Rounding, Estimation & Bounds Quiz

1. Round $4.5672$ to 2 decimal places.

• A. A. 4.56
• B. B. 4.57
• C. C. 4.6
• D. D. 4.567

2. Round $0.003842$ to 2 significant figures.

• A. A. 0.0038
• B. B. 0.004
• C. C. 0.0039
• D. D. 0.00

3. A length of $12.6\text{ cm}$ is given to the nearest $0.1\text{ cm}$. What is its upper bound?

• A. A. 12.65 cm
• B. B. 12.6 cm
• C. C. 12.55 cm
• D. D. 13.0 cm

4. Estimate the value of $\dfrac{396 \times 5.1}{19.8}$ by rounding each number to 1 significant figure.

• A. A. 20
• B. B. 100
• C. C. 200
• D. D. 40

5. A rectangle has length $8.4\text{ cm}$ (nearest $0.1\text{ cm}$) and width $5.2\text{ cm}$ (nearest $0.1\text{ cm}$). What is the minimum possible area?

• A. A. $8.35 \times 5.15 = 43.0025\text{ cm}^2$
• B. B. $8.45 \times 5.25 = 44.3625\text{ cm}^2$
• C. C. $8.4 \times 5.2 = 43.68\text{ cm}^2$
• D. D. $8.45 \times 5.15 = 43.5175\text{ cm}^2$