Pay in 4 interest-free payments of $10.69 Learn more
Ships within 48 hours · Estimated delivery Jul 31 - Aug 5
built to last
and puzzle lovers
nor 10 has 4 as a factor
Designed by our founder Dave Janelle and handcrafted in our family workshop in Hudson
Napier's Bones | Handmade Wooden Math STEM Teaching Aid Add-ons:No built to lastNapier's Bones is a handcrafted wooden reproduction of the multiplication aid invented by John Napier in 1617. Before calculators, students and tradespeople used the marked rods to multiply, divide, and find roots. The base set ships with two complete sets of rods (0 9), a storage base, a wood cover, and printed instructions with worked examples. Optional square root or cube root bone add ons at checkout. Includes: storage base, 2 sets of rods 0 9,
US$ 44.00
US$ 44.00
US$ 44.00
US$ 44.00
US$ 49.99
US$ 44.00
US$ 44.00
US$ 44.00
US$ 49.99
US$ 49.99
US$ 55.00
US$ 44.00
US$ 44.00
US$ 49.99
