Study WAEC questions on Approximation (+PDF)

These WAEC questions on Approximation are all from its sub-topics in the WAEC MATH SYLLABUS.

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WAEC Approximation questions

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1. Approximate 0.0033780 to 3 significant figures.

A. 338
B. 0.338
C. 0.00338
D. 0.003

2. Express 302.10495 correct to five significant figures. 

A. 302.10
B. 302.11
C. 302.105
D. 302.1049

3. A house bought for ₦100,000 was later auctioned for ₦80,000. Find the loss percent. 

A. 20%
B. 30%
C. 40%
D. 50%

4. A the length and breadth of a rectangular lawn as 59.6m and 40.3m respectively instead of 60m and 40m. What is the percentage error in his calculation of the perimeter of the lawn?  

A. 10%
B. 1.4%
C. 0.7%
D. 0.1%

5.  The length of an exercise book is given as 20cm correct to the nearest centimetre. In which of the following ranges of possible measurements does the actual length lie?

A. 19.5 – 20.5cm
B. 19.1 – 20.9cm
C. 19.9 – 20.1cm
D. 19.95 – 20.05cm

6. A piece of cloth was measured as 6.10m. If the actual length of the cloth is 6.35m, find the percentage error, correct to 2 decimal places.

A. 3.05%
B. 3.94%
C. 15.00%
D. 25.00%

7. A boy estimated his transport fare for a journey as ₦190 instead of ₦200. Find the percentage error in his estimate.

A. 95%
B. 47.5%
C. 5.26%
D. 5%

8. Calculate, to two significant figures, the percentage error in approximating 0.375 to 0. 

A. 2.0
B. 2.5
C. 6.6
D. 6.7

9. Given that x  0.01202 correct to 3 significant figures, which of the following cannot be the actual value of x?

A. 0.01014
B. 0.01021
C. 0.01015
D. 0.01016

10. The student measured the length of a room and obtained the measurement of 3.99m. If the percentage error of his measurement was 5% and his own measurement was smaller than the length, what is the length of the room?

A. 3.78m
B. 3.80m
C. 4.18m
D. 4.20m

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