"Law of Addition" Law of Operation PPT Courseware 2

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"Law of Addition" Law of Operation PPT Courseware 2

1. Review import

Let’s talk about what operation laws are used in the following calculations.

76＋18＝18＋76

56＋72＋28＝56＋（72＋28）

31＋67＋19＝31＋19+67

2. Create situations and use them flexibly

(1) Collect information and clarify conditional issues

Question: What did you know? What to ask for?

(After knowing the distance Uncle Li plans to ride every day in the next four days, the requirement is how many kilometers Uncle Li will ride in the next four days.)

(2) Think independently and try to solve problems

Question: According to the meaning of the question, can you formulate the solution? (Students think independently and answer questions.)

(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 two different solutions, which one do you like? Tell me your reasons.

4. Why is the latter method simpler to calculate?

3. Independent exploration and discovery of new knowledge

(1) Try to solve the problem

This book has a total of 234 pages. How many pages are left to read?

Question: What did you know? What to ask for?

(Given the number of pages read yesterday and today and the number of pages in the entire book, how many pages are left to read?)

(2) Comparative observation and discovery of patterns

Questions: 1. Are these two students correct?

2. Can you write some other expressions with such characteristics?

3. What is the difference between 234-66-34 and 234-(66+34)?

4. Consolidate practice and improve understanding

5. Assign homework

Homework: Exercise 6, Question 5 on page 23.

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For more information about the "Laws of Operations and Laws of Addition" PPT courseware, please click the "Laws of Operations ppt Addition Laws of Operations" ppt tag.

"Laws of Addition" Laws of Operation PPT courseware:

"Laws of Addition" Laws of Operation PPT courseware 1. Create a situation and introduce a new lesson Questions: 1. Can you calculate by formula? 40＋56＝96 or 56＋40＝96 2. Why use addition calculation? ... ... ... 2. Preliminarily perceive the commutative law of addition in the situation..

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Update Time: 2024-09-28

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

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