**Numerals** are symbols used to represent numbers.

**Numeral systems** are systems for representing numbers using these symbols.

There are several different numeral systems in use around the world, including the **Hindu-Arabic numeral system**, which is used in most parts of the world, and the **Roman numeral system**, which is still used in some contexts, such as for numbering chapters in books and naming Super Bowl games.

The Hindu-Arabic numeral system is a base-10 system, which means that it uses 10 different digits (0, 1, 2, 3, 4, 5, 6, 7, 8, and 9) to represent all numbers. In this system, the value of a digit is determined by its place in the number. For example, in the number 35, the 3 represents 3 tens, and the 5 represents 5 ones.

The Roman numeral system is a base-10 system that uses a set of seven symbols to represent numbers: I, V, X, L, C, D, and M. These symbols can be combined to represent larger numbers. For example, the number 39 can be represented as XXXIX in Roman numerals.

Other numeral systems include the **binary system**, which is used in computers and is based on the digits 0 and 1, and the **octal system**, which is based on the digits 0 through 7.

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