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History of Abacus. By: Huy Do & Trinh Huynh. Outline. History of abacus Abacus lingo Why use abacus How to add How to subtract How to multiply How to divide. History of Abacus. Abacus ? (personal calculator) - a device used for “+”, “-”, “x”, “/”

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history of abacus
History of Abacus

By: Huy Do & Trinh Huynh

outline
Outline
  • History of abacus
  • Abacus lingo
  • Why use abacus
  • How to add
  • How to subtract
  • How to multiply
  • How to divide
history of abacus1
History of Abacus
  • Abacus ? (personal calculator)

- a device used for “+”, “-”, “x”, “/”

- does not require the use of pen & paper and good for any base number system

- derives from the Greek word ABAX – table or board covered with dust

  • Most historians believe the abacus was first created in Central Asia
  • From there it spreads West to Europe, and East to China, and its neighboring Oriental countries
  • “Modern” Chinese abacus

- appeared in China between the 12th and 13th century AD.

why use abacus
Why use Abacus?
  • Run by hand
  • Simple to use
  • Operate for years
  • Teach you how to manipulate numbers

- how each digit relates to the others and use that knowledge to do all the major operations - +,*,/

  • Let you learn all about the base ten system
  • Show you how to math in the decimal system and the binary system
  • Can solve problems just as fast or even faster than a modern electric computer.
how does it work
How does it work?
  • The first column is for units
  • The second column is for tens
  • The third column is for hundreds
  • And so on…
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