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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 988 · 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 702 × 62? (Round each number first.) (a) 4200 (b) 420000 (c) 84000 (d) 42000
  2. 2.Which is closest to 794 ÷ 39? (a) 10 (b) 200 (c) 20 (d) 40
  3. 3.Round 93.57 to one decimal place. =
  4. 4.Round 68891 to the nearest hundred.
  5. 5.Which is closest to 298 + 399 + 404? (a) 1200 (b) 1000 (c) 1300 (d) 1100
  6. 6.Which is closest to 499 × 70? (Round each number first.) (a) 3500 (b) 350000 (c) 70000 (d) 35000
  7. 7.Which is closest to 797 + 305 + 395? (a) 1400 (b) 1700 (c) 1600 (d) 1500
  8. 8.Round 35.94 to one decimal place. =
  9. 9.Round 11.34 to one decimal place. =
  10. 10.Which is closest to 302 × 39? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
  11. 11.Round 81.78 to one decimal place. =
  12. 12.Which is closest to 1200 ÷ 39? (a) 300 (b) 15 (c) 60 (d) 30
  13. 13.Round 34.41 to one decimal place. =
  14. 14.Which is closest to 202 + 197 + 696? (a) 1200 (b) 1000 (c) 1300 (d) 1100
  15. 15.Round 38.77 to one decimal place. =
  16. 16.Which is closest to 2507 ÷ 49? (a) 25 (b) 100 (c) 50 (d) 500
  17. 17.Round 70709 to the nearest ten.
  18. 18.Which is closest to 4499 ÷ 51? (a) 900 (b) 180 (c) 90 (d) 45
  19. 19.Which is closest to 898 × 51? (Round each number first.) (a) 450000 (b) 45000 (c) 4500 (d) 90000
  20. 20.Which is closest to 596 × 79? (Round each number first.) (a) 4800 (b) 480000 (c) 96000 (d) 48000
  21. 21.Which is closest to 601 × 51? (Round each number first.) (a) 3000 (b) 300000 (c) 60000 (d) 30000
  22. 22.Which is closest to 701 + 903 + 902? (a) 2500 (b) 2600 (c) 2700 (d) 2400
  23. 23.Which is closest to 801 + 404 + 503? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  24. 24.Which is closest to 896 ÷ 29? (a) 15 (b) 300 (c) 60 (d) 30
  25. 25.Round 89164 to the nearest thousand.
  26. 26.Round 48.39 to one decimal place. =
  27. 27.Round 93642 to the nearest ten.
  28. 28.Which is closest to 796 × 31? (Round each number first.) (a) 240000 (b) 24000 (c) 2400 (d) 48000
  29. 29.Which is closest to 3203 ÷ 39? (a) 800 (b) 80 (c) 160 (d) 40
  30. 30.Which is closest to 798 + 102 + 202? (a) 1100 (b) 1000 (c) 1300 (d) 1200
  31. 31.Which is closest to 204 × 78? (Round each number first.) (a) 1600 (b) 16000 (c) 160000 (d) 32000
  32. 32.Round 29003 to the nearest thousand.
  33. 33.Round 4351 to the nearest hundred.
  34. 34.Round 58.18 to one decimal place. =
  35. 35.Which is closest to 104 + 897 + 505? (a) 1500 (b) 1700 (c) 1600 (d) 1400
  36. 36.Round 34.22 to one decimal place. =
  37. 37.Round 57.91 to one decimal place. =
  38. 38.Which is closest to 303 × 29? (Round each number first.) (a) 900 (b) 9000 (c) 18000 (d) 90000
  39. 39.Round 49.18 to one decimal place. =
  40. 40.Which is closest to 2794 ÷ 41? (a) 70 (b) 140 (c) 35 (d) 700

Answer key

  1. 42000
  2. 20
  3. 93.6
  4. 68900
  5. 1100
  6. 35000
  7. 1500
  8. 35.9
  9. 11.3
  10. 12000
  11. 81.8
  12. 30
  13. 34.4
  14. 1100
  15. 38.8
  16. 50
  17. 70710
  18. 90
  19. 45000
  20. 48000
  21. 30000
  22. 2500
  23. 1700
  24. 30
  25. 89000
  26. 48.4
  27. 93640
  28. 24000
  29. 80
  30. 1100
  31. 16000
  32. 29000
  33. 4400
  34. 58.2
  35. 1500
  36. 34.2
  37. 57.9
  38. 9000
  39. 49.2
  40. 70

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