Senior one to senior three is the basic period of primary school, and the fourth grade is the turning point of primary school, which is the key period for preparing for junior high school, especially in calculation. The fourth grade mathematics is the summary of the basic calculation and comprehensive application ability of mathematics in the first, second and third grades of primary school. This year, we will learn the basic calculation of integers in primary schools, such as the vertical form of addition, subtraction, multiplication and division. This year, we learned difficult elementary arithmetic and mastered the usage of brackets and brackets. I also learned simple operations, including the commutative law of addition, the associative law of addition, the commutative law of multiplication, the associative law and the distributive law. In the actual problem solving, I also used some simple calculation methods, such as the nature of subtraction, the nature of division, and the disassembly complement method.

The basic ability of calculation is not the focus of mathematics after the fourth grade, but is applied to the calculation of decimals and fractions through integer calculation methods learned in the fourth grade and before. Therefore, the fourth grade is the end of integer calculation and the beginning of other calculations, which plays a connecting role. If the calculation ability in front is not good, it will be difficult to get high marks in the mathematics behind.