Napier's Bones | Handmade Wooden Math STEM Teaching Aid family game night The trick reveals only with

The trick reveals only with the right math

Each set ships with the trick explained

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This puzzle and puzzle design are registered trademarks of The Sam Loyd Company and used by permission

Ours shares the name and the fun of dropping a coin

Napier's Bones | Handmade Wooden Math STEM Teaching Aid family game night The trick reveals only withNapier'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 two complete sets of rods (0 9), a storage base, a wood cover, and printed instructions with worked examples. Optional square root or cube root bone add ons at checkout. Includes: storage base, 2 sets of rods 0 9,