The field of "number and algebra"

The core goal of this field is to cultivate students' sense of numbers in combination with life situations. In the specific teaching materials

This point should be firmly grasped in analysis and teaching design.

Unit 1 Multiplication and Division

The main manifestations of this unit are:

Abstract mathematical model from practical problems

(Formulating)

-Solve the model (explore the oral calculation method)-Solve practical problems. In this process, in many

Various forms (oral arithmetic exercises, fun games, exploring laws, solving problems, etc.). ), consolidate the foundation.

Oral calculation skills.

1.

Abstract mathematical problems from practical problems

,

mathematical modeling

This unit arranges four situations, and encourages students to find mathematical information from each situation and find out the answers.

Mathematical problems,

According to the quantitative relationship contained in practical problems and the significance of learned operations,

Establish an equation.

The textbook passes the first situation "How many small trees are there"

The purpose is to inspire students to ask questions according to the situation.

Solve problems, and explore integer ten, integer hundred and integer thousand times one digit in the process of solving problems.

Mouth algorithm; Through the situation of "how much money is needed", guide students to explore how to multiply two digits by one digit.

Mouth algorithm (product within 100); Guide students to explore through the situation of "visiting science and technology museum"

Find a number divided by whole ten, whole hundred and whole thousand; Leading through the situation of "planting trees"

Guide students to explore the oral calculation method of dividing one digit by two digits. The process of abstracting formulas in practical problems

Students will further understand the significance of multiplication and division, cultivate their ability to ask questions and feel the relationship between mathematics and division.

Close contact with real life.

2.

Apply what you have learned to solve practical problems.

The oral calculation of one-digit multiplication and two-digit division is widely used in life, and there are teaching materials created.

In order to buy film, rent a car, buy stationery and many other life scenes, I also designed "what else can you propose?"

Mathematical problems "teaching activities. Teachers should use these situations to guide students to ask questions.

In the process of solving problems, we use the knowledge of multiplication and division to solve some simple practical problems around us.

Experience the practical application of mathematics in life and further deepen the understanding of the significance of multiplication and division.

The first is to solve the problems in the situation, which is also easy for teachers to ignore. Often affectionate.

Context leads to the formula, and after exploring the formula, the teacher ignores the situation. In fact, the role of situation is absolute.

This is not only to draw out the knowledge learned, but also to make students understand how to abstract formulas from situations in teaching.

-Calculation result-Explain the actual meaning of the result and check whether the result conforms to the actual process.

Cheng.

In order to understand the meaning of calculation and effectively use calculation to solve problems, you must have

Basic writing skills. At the same time, to strengthen the estimation, it is also necessary to have certain calculation skills as a guarantee. because

Therefore, this set of teaching materials focuses on enabling students to master basic written calculation skills.