Question

Name the earliest known calculating device and which country is known to have used it first

Answer 1

it's so simple
the earliest name of calculating device is abacus. actually it is used in Europe China and Russia.
hope it helps you.
did you understand it...?

Answer 2

Answer:

The earliest recorded calculating device is the abacus. Used as a simple computing device for performing arithmetic, the abacus most likely appeared first in Babylonia (now Iraq) over 5000 years ago. Its more familiar form today is derived from the Chinese version pictured below.