Aztec+Inca+Maya

=__ Mathematics __=

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The Mayans are one of the most brilliant cultures in ancient America. They developed a number system that's still used today. It's similar to the number system that we American's use today, but instead of a ten-based system, theirs was twenty-based. For example they had place values for 20's, 400's, 8,000's, etc. They also had a system for writing them; a dot was one, a bar was five, and a shell was zero. To add or subtract, the Mayan's aligned two numbers and then combined or took away dots, bars, or shells. =====