1, understand the meaning and nature of decimals, experience the application of decimals in daily life, further develop the sense of numbers, master the law of decimal size change caused by decimal position movement, and master the addition and subtraction operation of decimals.

2. Master elementary arithmetic's operation order and perform simple integer elementary arithmetic; Explore and understand the operation rules of addition and multiplication, and use them to perform some simple operations to further improve the calculation ability.

3. Knowing the characteristics of triangles, we will classify triangles according to the characteristics of sides and angles, and know that the sum of any two sides of a triangle is greater than the third side, and the sum of the internal angles of the triangle is 180 degrees.

4. Initially master the method of determining the position of objects, and can determine the position of objects according to the direction and distance, and can draw a simple road map.

5. Understand the statistical chart of broken lines, understand its characteristics, initially learn to analyze the changing trend of data according to statistical charts and data, and further understand the role of statistics in real life.

6. Experience the process of finding, putting forward and solving problems in real life, understand the role of mathematics in daily life, and initially form the ability to solve problems by using mathematical knowledge comprehensively.

7. Understand the thinking method of planting trees, form the consciousness of discovering mathematical problems from life, and initially form the ability of observation, analysis and reasoning.