Finally completed in 1694 the Leibnitz calculator can add,subtract,multiply, and divide numbers. The stepped drum principle of Gottfried Leibnitz's invention survived for 300 years.
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No, it wasn't. The first calculator was called the pascaline.
Start > All Programs > Accesories > Calculator. You can also do: Start > Run > Type (without "'s) "calculator". Google also has a built in calculator. You can ask Google any question, eg "What is 2+2?", it will return the answer "4".
The first mass-produced mechanical calculator was made by Charles Xavier Thomas, around 1920. The first mass-produced electronic calculator was probably the Sharp QT-8D, mass-produced in 1969.
Yes, abacuses (or is it abaci?) were used to calculate simple maths problems.
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