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Abacus Soboran Japanese Math Homeschool Manual How to use
Abacus Lesson 1 // Introduction, Proper Technique, & History of the Abacus // Tutorial
Abacus Lesson 1 // Introduction, Proper Technique, & History of the Abacus // Tutorial - YouTube
soroban
Japanese abacus -soroban- そろばん
Soroban abacus and finger math - Natural Math
Soroban Math - Have you ever wondered why the Oriental Soroban abacus has 4 separate beads? It is in base 10, not 4 or 5, so why organize it that way? In response to yesterday’s post Hand tricks! Alexander Bogomolny linked his…Read more ›