What were the first calculating machines?

Answer 1

Possibly the abacus, a board with wood rods, and wood beads on the rods. It is thousands of years old.

The first electronic computer, I think, was Univac. It used vacuum tubes instead of solid state devices to do its computing.

Answer 2

In 1642 Frenchman Blaise Pascal (1623-1662) invented the first adding machine, called the Arithmetic Machine. Gottfried Leibniz (1646-1716) expanded on Pascal's ideas and in 1671 developed the "step reckoner,"

Answer 3

The name of first calculating machine is known as ABACUS.

Answer 4

Essentially yes, the first computer was the ENIAC (Electronic Numerical Integrator and Computer), which had the capability to add roughly 5000 numbers in one second.