ABACUS: MYSTERY OF THE BEAD

THE BEAD UNBAFFLED - An Abacus Manual

- Totton Heffelfinger & Gary Flom

▪ History  ▪ Abacus Techniques  ▪ Addition  ▪ Subtraction  ▪ Multiplication  ▪ Division 
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Abacus: Mystery of the Bead
© 2004 - 2007 by Totton Heffelfinger & Gary Flom