History of AbacusOutlineSlide 3“Modern” Chinese abacus lingoWhy use Abacus?How does it work?How to Add 8 + 5How to Subtract 13 - 9How to Multiply 6 x 4 Feed 6 beads into abacus 4 timesHow to divide 24 / 8 How many 8’s are there in 24History of AbacusHistory of Abacus By: Huy Do & Trinh HuynhBy: Huy Do & Trinh HuynhOutlineOutlineHistory of abacusHistory of abacusAbacus lingo Abacus lingo Why use abacusWhy use abacusHow to addHow to addHow to subtractHow to subtractHow to multiplyHow to multiplyHow to divideHow to divideHistory of AbacusHistory of AbacusAbacus ? (personal calculator)Abacus ? (personal calculator) - a device used for “+”, “-”, “x”, “/”- a device used for “+”, “-”, “x”, “/”- does not require the use of pen & paper and good for any - does not require the use of pen & paper and good for any base number systembase number system - derives from the Greek word ABAX – table or board covered - derives from the Greek word ABAX – table or board covered with dustwith dustMost historians believe the abacus was first created in Central Most historians believe the abacus was first created in Central AsiaAsiaFrom there it spreads West to Europe, and East to China, and From there it spreads West to Europe, and East to China, and its neighboring Oriental countries its neighboring Oriental countries ““Modern” Chinese abacusModern” Chinese abacus- appeared in China between the 12- appeared in China between the 12thth and 13 and 13thth century AD. century AD.““Modern” Chinese abacus lingoModern” Chinese abacus lingo12345678910111213Why use Abacus?Why use Abacus?Run by handRun by handSimple to useSimple to useOperate for yearsOperate for yearsTeach you how to manipulate numbers Teach you how to manipulate numbers - how each digit relates to the others and use that knowledge to - how each digit relates to the others and use that knowledge to do all the major operations - +,*,/do all the major operations - +,*,/Let you learn all about the base ten systemLet you learn all about the base ten systemShow you how to math in the decimal system and the binary Show you how to math in the decimal system and the binary system system Can solve problems just as fast or even faster than a modern Can solve problems just as fast or even faster than a modern electric computer.electric computer.How does it work?How does it work?The first column is for unitsThe first column is for unitsThe second column is for tensThe second column is for tensThe third column is for hundredsThe third column is for hundredsAnd so on…And so on…How to AddHow to Add8 + 58 + 5How to SubtractHow to Subtract13 - 913 - 9How to MultiplyHow to Multiply6 x 4 6 x 4 Feed 6 beads into abacus 4 Feed 6 beads into abacus 4 timestimesHow to divide How to divide 24 / 824 / 8How many 8’s are there in 24How many 8’s are there in
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