History of Abacus

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History of Abacus. By: Huy Do &amp; 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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Presentation Transcript
History of Abacus

By: Huy Do & Trinh Huynh

Outline
• History of abacus
• Abacus lingo
• Why use abacus
• How to subtract
• How to multiply
• How to divide
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?
• 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?
• The first column is for units
• The second column is for tens
• The third column is for hundreds
• And so on…