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History of Abacus PowerPoint Presentation

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Slide 1 - History of Abacus By: Huy Do & Trinh Huynh
Slide 2 - Outline History of abacus Abacus lingo Why use abacus How to add How to subtract How to multiply How to divide
Slide 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.
Slide 4 - “Modern” Chinese abacus lingo 1 2 3 4 5 6 7 8 9 10 11 12 13
Slide 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.
Slide 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…
Slide 7 - How to Add 8 + 5
Slide 8 - How to Subtract 13 - 9
Slide 9 - How to Multiply 6 x 4 Feed 6 beads into abacus 4 times
Slide 10 - How to divide 24 / 8 How many 8’s are there in 24
 

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