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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 898 · 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.Round 20.53 to one decimal place. =
  2. 2.Round 17702 to the nearest ten.
  3. 3.Which is closest to 1992 ÷ 41? (a) 100 (b) 500 (c) 50 (d) 25
  4. 4.Which is closest to 300 × 88? (Round each number first.) (a) 54000 (b) 270000 (c) 2700 (d) 27000
  5. 5.Round 13282 to the nearest hundred.
  6. 6.Which is closest to 608 ÷ 21? (a) 60 (b) 300 (c) 15 (d) 30
  7. 7.Which is closest to 2793 ÷ 41? (a) 70 (b) 140 (c) 700 (d) 35
  8. 8.Which is closest to 1792 ÷ 21? (a) 180 (b) 900 (c) 45 (d) 90
  9. 9.Which is closest to 702 × 59? (Round each number first.) (a) 42000 (b) 84000 (c) 420000 (d) 4200
  10. 10.Which is closest to 1507 ÷ 49? (a) 300 (b) 60 (c) 30 (d) 15
  11. 11.Which is closest to 398 + 305 + 395? (a) 1000 (b) 1200 (c) 1300 (d) 1100
  12. 12.Which is closest to 597 × 18? (Round each number first.) (a) 12000 (b) 120000 (c) 1200 (d) 24000
  13. 13.Which is closest to 105 + 201 + 900? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  14. 14.Round 65.26 to one decimal place. =
  15. 15.Which is closest to 305 + 896 + 600? (a) 1800 (b) 2000 (c) 1700 (d) 1900
  16. 16.Which is closest to 404 × 68? (Round each number first.) (a) 28000 (b) 56000 (c) 280000 (d) 2800
  17. 17.Round 87.66 to one decimal place. =
  18. 18.Which is closest to 599 × 38? (Round each number first.) (a) 2400 (b) 24000 (c) 48000 (d) 240000
  19. 19.Round 43.19 to one decimal place. =
  20. 20.Which is closest to 905 + 504 + 896? (a) 2300 (b) 2200 (c) 2400 (d) 2500
  21. 21.Which is closest to 896 + 304 + 504? (a) 1900 (b) 1700 (c) 1800 (d) 1600
  22. 22.Round 79.63 to one decimal place. =
  23. 23.Which is closest to 396 × 20? (Round each number first.) (a) 800 (b) 8000 (c) 80000 (d) 16000
  24. 24.Round 98.06 to one decimal place. =
  25. 25.Which is closest to 1194 ÷ 41? (a) 60 (b) 15 (c) 30 (d) 300
  26. 26.Round 22659 to the nearest thousand.
  27. 27.Which is closest to 297 + 795 + 705? (a) 1800 (b) 2000 (c) 1700 (d) 1900
  28. 28.Which is closest to 2709 ÷ 31? (a) 45 (b) 900 (c) 180 (d) 90
  29. 29.Which is closest to 1206 ÷ 19? (a) 120 (b) 60 (c) 600 (d) 30
  30. 30.Which is closest to 105 + 498 + 595? (a) 1300 (b) 1400 (c) 1200 (d) 1100
  31. 31.Which is closest to 298 × 38? (Round each number first.) (a) 12000 (b) 24000 (c) 120000 (d) 1200
  32. 32.Which is closest to 2997 ÷ 51? (a) 60 (b) 30 (c) 600 (d) 120
  33. 33.Which is closest to 3006 ÷ 51? (a) 30 (b) 120 (c) 600 (d) 60
  34. 34.Round 76.76 to one decimal place. =
  35. 35.Which is closest to 397 × 91? (Round each number first.) (a) 3600 (b) 360000 (c) 72000 (d) 36000
  36. 36.Which is closest to 602 × 20? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  37. 37.Round 36.93 to one decimal place. =
  38. 38.Which is closest to 203 + 103 + 796? (a) 1200 (b) 1000 (c) 1100 (d) 1300
  39. 39.Round 20.17 to one decimal place. =
  40. 40.Which is closest to 3992 ÷ 51? (a) 80 (b) 40 (c) 160 (d) 800

Answer key

  1. 20.5
  2. 17700
  3. 50
  4. 27000
  5. 13300
  6. 30
  7. 70
  8. 90
  9. 42000
  10. 30
  11. 1100
  12. 12000
  13. 1200
  14. 65.3
  15. 1800
  16. 28000
  17. 87.7
  18. 24000
  19. 43.2
  20. 2300
  21. 1700
  22. 79.6
  23. 8000
  24. 98.1
  25. 30
  26. 23000
  27. 1800
  28. 90
  29. 60
  30. 1200
  31. 12000
  32. 60
  33. 60
  34. 76.8
  35. 36000
  36. 12000
  37. 36.9
  38. 1100
  39. 20.2
  40. 80

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