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→The Fraction abacus
How many ways can you make 1/2, remember you can use 2 strings eg. 1/3 + 1/6 = 1/2
How many ways can you make 1/2, remember you can use 2 strings eg. 1/3 + 1/6 = 1/2
[[File:Abacus3p6.jpg]]
Find all the ways to make 1/3 and 2/3
Find all the ways to make 1/3 and 2/3
===The Caacupé abacus===
===The Caacupé abacus===