in English is:

arithmetic

Mutations

Soft:rifyddeg
Nasal:(no mutation)
Aspirate:(no mutation)

Use

y rhifyddeg hon
fy rhifyddeg i
dy rifyddeg di
ei rifyddeg ef/o
ei rhifyddeg hi
ein rhifyddeg ni
eich rhifyddeg chi
eu rhifyddeg nhw/hwy
Phrases (1)
rhifyddeg pen
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