1. Addition and subtraction of fractions: I began to learn addition and subtraction of fractions in the fourth grade, which is an important knowledge point in mathematics. Students need to master the basic concepts of fractions, the comparison of fractions, and the law of addition and subtraction of fractions. In addition and subtraction of fractions, students need to pay attention to the same denominator or coprime before they can add and subtract directly, otherwise they need division or division.
2. Understanding and operation of decimals: I began to learn the concept and operation of decimals in the fourth grade. Students need to master the reading and writing of decimals and the comparison of decimal sizes. In the operation of decimals, students should pay attention to the position alignment of decimals and the operation rules of addition, subtraction, multiplication and division of decimals.
3. Elementary arithmetic: I started to learn elementary arithmetic in the fourth grade, that is, addition, subtraction, multiplication and division are all included in one formula. Students need to know the order and priority of elementary arithmetic, and how to use parentheses correctly to change the operation order.
4. Calculation of length, area and volume: In the fourth grade, I began to learn the calculation of length, area and volume. Students need to master the conversion relationship between different units and how to calculate the length, area and volume of an object according to given conditions.
5. Solving practical problems: In the fourth grade, I began to learn the ability to solve practical problems. Students need to be able to apply their mathematical knowledge to real life and solve problems by analyzing problems, establishing mathematical models and using appropriate mathematical methods.