5* + 10*) and (3* × 20*)
76un ar bymtheg a thrigain1 on (5* + 10*) and (3* × 20*)
77dau ar bymtheg a thrigain2 on (5* + 10*) and (3* × 20*)
78deunaw a thrigain(2* × 9) and (3* × 20*)
79pedwar ar bymtheg a thrigain4 on (5* + 10*) and (3* × 20*)
80phedwar ugain4* × 20
81un a phedwar ugain1 and (4* × 20)
82dau a phedwar ugain2 and (4* × 20)
83tri a phedwar ugain3 and (4* × 20)
84pedwar a phedwar ugain4 and (4* × 20)
85pump a phedwar ugain5 and (4* × 20)
86chwech a phedwar ugain6 and (4* × 20)
87saith a phedwar ugain7 and (4* × 20)
88wyth a phedwar ugain8 and (4* × 20)
89naw a phedwar ugain9 and (4* × 20)
90deg a phedwar ugain10 and (4* × 20)
91un ar ddeg a phedwar ugain1 on 10* and (4* × 20)
92deuddeg a phedwar ugain(2* + 10*) and (4* × 20)
93tri ar ddeg a phedwar ugain3 on 10* and (4* × 20)
94pedwar ar ddeg a phedwar ugain4 on 10* and (4* × 20)
95pymtheg a phedwar ugain(5* + 10*) and (4* × 20)
96un ar bymtheg a phedwar ugain1 on (5* + 10*) and (4* × 20)
97dau ar bymtheg a phedwar ugain2 on (5* + 10*) and (4* × 20)
98deunaw a phedwar ugain(2* × 9) and (4* × 20)
99pedwar ar bymtheg a phedwar ugain4 on (5* + 10*) and (4* × 20)
100cant100

* Different form


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