This will help children learn about early calculating devices and who created the first calculating devices and how they work.They will learn and search and gain more about these devices.They will try to make calculating devices .
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Calculating Devices
1. EshikaChauhan
Grade-5 Mont Blanc
Calculating Devices
3000-BCAbacus
Abacus was the first calculatingdevice for calculations
and it was first made in China.The upperpart of abacus is
called heaven and the downward part is called
Earth.Heaven had 2 beads in each rod and the Earth had
5 beads in each rod.We use to do addition ,subtraction
,multiplication,and division .
2. EshikaChauhan
Grade-5 Mont Blanc
Pascaline
Blaise Pascal , french mathematician invented the first
mechanical calculator at the age of 19 in the year 1642.It is
used gears,wheel,and dials.Numbers were displayed by
rotating the wheels.It is capable to do addition and
subtraction.The gear principal was further employed in many
mechanical calculators.
3. EshikaChauhan
Grade-5 Mont Blanc
SteppedReckoner
Leibniz, a German mathematician invented the
mechanical calculatorcalled stepped reckonerin the year
1671.Apart from addition ,subtraction,multiplication
,divide , it can find square roots too!
4. EshikaChauhan
Grade-5 Mont Blanc
Arithmometer
Arithmometer is the first digital calculating device . It
was invented by ‘Charles Xavier Thomas’ , it was made
in the year 1820 . It was used in daily office life . It
became the first commercially successful mechanical
calculator.
5. EshikaChauhan
Grade-5 Mont Blanc
Comptometer
Dorr Eugene Felt , an American inventor and
industrialist , he made a calculating device called a
comptometer in the year 1887, and he also invented
the first printing adding machine called comptograph .