Åk 6–9
  • Start
  • 1. Welcome to Percent
  • 2. Presentation of the Concept
  • 3. Calculating with Percent
  • 4. Change in Percent
  • 5. Percentage Points and Per mille
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    English/عربي
    4.5 Exercise – Changes in percent
    1. Write the new value:
    a) 75 increases by 20 %
    b) 320 decreases by 20 %
    c) 110 increases by 10 %
    d) 800 increases by 7 %
    e) 140 decreases by 5 %
    f) 14 increases by 250 %
     

    		 
    2. Write the percentual change:
    a) 100 decreases to 60
    b) 100 increases to 160
    c) 70 increases to 105
    d) 970 decreases to 7
    e) 40 decreases to 38
    f) 18 increases to 180
     
    		 
    3. A mobile telephone from 1996 weighed 200 g.  A year later a new model weight 85 g.  Write a mathematical expression and calculate the proportion of decrease in weight.
     
     

    		 
    4. In 2002, gasoline cost 8.4 kr /l.  Today it costs 10.8 kr/l.  Write the mathematical expression and calculate the proportion of increase in price.  Round your answer to tenths.
     
     
    		 
    5. A two year old child is on average 86 cm tall.  A three year old is on average 92 cm.  Write a mathematical expression and calculate the proportional increase.  Round your answer to a whole number in percent.
     
     
    		 
    6. A store decreased the price of a camera from 900 kr to 783.  Write a mathematical expression and calculate the rate of change.  Round your answer to three decimals.
     
     
    		 
    7. After a rain storm, the mass of a water holder increased from 10.4 kg to 13.6.  Write a mathematical expression and calculate the rate of change.  Round your answer to three decimals.
     
     
    		 
    8. You deposit 30,000 kr into a savings account with a yearly interest rate of 6 %.  After 3 years, you have 35,730.  Write a mathematical expression and calculate the rate of change.