1, division is an operation with operation sign; The score is a number. Therefore, it should generally be said that dividends are equivalent to a molecule, but it cannot be said that dividends are a molecule.

2. Because there is a close relationship between fraction and division, the basic properties of fraction can be obtained according to the properties of "constant quotient" in division.

3. The numerator and denominator of the score are multiplied or divided by the same number (except 0), and the size of the score remains unchanged. This is called the basic nature of fraction, which is the basis of divisor and total fraction.

4. Meaning of score: Divide the unit "1" into several parts on average, and the number representing such one or several parts is called score. In the fraction, the number indicating how many parts the unit "1" is divided into on average is called the denominator of the fraction; A number indicates how many copies have been made, which is called the numerator of the fraction; One of them is called fractional unit.

5. The meaning of percentage: The number indicating that one number is the percentage of another number is called percentage. Also called percentage or percentage. Percentages are usually not written in the form of fractions, but expressed in concrete "%". Generally, the percentage only indicates the multiple relationship between two quantitative relationships, and cannot be related to the company name.