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Authoritative PPT Summary
"Fabric Art Interest Group" PPT courseware
1. Create situations and present problems
1. The number of girls is 3/5 of the whole class. Number of girls = Number of students in the class × 3/5
2. 7/8 of the weight of an apple is 720 kilograms. Apple weight × 7/8 = 720 kilograms
3. The number of story books accounts for 2/5 of the total number of books. Total number of books = number of story books × 2/5
Can you tell their quantitative relationship based on the meaning of the question?
2. Independent learning and group inquiry
Exploration Tips
☆Think about it, what is the relationship between the number of pieces that the first fabric art team has completed and the number of pieces that it plans to complete? Who is known and who is unknown?
☆Think about who is the unit "1", and analyze the quantitative relationship in the question by drawing a line segment diagram.
☆Find out the equivalent relationship in the question based on the line segment diagram, analyze the equivalent relationship, and think about what method is suitable to solve this kind of problem? After completing independently, discuss in the group.
☆Try to solve it independently and communicate in a group. What are you based on? What are the equations based on? How to check?
4. Abstract summary, summary and improvement
★The question type we are learning today is "given what fraction of a number is, what is the number?" fraction application questions.
★Use the method of drawing a line segment diagram to analyze the relationship between the part and the whole quantity. When drawing a line segment diagram, usually draw the unit "1" first.
★Steps:
⑴Determine the unit "1" and assume the unknown number x.
⑵Find the equivalence relationship.
⑶ Solve the equations based on finding what fraction of a number is.
★Arithmetic can solve problems through the following relationships:
Whole quantity = part quantity ÷ fraction of the whole quantity that the part quantity occupies.
5. Consolidate application, expand and improve
1. Complete the quantity relationship expression first, and then solve it.
2. Look at the diagram for the solution.
3. Draw a picture and analyze first, then answer the question.
The brain of a 3-year-old child weighs about 1,000 grams, which is the weight of an adult brain. How many grams does an adult brain weigh?
4. Write the quantity relationship first, and then solve it.
Under artificial breeding conditions, the lifespan of a goldfish can reach 30 years, which is equivalent to 6/11 of an eel. How many years does an eel live?
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"Fabric Art Interest Group" PPT courseware 5:
"Fabric Art Interest Group" PPT Courseware 5 Review: Find unit 1 and write the quantity relationship 1. The quantity of A is 7/8 of B. Quantity relationship: B’s quantity 7/8 = A’s quantity 2. The actual production is equivalent to 1/5 of the plan. Quantity relationship: planned quantity 1/5 = actual..
"Fabric Art Interest Group" PPT courseware 4:
"Fabric Art Interest Group" PPT courseware 4 Review old knowledge and new knowledge 1. Find the quantity of unit 1. (1) The number of story books accounts for 2/5 of the total number of books. (2) Xiao Ming’s weight is 3/8 of his father’s weight. (3) 3/4 of the number of white rabbits is equivalent to the number of black rabbits. (4) Xiaoli body..
"Fabric Art Interest Group" PPT courseware 3:
"Fabric Art Interest Group" PPT Courseware 3 The school library bought 840 new storybooks, which is 3/5 of the original storybooks. How many original storybooks are there in the library? Try this: There is a pile of fertilizer, and transporting 3/8 is exactly 71/2 tons. How many tons are there in this pile of fertilizer? 1. A road costs 50,000..