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"Tikal covered six square kilometers (more than two square miles)"

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the Mayan numbering system is significant because it made the concept of zero.

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"We write numbers using a system in which the value of each digit depends on its position within the number."

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"The Maya developed their calendar further than any other New world people, and their calendar was more accurate than any other of their time."

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"this type of system cold not work with out symbol cold not work with out a 0 to show when a position is empty".

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" first cultures in the

world to develop the idea

of the zero".

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"Tikal covered six square kilometers more than two square miles"

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this from Carl
There trading network took a lot of effort because in the text it says, "Posters carried goods for 10 hours per day at a speed of 1 to 3 miles per hour. Loads varied between 80 to 150 pounds. Porters carrying heavy loads worked in rotating relay teams."

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It took a lot of effort to take large bags of stuff ten miles away using your feet and back.

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'' it took so much effort that 80 to 130 mile workers how to build it the city and it took them about two months''

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"the maya where the only civilation  that had such advanced numbering system

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"this type of system cold not work with out symbol cold not work with out a 0 to show when a position is empty".