Positional notation with no zero is awkward. https://en.wikipedia.org/wiki/Sexagesimal#Babylonian_mathematics https://en.wikipedia.org/wiki/Sexagesimal#Babylon

Positional notation with no zero is awkward. https://en.wikipedia.org/wiki/Sexagesimal#Babylonian_mathematics https://en.wikipedia.org/wiki/Sexagesimal#Babylonian_mathema... "For example, the symbols for 1 and 60 are identical."