MathematicsJSS 3en

📊 Approximation and Percentage Error

This quiz covers rounding, approximation techniques, and calculating percentage error in real-world contexts. **What you'll learn:** - Round numbers to significant figures and decimal places - Estimate calculations using approximate values - Calculate percentage error and relative error - Apply approximation to practical problems

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Questions in this quiz

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Question 1
What is $7.849$ rounded to 2 decimal places?
Question 2
Round $23567$ to 3 significant figures.
Question 3
Round $0.004672$ to 2 significant figures: ___
Question 4
When we approximate $3.75 imes 4.2$ using $4 imes 4 = 16$ , we are rounding both numbers up.
Question 5
A student measures the length of a desk as $1.2$ m, but the actual length is $1.25$ m. What is the absolute error?
Question 6
A temperature is recorded as $25°C$ , but the true temperature is $24°C$ . What is the percentage error?
Question 7
A shopkeeper estimates the cost of goods as $₦850$ , but the actual cost is $₦900$ . The percentage error is ___
Question 8
When approximating $\frac{48.7}{4.95}$ , which pair of approximations would give the most reasonable estimate?
Question 9
A student's test score was recorded as $78$ out of $100$ , but it should have been $75$ out of $100$ . What is the percentage error in the recorded score?
Question 10
A length is measured as $15.4$ cm, with a percentage error of $2.6\%$ . Which of the following is closest to the actual length?