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5 (out of 5)
originally designed in the 1800s
it’s a puzzle that’s as stunning as it is challenging
Alzheimer's disease
Made in the USA by Creative Crafthouse®
Napier's Local Arithmetic Board | STEM Montessori Math Learning Tool whiskey gift 5 (out of 5)John Napier was a brilliant Scottish mathematician who lived from 1550 to 1617. He developed a number of methods to simplify mathematic operations most notably logarithms but also some calculation tools like Napiers Bones and this Local Arithmetic Board. This board will allow the calculation of 2 numbers, though each number must be less than 512. It's an amazing thing to use this board and get a sense of the history as well as the mathematics behind
