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John Napier invented his abacus rods in the early 17th century. Among other things, Napier's Rods can be used for multiplying two factors, and is an ingenious way ...
You'll need about a dozen craft sticks, a ruler, a pencil, and some other markers if you want to gussy up your sticks.
Start by measuring and marking half-inch increments on the craft sticks. I keep extra space at the top. First, make a guide rod, which makes the first column, ...
For all the digits zero through nine, make diagonal lines on the sticks from the top right to the bottom left.
You will then construct a times table for each digit. Multiply the stick's number -- the number at the top -- by the number on the guide stick ...
Napier's rods were a refinement of the Arab lattice method imported to Europe by Fibonacci. Add the place values in each parallelogram, carrying when necessary, and you have ...
How is the lattice method different from standard multiplication? Is it just a different way to project the carried digit? Can you make binary base rods? Joshf made ...
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