The decimal rate unit is 10. In the decimal number system, the ratio of any two adjacent numbers is equal, namely110. For example, the first digit to the right of the decimal point is called decimal, and the counting unit is 0.1; The second digit is called percentile, and the counting unit is 0.0 1. Therefore, 10 0.0 1 is 0. 1, 10 0. 1 is 1, indicating that the progressive rate between every two adjacent counting units is 10. Decimal system is a special form of real number. All scores can be expressed in decimals. The point in the decimal is called the decimal point, which is the dividing line between the integer part and the decimal part of a decimal. Decimals with zero integer parts are called pure decimals, and decimals with non-zero integer parts are called decimals. For example, three tenths can be written as decimal 0.3. Decimals are divided into integer parts, decimal points and decimal parts.