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Nepohualtzintzin, a Mayan abacus based on 20.

Nepohualtzintzin, a Mayan abacus based on 20. "The Nepohualtzintzin is divided in two main parts separated by a bar or intermediate cord. In the left part there are four beads, which in the first row have unitary values (1, 2, 3, and 4), and in the right side there are three beads with values of 5, 10, and 15 respectively. In order to know the value of the respective beads of the upper rows, it is enough to multiply by 20 (by each row), the value of the corresponding account in the first row. Altogether, there are 13 rows with 7 beads in each one, which makes up 91 beads in each Nepohualtzintzin."

[[Category:Sugar Activity]]

[[Category:Sugar Activity]]