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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 956 · 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 897 × 58? (Round each number first.) (a) 5400 (b) 54000 (c) 540000 (d) 108000
  2. 2.Round 32.94 to one decimal place. =
  3. 3.Round 55133 to the nearest hundred.
  4. 4.Which is closest to 97 + 204 + 896? (a) 1100 (b) 1300 (c) 1400 (d) 1200
  5. 5.Round 14691 to the nearest ten.
  6. 6.Which is closest to 2491 ÷ 49? (a) 50 (b) 500 (c) 100 (d) 25
  7. 7.Round 89.87 to one decimal place. =
  8. 8.Which is closest to 1994 ÷ 51? (a) 20 (b) 400 (c) 80 (d) 40
  9. 9.Which is closest to 197 × 48? (Round each number first.) (a) 1000 (b) 10000 (c) 100000 (d) 20000
  10. 10.Round 11733 to the nearest thousand.
  11. 11.Which is closest to 797 × 20? (Round each number first.) (a) 1600 (b) 32000 (c) 16000 (d) 160000
  12. 12.Which is closest to 202 + 795 + 895? (a) 2000 (b) 1800 (c) 1900 (d) 2100
  13. 13.Which is closest to 2391 ÷ 39? (a) 60 (b) 30 (c) 600 (d) 120
  14. 14.Round 71982 to the nearest thousand.
  15. 15.Which is closest to 202 + 504 + 298? (a) 1000 (b) 1200 (c) 900 (d) 1100
  16. 16.Round 22.82 to one decimal place. =
  17. 17.Which is closest to 702 × 49? (Round each number first.) (a) 70000 (b) 350000 (c) 3500 (d) 35000
  18. 18.Round 47.78 to one decimal place. =
  19. 19.Round 26.51 to one decimal place. =
  20. 20.Which is closest to 99 + 698 + 95? (a) 900 (b) 800 (c) 1100 (d) 1000
  21. 21.Which is closest to 792 ÷ 19? (a) 40 (b) 80 (c) 20 (d) 400
  22. 22.Round 46494 to the nearest thousand.
  23. 23.Which is closest to 200 × 18? (Round each number first.) (a) 4000 (b) 40000 (c) 400 (d) 8000
  24. 24.Round 67.78 to one decimal place. =
  25. 25.Which is closest to 104 + 497 + 195? (a) 1000 (b) 900 (c) 700 (d) 800
  26. 26.Which is closest to 609 ÷ 21? (a) 60 (b) 30 (c) 15 (d) 300
  27. 27.Which is closest to 697 × 90? (Round each number first.) (a) 6300 (b) 63000 (c) 126000 (d) 630000
  28. 28.Which is closest to 897 × 62? (Round each number first.) (a) 540000 (b) 5400 (c) 54000 (d) 108000
  29. 29.Which is closest to 796 + 297 + 103? (a) 1300 (b) 1100 (c) 1200 (d) 1400
  30. 30.Round 87596 to the nearest ten.
  31. 31.Round 98.82 to one decimal place. =
  32. 32.Round 18.58 to one decimal place. =
  33. 33.Which is closest to 1207 ÷ 39? (a) 300 (b) 60 (c) 30 (d) 15
  34. 34.Round 39.49 to one decimal place. =
  35. 35.Which is closest to 797 + 197 + 199? (a) 1300 (b) 1400 (c) 1200 (d) 1100
  36. 36.Which is closest to 897 ÷ 29? (a) 60 (b) 15 (c) 300 (d) 30
  37. 37.Which is closest to 2802 ÷ 41? (a) 35 (b) 700 (c) 140 (d) 70
  38. 38.Round 17.33 to one decimal place. =
  39. 39.Round 78.18 to one decimal place. =
  40. 40.Which is closest to 3498 ÷ 51? (a) 35 (b) 700 (c) 70 (d) 140

Answer key

  1. 54000
  2. 32.9
  3. 55100
  4. 1200
  5. 14690
  6. 50
  7. 89.9
  8. 40
  9. 10000
  10. 12000
  11. 16000
  12. 1900
  13. 60
  14. 72000
  15. 1000
  16. 22.8
  17. 35000
  18. 47.8
  19. 26.5
  20. 900
  21. 40
  22. 46000
  23. 4000
  24. 67.8
  25. 800
  26. 30
  27. 63000
  28. 54000
  29. 1200
  30. 87600
  31. 98.8
  32. 18.6
  33. 30
  34. 39.5
  35. 1200
  36. 30
  37. 70
  38. 17.3
  39. 78.2
  40. 70

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