napohualli.

Headword: 
napohualli.
Principal English Translation: 

80 (4 twenties)

Alonso de Molina: 

Nappoalli. ochenta.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, f. 63r.

Attestations from sources in English: 

yz ca yn imil chicuematli yz ca yn itequivh ce çotli canavac ya yxquich yn itequivh y napovaltica quicava çecotli [sic? meant çeçotli?] y cuavhnavacayotli yz ca yn itetlacualtil ce çotli canavac ya ixquich yn itequivh = Here is his field: 8 matl. Here is his tribute that he delivers every 80 days: one quarter-length of a Cuernavaca cloak each time. Here is his provisions tribute: one quarter-length of a narrow cloak. That is all of his tribute. (Cuernavaca region, ca. 1540s)
The Book of Tributes: Early Sixteenth-Century Nahuatl Censuses from Morelos, ed. and transl. S. L. Cline, (Los Angeles: UCLA Latin American Center Publications, 1993), 112–113.

nahui (4) combined with pohualli (20), having a multiplier effect