2. Score: divide an object or several objects into several parts, which means 1 or several parts.

3. Addition and subtraction of fractions with the same denominator. (The denominator remains the same, and the numerator is added and subtracted. )

4. Total number ÷ denominator × numerator = number taken out. For example, what are three fifths of 90 peaches?

5, the numerator is the same, and the score with small denominator is large. The denominator is the same, and the fraction with large numerator is large.

6. Class 3 (1) has 20 boys and 25 girls. The number of boys accounts for the number of girls and the number of boys accounts for the number of students in the class.