Percent Error Practice

Percent Error Practice

Read each problem carefully and calculate the percent error. Round your answers to the nearest tenth of a percent.

1. Sarah estimated the length of a table to be 150 cm. The actual length of the table is 160 cm. What is the percent error?

2. A scientist measured the mass of a rock to be 300 grams. The actual mass of the rock is 320 grams. What is the percent error?

3. Percent error is calculated by finding the absolute difference between the estimated value and the actual value, dividing by the   value, and then multiplying by 100%.

4. If the estimated value is 50 and the actual value is 40, the error is  .

5. A student predicted that there would be 25 apples on a tree. There were actually 30 apples. Which of the following is the correct setup to find the percent error?

6. A percent error of 0% means the estimated value was exactly correct.

7. It is possible to have a negative percent error.

8. John estimated the weight of his dog to be 45 pounds. When he took his dog to the vet, the actual weight was 50 pounds. What was John's percent error?

9. A recipe calls for 2 cups of flour. Emily accidentally used 2.5 cups of flour. What is the percent error in her measurement?