Inca Counting Boards

This lesson explains how to use a counting board to determine basic computations.
Site: mathispower4u.com

[@user-mo1dh1xf2k]

Есть ли Япония Yopan

[@sumdumbmick]

why is your yupana schematic wrong, though? they always have 7 equally sized square-ish spots per side around the perimeter (you only have 6), one large central spot (you have this), two adjunct spots that are usually of an intermediate size (you either have this or you fucked up the 7th square-ish spot), and the raised section (you have this), which is variably divided into 1, 2, 3, 4 or more and possibly itself tiered.

[@sumdumbmick]

I'm also extremely confused as to why you're using duodecimal system when quipu appear to have used decimal and we have accounts that the two systems meshed with each other extremely well. employing a base conversion would hinder that to the point that it would simply be worthless.

[@user-mo1dh1xf2k]

Царь Супилима из Анатолии