_Tontamen_, the square of 20, is a simple word, and 1000 is, as it should be, 2 times 400, plus 200.

It is most unfortunate that the numeral for 8000, the cube of 20, is not given.
CORA.[369] 10.

tamoamata.
20.

cei-tevi.
30.

ceitevi apoan tamoamata = 20 + 10.
40.