"Tongfen" PPT courseware on the meaning and nature of fractions

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"Tongfen" PPT courseware on the meaning and nature of fractions

1. Create situations and study example 4

Xiao Ming and his grandma planted 3/10 of the vegetable field with rapeseed and 7/10 with eggplant. Do they grow more rapeseed or eggplant?

1. Everyone says they grow a lot of eggplants. Can you tell me why?

① Rapeseed occupies 3/10 of this vegetable field, that is, the vegetable field is divided into 10 equal parts, accounting for 3 of them. Eggplant occupies 7/10 of this vegetable plot. The vegetable plot is divided into 10 equal parts and occupies 7 of them. Each portion is the same size, 7 portions is more than 3 portions.

3. What did you discover by comparing the sizes of this set of scores?

4. In summer, Xiao Ming and his grandma planted 3/8 of the vegetable field with cucumbers and 3/7 with tomatoes. Which one has more cucumbers or tomatoes?

2. Create situations and explore common methods

1. Xiao Ming and his grandma also planted broad beans and soybeans in the vegetable field, because they are rich in protein and fat and are very healthy when eaten regularly. Which protein content is higher, soybeans or broad beans?

2. Report and communicate.

① Solve problems by drawing pictures.

②The fraction ratio of the same molecules.

③Convert them into fractions with the same denominator and compare them.

3. All three methods compared the sizes of 2/5 and 1/4. Which of the three methods do you prefer? Tell me why.

3. Consolidate practice and use it skillfully

1. Fill in “＞”, “＜” or “=" in ( ).

Let’s talk about how fractions should be compared.

4. Summarize and improve, and resolve doubts

Today we studied common points, what did you gain? Do you have any unresolved questions?

5. Assign homework

Homework: Exercise 18 on page 75, questions 1, 2, 3, and 4.

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For more information about the PPT courseware "The Meaning and Properties of Fractions, General Division", please click on the "The Meaning and Properties of Fractions ppt, General Division" ppt tag.

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Update Time: 2024-11-18

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

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