1. Understanding of numbers: concepts such as natural numbers, integers, fractions, decimals, positive numbers, negative numbers and zeros.

2. Addition, subtraction, multiplication and division: the basic concepts and operation methods of addition, subtraction, multiplication and division of addition principle.

3. Quantitative relationship: size relationship, quantity relationship, comparative size, equality relationship, etc.

4. Score: the basic concept of score, the simplification of score, the addition, subtraction, multiplication and division of score, the comparative size of score, etc.

5. Decimal: the basic concept of decimal, the reading method of decimal, the addition, subtraction, multiplication and division of decimal, the comparative size of decimal, etc.

6. Triangle: the basic concept, classification, nature and area of triangle.

7. Straight line and angle: the basic concept of straight line, the basic concept of angle, the classification of angle, the degree of angle, the measurement of angle and so on.

8. Data statistics: data collection, collation, statistics and analysis, such as frequency, frequency, average, median and pattern.

9. Geometry: the basic concept, classification, properties and area of plane graphics.

10. Time and calendar: understanding of time, calculation of time, use of calendar, etc.

1 1, addition and subtraction of fractions: add and subtract fractions with denominator, only add and subtract numerators, and the denominator remains unchanged. Fractions of different denominators are added and subtracted, first divided, then added and subtracted.

12, comparison of fractional size: Compared with the fraction of denominator, the numerator is large and the numerator is small.