Description

Woods are 1/4" thick

The resulting letter or number on the other gear(s) could be the answer

Engrave a name or short message on the block (up to 45 characters)

Solid Wood Craftsmanship

Napier's Bones | Handmade Wooden Math STEM Teaching Aid Add-ons:Cube Root Bone Woods are 1/4" thickNapier'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,

Exchange/Return Notes