Question

which was the first calculating device ? when and by whom was it developed
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Answer 1

Answer:

The first mechanical calculating machine was invented in 1642 by Blaise Pascal, a 19-year-old Frenchman. Pascal's machine used gears and could add and subtract. Pascal's gear system was widely used in mechanical calculators built during the next few hundred years.

Answer 2

The first mechanical calculating machine was invented in 1642 by Blaise Pascal, a 19-year-old Frenchman. Pascal's machine used gears and could add and subtract. Pascal's gear system was widely used in mechanical calculators built during the next few hundred years.