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History of Abacus

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Most historians believe the abacus was first created in Central Asia ... West to Europe, and East to China, and its neighboring Oriental countries ' ... – PowerPoint PPT presentation

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Title: History of Abacus


1
History of Abacus
By Huy Do Trinh Huynh
2
Outline
  • History of abacus
  • Abacus lingo
  • Why use abacus
  • How to add
  • How to subtract
  • How to multiply
  • How to divide

3
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.

4
Modern Chinese abacus lingo
1
2
3
4
5
6
7
8
9
10
11
12
13
5
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.

6
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

7
How to Add8 5
8
How to Subtract13 - 9
9
How to Multiply6 x 4 Feed 6 beads into abacus 4
times
10
How to divide 24 / 8How many 8s are there in
24
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