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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 814 · 40 questions
TalentJR

The method (Round, then calculate): Round each number to the nearest ten, hundred or whole number. Do the easy sum with the rounded numbers. Pick the option nearest to it. To round a number, look at the digit after the place you keep: 5 or more goes up, less than 5 stays.

NameDateTime takenScore ___ / 40
  1. 1.Which is closest to 299 × 21? (Round each number first.) (a) 6000 (b) 12000 (c) 60000 (d) 600
  2. 2.Which is closest to 4508 ÷ 51? (a) 180 (b) 90 (c) 900 (d) 45
  3. 3.Round 49.32 to one decimal place. =
  4. 4.Round 78637 to the nearest ten.
  5. 5.Which is closest to 1491 ÷ 49? (a) 300 (b) 15 (c) 60 (d) 30
  6. 6.Which is closest to 895 + 202 + 203? (a) 1400 (b) 1300 (c) 1200 (d) 1500
  7. 7.Which is closest to 198 + 103 + 698? (a) 1200 (b) 1000 (c) 1100 (d) 900
  8. 8.Round 78791 to the nearest thousand.
  9. 9.Which is closest to 605 + 98 + 695? (a) 1300 (b) 1400 (c) 1600 (d) 1500
  10. 10.Round 14590 to the nearest hundred.
  11. 11.Round 84286 to the nearest ten.
  12. 12.Which is closest to 904 × 51? (Round each number first.) (a) 450000 (b) 90000 (c) 45000 (d) 4500
  13. 13.Round 21518 to the nearest thousand.
  14. 14.Which is closest to 2702 ÷ 29? (a) 180 (b) 900 (c) 45 (d) 90
  15. 15.Which is closest to 497 × 29? (Round each number first.) (a) 15000 (b) 1500 (c) 150000 (d) 30000
  16. 16.Round 20427 to the nearest ten.
  17. 17.Which is closest to 899 + 703 + 505? (a) 2200 (b) 2000 (c) 2100 (d) 2300
  18. 18.Round 36.29 to one decimal place. =
  19. 19.Round 79.18 to one decimal place. =
  20. 20.Round 31.62 to one decimal place. =
  21. 21.Which is closest to 200 + 903 + 695? (a) 2000 (b) 1900 (c) 1700 (d) 1800
  22. 22.Which is closest to 897 + 598 + 304? (a) 2000 (b) 1700 (c) 1800 (d) 1900
  23. 23.Which is closest to 1509 ÷ 29? (a) 25 (b) 50 (c) 100 (d) 500
  24. 24.Round 35562 to the nearest hundred.
  25. 25.Which is closest to 404 + 399 + 302? (a) 1100 (b) 1000 (c) 1300 (d) 1200
  26. 26.Which is closest to 1509 ÷ 31? (a) 500 (b) 50 (c) 25 (d) 100
  27. 27.Round 19.87 to one decimal place. =
  28. 28.Which is closest to 701 × 48? (Round each number first.) (a) 350000 (b) 35000 (c) 3500 (d) 70000
  29. 29.Round 88549 to the nearest thousand.
  30. 30.Which is closest to 99 + 196 + 204? (a) 600 (b) 500 (c) 400 (d) 700
  31. 31.Round 77.48 to one decimal place. =
  32. 32.Round 98.09 to one decimal place. =
  33. 33.Which is closest to 797 × 88? (Round each number first.) (a) 7200 (b) 144000 (c) 720000 (d) 72000
  34. 34.Which is closest to 401 + 400 + 203? (a) 1100 (b) 1200 (c) 1000 (d) 900
  35. 35.Which is closest to 2008 ÷ 39? (a) 25 (b) 500 (c) 100 (d) 50
  36. 36.Which is closest to 698 + 401 + 402? (a) 1600 (b) 1500 (c) 1400 (d) 1700
  37. 37.Which is closest to 603 × 18? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  38. 38.Round 23.19 to one decimal place. =
  39. 39.Which is closest to 3002 ÷ 49? (a) 600 (b) 60 (c) 120 (d) 30
  40. 40.Round 93.36 to one decimal place. =

Answer key

  1. 6000
  2. 90
  3. 49.3
  4. 78640
  5. 30
  6. 1300
  7. 1000
  8. 79000
  9. 1400
  10. 14600
  11. 84290
  12. 45000
  13. 22000
  14. 90
  15. 15000
  16. 20430
  17. 2100
  18. 36.3
  19. 79.2
  20. 31.6
  21. 1800
  22. 1800
  23. 50
  24. 35600
  25. 1100
  26. 50
  27. 19.9
  28. 35000
  29. 89000
  30. 500
  31. 77.5
  32. 98.1
  33. 72000
  34. 1000
  35. 50
  36. 1500
  37. 12000
  38. 23.2
  39. 60
  40. 93.4

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