Napier's Bones

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In the seventeenth century, John Napier invented a method to perform multiplication using small rectangular pieces of bone labeled with numbers. Select a digit and a number
with at most four digits; to multiply them, put the columns with each digit of
at the top of the columns after the first. Each column consists of multiples of those top numbers by
, with digits placed in the corners of the squares. Go down the first column to the digit
. Look at the red rectangle to its right; to get the answer, add the digits between the diagonals as shown by the arrows.
Contributed by: Enrique Zeleny (March 2011)
Open content licensed under CC BY-NC-SA
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"Napier's Bones"
http://demonstrations.wolfram.com/NapiersBones/
Wolfram Demonstrations Project
Published: March 7 2011