"Problem Solving" Laws of Operation PPT Courseware

Description

"Problem Solving" Laws of Operation PPT Courseware

1. Review import

Let’s talk about the laws of operation we have learned and represent them with letters.

Commutative law of addition: a+b=b+a

Additive associative law: (a+b)+c=a+(b+c)

Commutative law of multiplication: a×b=b×a

Multiplicative associative law: (a×b)×c=a×(b×c)

Distributive law of multiplication: a×(b+c)=a×b+a×c

When solving problems, flexible application of these operation laws can make calculations easier.

2. Create situations and use them flexibly

(1) Collect information and clarify conditional issues

(2) Think independently and try to solve problems

Question: What information is needed to solve this problem? Can you solve this problem based on the selected information?

(I bought 25 tubes of badminton in a “dozen” pack, and a “dozen” is 12 pieces.)

(3) Understand the process and understand different methods

Questions: 1. Do you have any other calculation methods?

2. Who can tell me your understanding of this solution?

3. Compare 3 different solutions, which one do you like? Tell me your reasons.

(4) Review, reflect, and communicate different methods

Question: 1. How to check whether the result is correct?

2. What are the similarities and differences among these different algorithms?

3. What should we pay attention to when solving practical problems?

3. Independent exploration and discovery of new knowledge

(1) Try to solve problems independently

Question: What information is needed to solve this problem? Can you solve this problem based on the selected information?

(Students solve problems independently.)

(2) Comparative observation and discovery of patterns

Question: 1. After 330÷5, why is it still ÷2?

2. Are there different calculation methods?

4. Consolidate practice and improve understanding

Questions: (1) What do you know?

(2) Can you solve this problem? Write out your thought process.

(3) Who understood what he meant? Talk about it.

(4) Whose ideas are different from his? Can you tell me more?

(5) Did you do it correctly?

5. Assign homework

Homework: Exercise 8, question 3 on page 30; Exercise 8, question 7 on page 31.

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Update Time: 2024-09-26

This template belongs to Mathematics courseware People's Education Press fourth grade mathematics volume 2 industry PPT template

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