Åk 6–9

English/عربي
5.3 Exercise – Percentage points and per mille
1. The circle diagram shows the distribution of how students in a class get to school.
 a) Calculate the difference in percentage points the proportion students who get a ride by car with the proportion to those who walk to school? b) How large is the percentual difference between the students who get a ride by car and those who walk to school. c) Calculate the difference in percentage points between the proportion students who take the bus and the proportion who cycle to school? d) How big is the percentual difference between the proportion of students who take the bus to school and the proportion that cycle to school.

2. The student did a survey to find out the class’s favorite time of the year.  The survey is presented in the circle diagram below:
 a) Calculate the difference in percentage points between winter and spring? b) Calculate the difference in percentage points between fall and the rest of the seasons? c) How big is the percentual difference between fall and winter? d) How big is the percentual difference between spring, as well as winter and summer?

3. Proportion of computer per household (% of households)
 a) If 130 households participated in the survey, what is the difference in numbers between the households that have two computers and the household that have no computers? b) How many times greater is the number of households with one computer than the number of household without computers?

4. How many per mille is 5 of 2,500?

5. Calculate 18 ‰ of 1,500?

6. 100 ‰ of a number is 200. What is the number?

7. Lasse’s age is 40 % of Bosse’s age.  How many percent of Lasse’s age is Bosse’s age? Write a mathematical expression and calculate the proportion.