The basic nature of 1. Score is an important content of Unit 5 of Book 10 of Nine-year Compulsory Education and Six-year Primary School Mathematics. The teaching content is based on the meaning of fraction, the relationship between fraction and division, and the constant quotient law in integer division. In the original textbook, students first intuitively understand that the numerator and denominator of 1/2, 2/4 and 3/6 4/8 are different, but the scores are the same. The numerator and denominator of a fraction are multiplied or divided by the same number at the same time (except zero), and the size of the fraction remains unchanged.

2. Basic properties of decimals: Add or remove 0 at the end of decimals, and the size of decimals remains unchanged.

3. The basic nature of the ratio: the former term of the ratio and the latter term of the ratio expand (or contract) by the same multiple at the same time, and the ratio remains unchanged.

4. Meaning of percentage: The number indicating that one number is the percentage of another number is called percentage, and the percentage is also called percentage or percentage.

5. Meaning of decimals: Numbers used to represent one tenth, one hundredth and one thousandth are called decimals, which are part of the meaning of fractions.

Meaning of 6 ratio: The formula for dividing two numbers is ratio.

Its relationship with the score is: the former term of the ratio is equivalent to the numerator of the score, the latter term is equivalent to the denominator of the score, and the comparison symbol is equivalent to the fractional line;

The relationship between ratio and division is that the former term of ratio is equivalent to the dividend in division, the latter term is equivalent to the divisor in division, and the sign of ratio is equivalent to the divisor.