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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 .
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.
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!
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.
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 .
EshikaChauhan
Grade-5 Mont Blanc

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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 .