Question

The first mechanical calculating device was​

Answer 1

Answer:

abacus

abacusThe earliest known calculating device is probably the abacus.

Answer 2

Explanation:

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.