Estimation and Limits of Accuracy — Questions

IGCSE Mathematics (0580) practice questions. Work through each question before checking the solutions page.

Question 1

[1](a)Round 3.14159 to 2 significant figures.

Question 2

[2](a)A length is measured as 12 cm, correct to the nearest cm. Write down the lower and upper bounds of the actual length.

Question 3

[3](a)A rectangle has length 8.4 cm and width 5.2 cm, both correct to 1 decimal place. Calculate the upper bound of the area.

Question 4

[1](a)Round 0.04567 to 2 significant figures.

Question 5

[2](a)A length is given as 3.5 cm, correct to 1 decimal place. Write the lower and upper bounds.

Question 6

[2](a)Estimate the value of 198 × 51 by rounding each number to 1 significant figure.

Question 7

[3](a)A length of 6.0 cm and a width of 4.0 cm are each correct to the nearest mm. Calculate the lower bound of the area.

Question 8

[1](a)Round 6.298 to 2 decimal places.

Question 9

[2](a)Explain why rounding both numbers up before multiplying can give a poor estimate for a calculation like 2.4 × 8.7.

Question 10

[2](a)Two measurements of 8.4 cm and 5.2 cm are each correct to 1 d.p. Calculate the upper bound of their product.

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