Around 3000 BC Egyptians introduced a number system with base 10. They used unique symbols for 1 to 9, 10 to 90, 100 to 900 and 1000 to 9000. They write from right to left. The next era was of Sumerian/Babylonian number system its base was 60, the largest base also known as sexagesimal system.
They write from left to right. They use blank space for zero. Around 2500 BC Chinese introduced simplest and the most efficient number system. Its base was 10.
