"Same Level Operations" Mixed Operations PPT Courseware

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"Same Level Operations" Mixed Operations PPT Courseware

1. Review old knowledge

Tell the order of operations for each question and then calculate.

16＋9＋8＝ 32-10-6＝ 25＋20-10＝

2. Explore new knowledge

(1) Observe carefully, collect information, and solve problems

There were 53 people in the reading room in the morning, 24 people left at noon, and 38 people came in the afternoon. How many people were in the reading room in the afternoon?

(2) Feedback and communication, summarizing the order of addition and subtraction operations

Question: A calculation like 53-24+38 is a comprehensive calculation. Can you tell me what order of operations you use to calculate it?

Summary: In calculations without parentheses, when there are only addition and subtraction operations, they must be calculated from left to right.

(3) Learning off-the-shelf calculation formats

Questions: 1. What is the first question in this question? What else?

Note: (Draw a horizontal line under "53-24") In order to clearly see the order of operations, you can perform calculations in a decoupled manner, showing the order of operations and the results of each calculation. Write the result of the first step of calculation (29) below the equation, copy the numbers that have not yet been calculated (+38), and write the result of the second step of calculation (=67) below the equation. Note: Align the equal signs up and down.

Question: 2. What should we pay attention to when writing?

3. Consolidate practice

(1) Calculation

Question: Think about it, tell me, what should I count first? What else?

Summary: In calculations without parentheses, only additions and subtractions or only multiplications and divisions must be calculated in order from left to right.

(2) Is the following calculation correct? If it's not right, correct it

Questions: 1. Who understands the meaning of the question? 2. What’s wrong with question 2? 3. What’s wrong with question 3? 4. In what order are these comprehensive formulas calculated?

4. Classwork

Homework: Exercise 11 on page 50, Questions 1 and 2.

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For more information about the "Mixed Operations Same Level Operations" PPT courseware, please click the Mixed Operations PPT Same Level Operations PPT tab.

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Update Time: 2024-11-13

This template belongs to Mathematics courseware People's Education Press Second Grade Mathematics Volume 2 industry PPT template

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