What were the three achievements of the maya

The 3 achievements of Maya was The Mayans were skilled road builders. They were able to create one of the most advanced road systems of their time. Mayans were also one of the first civilizations to develop a writing system called codex. They used their codex to record information in books made from the bark of fig trees. They developed a mathematical system based on the number 20. They were among the first people to use the number zero. They were able to build a solar, and religious calendar. They created terrace farming and Quechua. Hope this helps