The Barddas of Iolo Morganwg, Vol. I., ed. by J. Williams Ab Ithel, [1862], at sacred-texts.com
One,
Ten,
A hundred, ten tens,
A thousand, ten hundreds,
A myriad, ten thousands,
Mwnt, ten myriads,
Rhiallu, ten mwnts,
Mwnda, Buna, ten rhiallus,
Cattyrva, ten tyrvas,
Tyrva, ten bunas, or mwnda, to a
Cadrawd, ten cattyrvas.
These are called the ten degrees of Numerals; and it is from being acquainted with every movement and treatment of the numerals that every truth in respect of number, measure, and weight is known.