APPROXIMATIONS

SET 1

1. Round 72.456 to 2 decimal places.
2. Round 0.007486 to 3 significant figures.
3. Estimate the value of 49 × 21 by rounding to the nearest ten.
4. Round 9384 to the nearest hundred.
5. Round 9384 to the nearest thousand.
6. What is the value of the digit 7 in the number 57,349?
7. Round 6.397 to 1 decimal place.
8. Estimate the value of √82 to 1 decimal place.
9. Round 0.00894 to 2 significant figures.
10. Which number is more accurate: 7.1 or 7.10? Explain why.
11. Give 4.328 correct to 2 decimal places.
12. Estimate the value of 789 ÷ 26 by rounding to 1 significant figure.
13. Round 0.08961 to 3 decimal places.
14. Write 204.060 to 4 significant figures.
15. Round 1349.96 to the nearest ten.
16. Estimate the total of 34.6 + 45.8 + 19.3 by rounding each to the nearest whole number.
17. Round 14.9999 to 2 decimal places.
18. Which is more accurate: 0.076 or 0.0760? Explain.
19. Round 8.735 to 2 significant figures.
20. Estimate the value of 121 × 4.9 using appropriate rounding.

SET 2

1. Round 72.456 to 2 decimal places.
2. Round 0.007486 to 3 significant figures.
3. Estimate the value of 49 × 21 by rounding to the nearest ten.
4. Round 9384 to the nearest hundred.
5. Round 9384 to the nearest thousand.
6. What is the value of the digit 7 in the number 57,349?
7. Round 6.397 to 1 decimal place.
8. Estimate the value of √82 to 1 decimal place.
9. Round 0.00894 to 2 significant figures.
10. Which number is more accurate: 7.1 or 7.10? Explain why.
11. Estimate the value of (3377 × 8237) ÷ (6745 × 675).
12. Estimate √198 × √52 by first rounding each number to the nearest whole number.
13. Use estimation to evaluate (999 + 249) ÷ 51.
14. Estimate the value of (3.89 × 47.8) ÷ 0.96 by rounding each to 1 significant figure.
15. Simplify and estimate the expression (19.7² − 0.48) ÷ 3.1.
16. Estimate (5.987 × 4.134) + (3.865 ÷ 1.95).
17. Estimate the total cost of 7 items priced at TZS 23,879 each.
18. A car travels 498.6 km in 6.95 hours. Estimate the average speed.
19. Evaluate (104.3 + 98.9 + 92.5) ÷ 3 using estimation.
20. Use approximation to evaluate (√745 + √260) ÷ 2.