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Calculating Percentage Error Practice Problems


1. A student measures the mass of an object as 35 grams, while the true mass is 40 grams. Calculate the percentage error.


2. The estimated population of a city is 1.5 million people, but the true population is 1.8 million people. Determine the percentage error.


3. A thermometer reads the temperature as 25°C, while the actual temperature is 28°C. Calculate the percentage error.


4. The estimated value of a property is $200,000, but the actual value is $225,000. Determine the percentage error.


5. A lab experiment yields a result of 3.6 m/s for the speed of an object, while the accepted value is 4.2 m/s. Calculate the percentage error.


6. A measurement of an angle yields 45 degrees, while the true angle is 50 degrees. Determine the percentage error.


7. The estimated time of arrival for a train is 8:30 AM, but it actually arrives at 8:45 AM. Calculate the percentage error.


8. A student measures the volume of a liquid as 75 mL, while the actual volume is 80 mL. Determine the percentage error.


9. The estimated weight of a package is 2.5 kg, but the actual weight is 2.2 kg. Calculate the percentage error.


10. A manufacturer claims that a product has a 95% success rate, but testing shows it has a 90% success rate. Determine the percentage error.


11. The estimated length of a rope is 2 meters, but the actual length is 2.5 meters. Calculate the percentage error.


12. A scale measures the weight of an object as 150 pounds, while the true weight is 160 pounds. Determine the percentage error.


13. The estimated value of an investment is $10,000, but it actually yields $8,500. Calculate the percentage error.


14. A student predicts the height of a tower as 100 meters, while the actual height is 120 meters. Determine the percentage error.


15. The estimated cost of a project is $50,000, but the actual cost is $60,000. Calculate the percentage error.


16. A lab experiment measures the pH of a solution as 7.5, while the true pH is 8.0. Determine the percentage error.


17. The estimated distance between two cities is 100 kilometers, but the actual distance is 110 kilometers. Calculate the percentage error.


18. A speedometer reads the speed as 60 km/h, while the actual speed is 55 km/h. Determine the percentage error.


19. The estimated time for completing a task is 3 hours, but it actually takes 3.5 hours. Calculate the percentage error.


20. A student measures the density of a substance as 1.2 g/cm³, while the accepted value is 1.0 g/cm³. Determine the percentage error.


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