"Finding what fraction of a number is another number" PPT courseware on the meaning and properties of fractions

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"Finding what fraction of a number is another number" PPT courseware on the meaning and properties of fractions

1. Review old knowledge and introduce new lessons

1. Fill in the answers on the question paper and see who can complete it correctly and quickly.

Express the quotient of each equation below in terms of fractions.

5÷9＝( ) 14÷17＝( ) 8÷15＝( )

2. Question: How did you fill it out so quickly? How did you do it?

Because the dividend is equivalent to the numerator of the fraction, the divisor is equivalent to the denominator of the fraction.

2. Use problem solving to explore new knowledge

1. Example 3: Xiaoxin’s family raises 7 geese, 10 ducks, and 20 chickens. What fraction of the number of geese are there as compared to ducks? How many times more chickens are there than ducks?

2. Students report after completion. The number of geese is that of ducks ( ); the number of chickens is twice that of ducks.

Follow-up question: How did you get twice as many chickens as ducks? 20÷10＝2

3. Discussion: How did you get the number of geese to be ducks ( )?

①Start with the meaning of fractions. Find what fraction of the number of geese is the number of ducks, that is, find what fraction of 7 is 10. Think of 10 as a whole, divide it into 10 equal parts, 1 for each part, 7 is the whole ().

②Start with the multiple relationship. To find out what fraction of the number of geese is that of ducks, the number of ducks is used as the standard. It can be calculated by division. The formula is: 7÷10=().

3. Comprehensive application to consolidate understanding

Please complete it independently and then share ideas with the group.

1. "Do it" on page 50 of the textbook, question 2.

The zoo has 9 elephants and 4 golden monkeys. What fraction of the number of golden monkeys are there than elephants?

2. Question 6 on page 51 of the textbook.

The diameter of the thickest part of this spindle tree is 5 m. What fraction of the longest diameter is the length of a desk?

4. Summarize the gains and deepen understanding

What new gains have you gained through learning? Any questions?

5. Homework arrangement

Homework: Exercise 12 on page 52, questions 9 and 10.

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Update Time: 2024-10-03

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

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