# FUNDAMENTALS OF COMPUTER

## BASIC COMPUTER CONCEPTS

### HISTORY OF COMPUTERS

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In early times what did people used to do calculations when the computers were not invented?
 A Abacus B Eratosthenes C Pencil D Pen
Explanation:

Detailed explanation-1: -The abacus remained the only computing device for over 4, 000 years even if some tables of numbers were developed by the Greek and Roman cultures as well as the Mesopotamian and the Egyptians.

Detailed explanation-2: -He invented a system of longitude and latitude and made a map of the known world. He also designed a system for finding prime numbers-whole numbers that can only be divided by themselves or by the number 1. This method, still in use today, is called the “Sieve of Eratosthenes.”

Detailed explanation-3: -In the third century BCE, Eratosthenes, a Greek librarian in Alexandria, Egypt, determined the earth’s circumference to be 40, 250 to 45, 900 kilometers (25, 000 to 28, 500 miles) by comparing the Sun’s relative position at two different locations on the earth’s surface.

There is 1 question to complete.