Numbers – Fractions
There are two ways to create fractions: using dedicated words such as hanner, half, or traean, third; or in a more mathematical context, using rhan o, part of, eg tair rhan o bedair, three parts of four or three quarters.
Plurals are given in brackets, and the pattern continues as established after two sixths, dau chweched.
‘Conversational’ fractions
| English | Welsh |
| half | hanner (haneri) |
| third | traean (traeanau) |
| two thirds | dau draean |
| quarter | chwarter (chwarteri) |
| two quarters | dau chwarter |
| three quarters | tri chwarter |
| fifth | pumed |
| two fifths | dau bumed |
| three fifths | tri phumed |
| four fifths | pedar pumed |
| six | chweched |
| two sixths | dau chweched |
‘Mathematical’ fractions
Note that in the rhan o construction rhan is feminine, therefore it is used with feminine numbers dwy, tair, pedair, with appropriate mutations. The pattern after seven sevenths continues as established.
| English | Welsh |
| one half | un rhan o ddwy |
| two halves | dwy ran o ddwy |
| one third | un rhan o dair |
| two thirds | dwy ran o dair |
| three thirds | tair rhan o dair |
| one quarter | un rhan o bedair |
| two quarters | dwy ran o bedair |
| three quarters | tair rhan o bedair |
| four quarters | pedair rhan o bedair |
| one fifth | un rhan o bump |
| two fifths | dwy ran o bump |
| three fifths | tair rhan o bump |
| four fifths | pedair rhan o bump |
| five fifths | pum rhan o bump |
| one sixth | un rhan o chwech |
| two sixths | dwy ran o chwech |
| three sixths | tair rhan o chwech |
| four sixths | pedwar rhan o chwech |
| five sixths | pum rhan o chwech |
| six sixths | chwe rhan o chwech |
| one seventh | un rhan o saith |
| two sevenths | dwy ran o saith |
| three sevenths | tair rhan o saith |
| four sevenths | pedair rhan o saith |
| five sevenths | pum rhan o saith |
| six sevenths | chwe rhan o saith |
| seven sevenths | saith rhan o saith |