The Chinese used red and black calculating rods as early as 300 B.C. How many years ago was that?

what is your thinking?

ok my guess is that you subtract 300 from 2009 and you get 1709?

To determine how many years ago the Chinese used red and black calculating rods in 300 B.C., we can subtract 300 from the current year. Let me find out the current year and calculate the answer for you.

- Current year: 2022
- Calculation: 2022 - 300 = 1722

Therefore, the Chinese used red and black calculating rods approximately 1,722 years ago.