Napier's bones

High school (ages 12+)
Mathematics & Numbers

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Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/napiers-bones

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. Who invented Napier's bones?Logarithms
2. What is the inventor?John Napier
3. What is the year of publication?1617
4. How do Napier's Bones help with multiplication?To multiply, you pick the rod for each digit, look at the row for the multiplier, add the numbers diagonally, and carry over any tens. This turns multiplication into a series of easier additions.
5. Can Napier's Bones be used for division or square roots?Yes, the same lattice can be used for division by subtracting, and it can even help find square roots. It works by breaking the problem into smaller steps.

Rabdology: The art of calculation using rods, a term coined by John Napier.
Lattice Multiplication: A method of multiplication that uses a grid to break down multi-digit problems into simpler steps.
Logarithms: A mathematical function that simplifies multiplication and division by converting them into addition and subtraction.
Manual Calculating Device: A tool operated by hand to perform mathematical computations.