"Proportional Distribution of Application Questions" Understanding Comparison PPT Courseware

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"Proportional Distribution of Application Questions" Understanding Comparison PPT Courseware

The ratio of boys to girls in fourth grade is 6:5. What did you learn from this information?

(1) The number of boys is the number of girls ( );

(2) The number of girls is ( ) the number of boys, and the ratio of the number of girls to the number of boys is ( );

(3) The number of boys in the class is ( ), and the ratio of the number of boys to the class is ( );

(4) The number of boys in the class is ( ), and the ratio of the number of boys in the class to the number of boys is ( );

(5) The number of girls in the whole class ( ), the number of girls in the class ( );

(6) The size of the class is the number of girls ( ), and the ratio of the class size to the number of girls is ( ).

I prepared a 500ml bottle of diluent at a ratio of 1:4. What are the volumes of the concentrate and water?

500÷(1+4)=100(ml)

100×1=100（ml）

100×1=100（ml）

Answer: The volume of concentrated solution is 100ml, and the volume of water is 400ml.

What are the differences between the two problem-solving ideas?

Solution 1: First find the number, and then find the fraction.

Solution 2: First find the total score, and then find the weight of each part.

Rules for solving proportional application problems:

(1) Find the total number of copies.

(2) Find out what fraction of each part accounts for the total number.

(3) Use multiplication to calculate what fraction of a number is.

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"Proportional Distribution of Application Questions" Understanding Ratio PPT Courseware 2:

"Application Questions on Proportional Distribution" Understanding Ratio PPT Courseware 2 What is Proportional Distribution? In life, a quantity is distributed according to a certain ratio. This method of allocation is called proration. Basic characteristics of proportional word problems: Known: 1. Total number..

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Update Time: 2024-10-19

This template belongs to Mathematics courseware Jiangsu Education Edition Sixth Grade Mathematics Volume 1 industry PPT template

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