Mathematics Understanding Negative Numbers is a textbook

The advantages and disadvantages of negative cognition evaluation are as follows:

The observation dimension I chose was "Consistency of Targeted Teaching Evaluation". Combined with class observation, let's talk about a few simple experiences and feelings.

There are four major teaching links in this lesson: 1. Create a realistic situation and have a preliminary understanding. 2. Intuitive operation and deepening understanding. 3. Timely extension and enrichment of imagination. Fourth, abstract number axis, improve understanding. Fifth, layered exercises, consolidation and extension.

Advantages: 1. From the perspective of goal achievement, knowledge is implemented. The three-dimensional goals set in this lesson can be effectively achieved, and under the teacher's concise language guidance and ingenious teaching design, the students have a solid grasp of the knowledge.

2. From the perspective of students' learning interests, the classroom is flexible. In this class, the students' enthusiasm for learning is very high, the teachers and students cooperate tacitly, and the students' responses in the classroom are as smart as spring water, coupled with the teacher's kind teaching style and language, giving people a very comfortable feeling.

Disadvantages: 1. The examples of positive and negative numbers given by students are still biased towards integers. Most of the data presented to students by the teacher may be biased towards integers, and the students' mindset may also like to give examples of integers, so it is best to guide students to give more examples from various aspects to make the knowledge more perfect.

Silver rolling. >2. How to reflect students' autonomy in knowledge seems to be insufficient. For example, in the temperature, just let individual students come up and dial it, if you can let each student mark a mark on the paper thermometer, discuss how you mark it in the group, and then give feedback, it may be more reflective of the student's autonomy.

3. However, there is no timely analysis and dialectic of individual students' different opinions, which leads students to think that the teacher does not pay attention to their own ideas. In the future, we should pay attention to being student-oriented, return the classroom to the students who occupy the main position, and appear in the classroom teaching as a guide.

4. The effectiveness of classroom questions is lacking, and there are too scattered questions, which affect the effect of classroom teaching, and should be strengthened in the future.

With volts1. Teaching Objectives:

1. Guide students to have a preliminary understanding of negative numbers in familiar life situations, and be able to read and write positive and negative numbers correctly; Know that 0 is neither positive nor negative.

2. To enable students to initially learn to use negative numbers to represent some practical problems in daily life, and experience the connection between mathematics and life.

3. Combine the history of negative numbers to educate students on patriotism; Cultivate students' good mathematical emotions and attitudes.

2. Pre-class Preview Guidance:

1. Give an example of what is a negative number? How to read? How to write?

2. Give an example of what is a positive number? How to read? How to write?

3. In daily life, do you use negative numbers in **?

3. Classroom learning and discussion:

a. Conversation

Let's start with this topic in today's math lesson. (Board book: the opposite.)

There are many natural and social phenomena around us that exist in the opposite situation, please look at the screen: (Courseware****. The sun rises in the east and sets in the west every day; Bus stops have people boarding and dropping off; There are both buying and selling in the bustling street market; In the fierce arena, there are both losses and wins, ......Can you name some of these phenomena?

b. Teaching knowledge

1 denotes an amount of the opposite sense.

1) Introduce an instance.

Talk: If you continue to "chat" along the topic just now, it will be natural to go into mathematics, let's take a look at a few examples (courseware presentation).

In the sixth grade, 6 students transferred in the last semester and 6 students transferred away this semester.

Aunt Zhang did business, making a profit of 1,500 yuan in February and a loss of 200 yuan in March.

Compared with the standard weight, Xiao Ming is heavier than a kilogram, and Xiao Hua is lighter than a kilogram.

A reservoir where the water level rises by meters in summer and drops by meters in winter.

It is pointed out that these opposite words and specific quantities combine to form a set of "opposite quantities". (Supplementary board book: Quantities in the opposite sense.) ）

2) Try. How can we mathematically represent these opposite quantities?

Invite students to choose an example and try to write a representation.

3) Presentation and communication.

2 Recognize positive and negative numbers.

1) Introduce positive and negative numbers.

Talk: Just now, a student wrote in front of 6 " " means 6 people are transferred, add " " means 6 people are transferred away (board book: 6 6), this representation is completely consistent with mathematics.

Introduction: Numbers like "6" are called negative numbers (board book: negative numbers); This number reads as: minus six. , here has a new meaning and role, called "minus". "It's a positive sign.

Like "6" is a high state positive number, which reads: positive six. We can precede 6 with " " or omit it not to write (board book: 6). In fact, many of the numbers we knew in the past were positive.

2) Give it a try.

Use positive and negative numbers to represent other sets of quantities with opposite meanings.

After writing, communicate, check.

3. Connect with reality and deepen understanding.

1) What do the numbers on the passbook mean? (Example 2.) ）

2) Refer to the actual life of a set of quantities with opposite meanings, and use positive and negative numbers to express them.

Primary Mathematics 6 Negative Numbers Courseware.