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The Aztec Empire occupied the central part of today's Mexico. The capital city was Tenochtitlan, built on an island in the middle of Lake Texcoco. Mexico City now resides on top of this ancient city. The empire lasted from the late 14th century to the early 16th century. The Aztec number system was a base 20 (vegisimal) system. The notation used was dots and glyphs. A series of dots (kernel of corn) represented the first nine numbers. Ten was represented by a diamond. Twenty was represented by a flag, different feathers stood for hundreds, and a bag of cacao beans represented 8000. The Aztec number system had
no symbol for zero, and was an
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