What mathematical systems of calculation did the Indians and Mayans develop? Which one is used today?

What mathematical systems of calculation did the Indians and Mayans develop? Which one is used today? What discoveries in mathematics have these peoples made?

The Indians developed a decimal number system – Indian numerals, which are now used all over the world (called “Arabic”). Mathematicians knew how to manipulate fractions. The Maya used the twenty as the basis of the score. They introduced the concept of zero for the first time in the world.

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