12. What mathematical system did the Babylonians develop?

The Babylonians developed a base-60 (sexagesimal) numerical system. This system was notable for its use of 60 as a base for counting and measuring, which is still reflected in our timekeeping (60 seconds in a minute, 60 minutes in an hour) and in measuring angles (360 degrees in a circle, which is 60 times 6). Their numeral system included a symbol for zero, which was a significant advancement in mathematics. The Babylonians used a combination of symbols to represent different values, and their system allowed for complex calculations in astronomy and other fields.