The sexagesimal number system is based on sixty and uses place-value notation. Thus any numeral x can represent itself, or itself multiplied by sixty (x.60), or by sixty squared (x.60²), and so on, depending on the place position of the digits. Similarly, the same numeral can represent itself divided by sixty (x/60), or divided by sixty squared (x/60²), and so on. Context alone determines the correct reading. For example,

1,25,30 = 1.60²+25.60+30 = 3600 + 1500 + 30 = 5130
1,25;30 = 1.60 + 25 + 30/60 = 85½
1;25,30 = 1 + 25/60 + 30/3600 = 1 153/360

Source: Asger Aaboe, Episodes From The Early History of Mathematics (Washington, D.C.: Mathematical Association of America, 1964), pp. 8—9.