Discussion
Each set of Napier’s bones consisted of ______ rods.
Answer: C
Correct answer: 11
A set of Napier’s bones comprised eleven rods - one index rod plus one for each digit, with the multiples of that digit engraved down its length. Laying the rods for the digits of a number side by side reduced multiplication to reading off partial products and adding them - and division to the same process in reverse. Napier described them in 1617.
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