1. What is the teaching goal of this textbook?

The teaching objectives of this book are:

1. Understand the meaning and nature of decimals, understand 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 the operation order of elementary arithmetic and carry out 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 inner angles of the triangle is 180.

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. Know the broken-line statistical chart, understand its characteristics, initially learn to analyze the changing trend of data according to the statistical chart and data, and further understand the role of statistics in real life.

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

7. Understand the thinking method to solve the problem of planting trees, cultivate the consciousness of discovering mathematical problems from life, initially cultivate the ability to explore effective methods to solve problems, and initially form the ability of observation, analysis and reasoning.

8. Experience the fun of learning mathematics, improve the interest in learning mathematics, and build confidence in learning mathematics well.

9. Develop the good habit of working hard and writing neatly.

Second, what is the teaching focus of this textbook? Why?

The teaching focus of this textbook is: the meaning and nature of decimals, addition and subtraction of decimals, arithmetic and simple calculation. Triangle is the key teaching content of this textbook. Because:

In terms of number and calculation, this textbook arranges the meaning and nature of decimals, addition and subtraction of decimals, four operations, algorithms and simple operations. Decimals are widely used in daily life, and the knowledge about the concept of decimals and the four arithmetic abilities of decimals is the basic knowledge and ability that primary school students should master and form. Students already know the simple decimal in the first class and can calculate the addition and subtraction of a decimal. In this semester, students will systematically learn the meaning and nature of decimals, the comparison of decimal sizes, the changes of decimal sizes caused by the movement of decimal positions, and learn more complicated addition and subtraction of decimals. Make students understand the meaning of decimals well, express and exchange information with decimals, and initially learn to solve problems with decimal knowledge. The knowledge about the order and law of the four operations is also the basic knowledge of calculation that primary school students should master, and in the first phase, students have been exposed to mixed operations and other related contents, learned the mixed operation formula problems calculated from left to right in turn, and initially understood the role of brackets. This semester, students will systematically learn the operation order of mixed operations, focusing on the operation order of elementary arithmetic of secondary operations, laying the foundation for learning to list comprehensive formulas to solve problems; On the other hand, the arithmetic is mainly based on students' intuitive understanding, summarizing the arithmetic of addition and multiplication, and learning to use the arithmetic to perform simple operations.

In solving problems with mathematics, on the one hand, the textbook combines the calculation content and uses the knowledge of four integer operations and decimal addition and subtraction operations to solve simple problems in life; On the other hand, arrange the teaching content of "Mathematics Wide Angle" to guide students to experience the mathematical thinking method of planting trees and feel the charm of mathematics through observation, speculation, experiment and reasoning. At the same time, let students learn to solve some simple practical problems by planting trees, cultivate students' ability of observation, analysis and reasoning, and cultivate their interest in exploring mathematical problems and their awareness of discovering and appreciating mathematical beauty.

In terms of space and graphics, this textbook arranges two units: position and direction and triangle, which is the difficulty or key teaching content of this textbook. On the basis of existing knowledge and experience, through rich mathematical activities, students can further understand the characteristics of triangles and the method of determining their positions. Enable students to further develop the concept of space, improve their observation ability and hands-on operation ability, and gain inquiry learning experience in the activities of exploring the characteristics and transformation of graphics and determining the position of objects according to direction and distance.

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