"Solving Problems with Proportions" Comparison and Proportional Distribution PPT Courseware 2

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"Solving Problems with Proportions" Comparison and Proportional Distribution PPT Courseware 2

1. Foreshadowing of old knowledge

It is known that the ratio of the number of boys to the number of girls in Class 1 of sixth grade is 3:4

(1)The ratio of the number of boys to the number of students in the class is ( ): ( )

(2)The number of boys in the class is ( )/( )

(3)The ratio of the number of girls to the number of students in the class is ( ): ( )

(4)The number of girls accounts for ( )/( ) of the whole class

Mom has 10 pieces of candy. If she gives 4 pieces to her younger brother and 6 pieces to her brother, what is the ratio of the number of pieces of candy between the younger brother and the older brother?

Is this an average score?

The ratio of the number of pieces of candy between the younger brother and the older brother is 2:3

1. There are 50 students in a class. The ratio of girls to boys is 3:2. How many boys and girls are there?

Total number of copies: 3+2=5

Number of boys: 50×3/5=30 (person)

Number of girls: 50×2/5=20 (person)

Answer: There are 30 boys and 20 girls.

2. Divide 560 books among second and third grade students at a ratio of 4:3. How many books are there for each grade?

Total number of copies: 4+3=7

Second grade: 560×4/7=320 (this book)

Third grade: 560×3/7=240 (this book)

Answer: Second grade students are allocated 320 books, and third grade students are allocated 240 books.

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Update Time: 2024-11-18

This template belongs to Mathematics courseware Western Normal University Edition Sixth Grade Mathematics Volume 1 industry PPT template

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