Lesson 12: Significant Figures

Year 10 Mathematics Unit 1 — Block B | Worksheet



Multiple Choice

Q1. How many significant figures does 0.00450 have?

A) 2 B) 3 C) 4 D) 5

Q2. Round 4.0756 to 3 significant figures.

A) 4.07 B) 4.08 C) 4.076 D) 4.075

Q3. A rectangle measures 5.2 cm by 3.8 cm. What is its area, given to the correct number of significant figures?

A) 19.76 cm^2 B) 19.8 cm^2 C) 20 cm^2 D) 19 cm^2

Q4. Which measurement has the most significant figures?

A) 0.0040 B) 4.00 C) 400 D) 4.0

Q5. A scientist records a mass as 25.0 g. A student records the same mass as 25 g. Which statement is true?

A) Both measurements have the same precision B) 25.0 g is more precise C) 25 g is more precise D) The trailing zero in 25.0 is not significant

Short Answer

Q6. How many significant figures are in each of the following: (a) 0.00560, (b) 1200, (c) 3.14159? (2 marks)

Q7. Calculate 4.25 x 2.1, giving your answer to the correct number of significant figures. Explain your reasoning. (3 marks)

Q8. Explain why it is important for scientists and engineers to report measurements with the correct number of significant figures. Use an example involving a bridge design. (3 marks)

Key Formulas