The Babylonian numeration system is based on powers of 60 (sexagesimal system). There are two symbols:
Small numbers are represented much like the Egyptian system. For example:
To represent larger numbers, use several groups of symbols, separated by spaces, and multiply the value of these groups by increasing powers of 60.
Q1. Convert to Hindu-Arabic notation.
Because there is no symbol for zero, it is not always clear how many spaces are between symbol groups. For example:
The Babylonians used the symbol 
for subtraction.
For example, the numeral 
represents 20 – 3 = 17
To convert Hindu-Arabic numerals to Babylonian numerals, divide by powers of 60, similar to the way seconds are converted to hours and minutes.
Q2. Write 12,221 as a Babylonian numeral.
Q3. Write the Babylonian numeral as a Hindu-Arabic numeral.
Q4. Write 745 as a Babylonian numeral.
Solutions: