Rounding and Estimation Practice Hiranga T3 Week 3

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Date:

📚 Part 1: Multiple Choice

Use rounding and estimation to choose the best answer.

1. Round 463 to the nearest ten.

460

470

463

2. Round 7.86 kg to the nearest 0.1 kg.

7.9 kg

7.8 kg

8.0 kg

3. Which is the best estimate (to the nearest dollar) for $23.40 + $15.75 + $9.60?

$48

$49

$50

4. Check all that apply: Which are reasonable estimates for 1.98 + 2.03?

Round to whole numbers: 2 + 2 = 4

Round to one decimal: 2.0 + 2.0 = 4.0

Round both to 0: 0 + 0 = 0

✏️ Part 2: Short Answers

Use the degree of precision needed for each context. Show your reasoning.

5. Round 6,842 to the nearest hundred. Give your answer and show how you decided.

6. A family drives 38.6 km to the beach and 39.4 km back. Estimate the total distance using rounding to the nearest kilometre, then calculate the exact total to check your estimate. Show working.

7. A jacket costs $14.95 and a hat costs $8.60. Estimate the total cost by rounding to the nearest dollar. Is your estimate an overestimate or an underestimate of the exact total? Explain briefly.

8. The overnight temperature was −2.6°C and by midday it was 3.4°C. Round both temperatures to the nearest degree and estimate the change in temperature. Then state the exact change.

9. Quick check: A student calculated 47 × 6 = 282. Use rounding to the nearest ten to check whether this product seems reasonable. Write a one- or two-line explanation.