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 Description  
 Decimal System:  The base 10 number system that uses the digits 0, 1, 2, , 9. The decimal system is based around units of 10.

For example:

The number 256 really means (2 x 100) + (5 x 10) + (6 x 1) = (2 x 102) + (5 x 101) + (6 x 100).

The number 7.93 really means (7 x 1) + (9 x 0.1) + (3 x 0.01) = (7 x 100) + (9 x 1/101) + (3 x 1/102).

Decimal System

Since the Latin prefix "decem" means "tenth," decimal means a number based on tenths. The use of place value to represent integers in the decimal system can also be used to represent rational numbers. We extend the system for writing integers by using a decimal point. The decimal point indicates that the numbers to its right are less than 1. Place value also plays a role with the numbers to the right of the decimal. As numbers proceed to the right, they become smaller by a power of 10.