abacus

/Tag: abacus
16 09, 2017

West Asian mathematics – history of math

By |2019-09-04T05:49:16-07:00September 16th, 2017|West Asia|0 Comments

History of math: Sumerian multiplication table (2700 BC) Cuneiform multiplication table Once people in West Asia figured out how to write down numbers, about 3500 BC, they quickly began to want to use cuneiform to write down other mathematical ideas. (Read more about the invention of numbers) The earliest example of this that we have is from about 2700 BC. It [...]

4 09, 2017

Roman numeral answers – Roman math

By |2017-09-04T21:37:29-07:00September 4th, 2017|Math, Romans|0 Comments

Roman tax collector calculating someone's taxes on an abacus (Metz, ca. 225 AD) Did you figure it out? Poor Claudia died when she was 25 years old, seven months, and fourteen days. It's very likely that she died giving birth to a baby, though it could have been dysentery or cancer or another [...]

4 08, 2017

Medieval math in Europe

By |2017-08-04T13:22:07-07:00August 4th, 2017|Math, Medieval|0 Comments

Math was a very exciting subject to be working on during the Middle Ages in Europe. Little by little, math experts in Europe were learning from Islamic math experts about what we call Arabic numbers (0,1,2,3,4,5,6,7,8,9) (though the numbers came originally from India). Leaning Tower of Pisa (built while Fibonacci was a child) The first of these experts was Adelard [...]

29 07, 2017

A number line is infinite in both directions. Adding numbers is like walking along a path, the number line. To add two small numbers, like 7 + 4, you can just start from the 7 and walk forward 4 spaces, and then see where you are on the number line, and there you are [...]

9 06, 2017

How to make an abacus – Ancient China project

By |2019-01-15T08:54:03-07:00June 9th, 2017|China, Crafts, Science|0 Comments

Chinese abacus project, made by kids at Laurelhurst School, Portland, Oregon Who invented the abacus? People in China started to use an abacus to help them with math problems maybe as early as 500 BC. Nobody knows whether somebody in China invented the abacus. Maybe they learned about it from people in the [...]

7 06, 2017

Math and Numbers in Ancient China

By |2019-10-15T09:08:44-07:00June 7th, 2017|China, Science|0 Comments

Chinese numbers: number rods Chinese numbers People in China were using written numbers by about 1500 BC, in the Shang Dynasty. This is about two thousand years later than people began to write numbers in West Asia. It's more than a thousand years later than people began to write numbers in India. The Shang Dynasty [...]