Napier's Bones | Handmade Wooden Math STEM Teaching Aid skier gift Ken Irvine wrote the program

Ken Irvine wrote the program to develop the math layout on the blocks

if you roll and 4 and a 5

This is a puzzle designed for a Montessori group and intended for educational purposes as well as providing a meaningful puzzle challenge for any age

Browse more in our board games and family games collections

Exclusive Creation: Designed by George Sicherman and handcrafted in Hudson

Napier's Bones | Handmade Wooden Math STEM Teaching Aid skier gift Ken Irvine wrote the programNapier'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,