Grade 7 Math: Understanding Percent Error
This worksheet helps 7th-grade students understand and calculate percent error in various real-world scenarios.
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Grade 7 Math: Understanding Percent Error
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Read each question carefully and show your work for calculations. Remember, percent error is calculated as: (|Approximate Value - Exact Value| / |Exact Value|) × 100%.
1. A student estimated the length of a desk to be 150 cm. The actual length of the desk is 155 cm. What is the percent error of the student's estimate?
2. Sarah predicted that there would be 20 apples in a basket. When she counted them, she found there were actually 25 apples. What is the percent error of Sarah's prediction?
5%
20%
25%
80%
3. The formula for percent error is the absolute difference between the approximate and exact values, divided by the , multiplied by 100%.
4. A percent error of 0% means the approximate value is exactly the same as the exact value.
True
False
5. A scientist measured the mass of a chemical to be 12.8 grams. The actual mass of the chemical is 12.5 grams. Calculate the percent error of the measurement.
6. A baker estimated that a recipe would yield 24 cookies. After baking, she counted 30 cookies. What is the percent error of her estimate?
7. Use the ruler below to estimate the length of the pencil, then calculate the percent error if the actual length is 10 cm.
Estimated Length: cm
Percent Error: