How many practical problems are there in solving math problems in senior one?

How many practical problems are there in seeking * * *

Teaching objectives

1. Learn to solve practical problems with mathematical knowledge.

2. Train students to solve the same problem in different ways, and cultivate their thinking flexibility and innovation ability.

Make love.

3. Feel the application of mathematics in daily life and stimulate students' interest in learning mathematics. Solve the teaching key points

Difficult measures

Key points: Apply the knowledge of mathematics to solve problems.

Teaching process:

First, create a situation and realize that different things can be observed from different angles.

1. Review the oral addition calculation of numbers within 20, and ask students to talk about methods to pave the way for this lesson.

2. Show pun: From the same pair, you can observe different things from different angles.

Let students look at two interesting pictures before class. Do you want to see them?

What do you see in the first picture?

Health: Two face vases.

What about the second picture?

Health: beauty flower

Teacher: Very interesting. Why do we see different things in the same picture?

Health: Different angles.

Yes, the same painting can see different things from different angles, which requires us to have a pair of observation eyes. This class made me walk into our math class with these observation eyes.

2. Watch the big screen: Cheerleading performance

The question is "A * * *, how many people are there?" Please observe carefully. What mathematical information can you collect from the pictures to solve this problem?

Default 1: divided into two lines.

Presupposition 2: There are boys and girls.

Preset 3: 7 people in the front row and 8 people in the back row.

Premise 4: There are 9 boys and 6 girls.

Premise 5: There are more boys than girls.

……

Teacher: Why is the information observed in the same picture different?

4. Students communicate and raise their hands to answer: different observation angles.

Second, feel from different angles.

1. Swing.

The mathematical information collected from different angles is different. Use learning tools to present the information you observe.

Yes, please sit up straight.

gather information

Talk at the same table and connect the known information with the question.

Health 1: 8 people in the front row and 7 people in the back row. A * *, how many people are there?

Student 2: There are 9 boys and 6 girls. How many?

(Problem solving: Write a list of formulas on the draft paper according to what you put out)

Health 1: From the front row and the back row, there are 8 people in the front row and 7 people in the back row. How many people are there altogether? By addition, the formula is: 8+7= 15 (blackboard writing)

Student 2: For boys and girls, there are 9 boys and 6 girls. How many people are there altogether? It is calculated by addition, so my formula is: 9+6= 15 (blackboard writing)

3. compare it.

Teacher: This problem can be calculated in this way or in this way. Are there any similarities between these two formulas?

Student: All the numbers are 15 by addition.

Teacher: Why do they all use addition?

Summary: We observe this picture from different angles, extract different mathematical information and find different solutions, but we all seek a * * * How many people are there? To find the total, we all combine the two parts, so we all use addition, and the answer is the same.

4. Check:

Teacher: What should we do after solving the formula?

Health: Remember to check.

Teacher: Check our answers, right? How will you test it?

1: Count.

Health 2: Check it in another way.

Health 3: Recalculate the position of the exchange addend.

Health 4: Add ten methods at most.

Summary: Summarize various addition methods.

Third, practice consolidation.

How many swans are there?

Ask the students to find out the mathematical information in the picture, answer the formulas side by side and say the meaning of each formula.