"Fabric Art Interest Group" PPT courseware 4

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"Fabric Art Interest Group" PPT courseware 4

Review the past and learn the new

1. Find the quantity in 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) 4/5 of Xiaoli’s weight is as much as the weight of water contained in her body.

2. Write the quantitative relationship expressions for each of the above questions.

(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) 4/5 of Xiaoli’s weight is as much as the weight of water contained in her body.

In conclusion

What is known about this type of problem? What do you want?

(We know what fraction of a number is, how can we find this number?)

What are the characteristics of this type of question? (The unit "1" is unknown.)

Solution:

1. Solution to a series of equations:

(1) Determine the unit "1" and assume the unknown number X.

(2) Find equivalence relationships based on sentences containing fractions.

(3) Use multiplication equations to solve the problem based on the meaning of multiplying a number by a fraction.

Amount of unit "1" × corresponding fraction = corresponding amount

2. Arithmetic solution:

Use division calculations according to "The Meaning of Fraction Division".

The amount of unit "1" = the corresponding amount ÷ the corresponding fraction

Summary of this lesson

Given what fraction of a number is, what is the number?

1. Solution to a series of equations:

(1) Determine the unit "1" and assume the unknown number X.

(2) Find equivalence relationships based on sentences containing fractions.

(3) Use multiplication equations to solve the problem based on the meaning of multiplying a number by a fraction.

Amount of unit "1" × corresponding fraction = corresponding amount

2. Arithmetic solution:

Use division calculations according to "The Meaning of Fraction Division".

The amount of unit "1" = the corresponding amount ÷ the corresponding fraction

3. Determining whether a quantity is unit "1" mainly depends on the specific situation:

1. Generally speaking, what fraction of a certain number, "a certain number" is the unit "1".

2. Whoever is a few fractions more or less than someone else, the quantity after the word "ratio" is the unit "1".

3 Who is a fraction of whom? The quantity after the word "is" is the unit "1".

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Update Time: 2024-10-05

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