Napier's Bones | Handmade Wooden Math STEM Teaching Aid
4.5 (1,234)
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$42.75
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Black
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Napier's Bones is a handcrafted wooden reproduction of the multiplication aid invented by John Napier in 1617. Before calculators, students and tradespeople used the marked rods to multiply, divide, and find roots. The base set ships with tw...
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5.0
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Was a gift for my son inlaw who is a mathematician and collects calculations.