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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.


Modern chinese abacus lingo
“Modern” Chinese abacus lingo

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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…




How to multiply 6 x 4 feed 6 beads into abacus 4 times
How to Multiply6 x 4 Feed 6 beads into abacus 4 times


How to divide 24 8 how many 8 s are there in 24
How to divide 24 / 8How many 8’s are there in 24


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