2006 Ann B - Stanford University

Advancing beyond one-to-one correspondence, abstract counting utilizes pictographs representing an item [sheaf] preceded by a numeral [5]. The decimal or base-10 number system arises in Egypt, Sumer, and China. The Babylonian system uses a sexagesimal (base-60) positional notation. The Mayans use a modified vigesimal (base-20) system. ................
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