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First, use the four fingers of your right hand to count 1, 2, 3, 4. With Alexander’s photos of hands, and screenshots from an online Soroban abacus, I can show the idea. As I looked at that neat way of counting to 99 on your two hands, I finally understood Soroban! The four beads stand for the four fingers on your hand, and the separate bead for the thumb. In response to yesterday’s post Hand tricks! Alexander Bogomolny linked his page explaining finger 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?