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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 797 · 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 998 ÷ 19? (a) 50 (b) 100 (c) 500 (d) 25
  2. 2.Which is closest to 404 × 81? (Round each number first.) (a) 320000 (b) 3200 (c) 64000 (d) 32000
  3. 3.Which is closest to 997 ÷ 21? (a) 500 (b) 100 (c) 25 (d) 50
  4. 4.Which is closest to 3503 ÷ 51? (a) 700 (b) 70 (c) 140 (d) 35
  5. 5.Round 79331 to the nearest thousand.
  6. 6.Which is closest to 804 + 795 + 304? (a) 2100 (b) 1800 (c) 1900 (d) 2000
  7. 7.Round 61.61 to one decimal place. =
  8. 8.Round 88.28 to one decimal place. =
  9. 9.Round 88.07 to one decimal place. =
  10. 10.Round 17.81 to one decimal place. =
  11. 11.Which is closest to 1492 ÷ 31? (a) 25 (b) 500 (c) 50 (d) 100
  12. 12.Round 58693 to the nearest thousand.
  13. 13.Which is closest to 497 × 41? (Round each number first.) (a) 200000 (b) 40000 (c) 2000 (d) 20000
  14. 14.Which is closest to 200 × 29? (Round each number first.) (a) 600 (b) 6000 (c) 12000 (d) 60000
  15. 15.Round 3958 to the nearest hundred.
  16. 16.Round 41344 to the nearest hundred.
  17. 17.Which is closest to 900 × 68? (Round each number first.) (a) 63000 (b) 126000 (c) 6300 (d) 630000
  18. 18.Round 31.58 to one decimal place. =
  19. 19.Which is closest to 598 + 495 + 399? (a) 1500 (b) 1400 (c) 1600 (d) 1700
  20. 20.Which is closest to 196 × 18? (Round each number first.) (a) 4000 (b) 40000 (c) 400 (d) 8000
  21. 21.Round 27969 to the nearest hundred.
  22. 22.Which is closest to 4501 ÷ 51? (a) 45 (b) 900 (c) 90 (d) 180
  23. 23.Which is closest to 901 + 96 + 504? (a) 1500 (b) 1700 (c) 1400 (d) 1600
  24. 24.Round 27822 to the nearest thousand.
  25. 25.Round 63718 to the nearest ten.
  26. 26.Round 81.91 to one decimal place. =
  27. 27.Which is closest to 601 + 204 + 205? (a) 1100 (b) 1000 (c) 900 (d) 1200
  28. 28.Round 88.43 to one decimal place. =
  29. 29.Which is closest to 1503 ÷ 51? (a) 30 (b) 15 (c) 60 (d) 300
  30. 30.Round 58.66 to one decimal place. =
  31. 31.Round 35.39 to one decimal place. =
  32. 32.Which is closest to 703 × 60? (Round each number first.) (a) 4200 (b) 420000 (c) 42000 (d) 84000
  33. 33.Which is closest to 299 × 49? (Round each number first.) (a) 150000 (b) 15000 (c) 30000 (d) 1500
  34. 34.Which is closest to 3008 ÷ 49? (a) 120 (b) 30 (c) 600 (d) 60
  35. 35.Round 85.54 to one decimal place. =
  36. 36.Which is closest to 4508 ÷ 51? (a) 900 (b) 180 (c) 90 (d) 45
  37. 37.Round 91121 to the nearest hundred.
  38. 38.Round 1681 to the nearest thousand.
  39. 39.Which is closest to 596 + 405 + 702? (a) 1900 (b) 1800 (c) 1600 (d) 1700
  40. 40.Which is closest to 604 × 62? (Round each number first.) (a) 360000 (b) 72000 (c) 36000 (d) 3600

Answer key

  1. 50
  2. 32000
  3. 50
  4. 70
  5. 79000
  6. 1900
  7. 61.6
  8. 88.3
  9. 88.1
  10. 17.8
  11. 50
  12. 59000
  13. 20000
  14. 6000
  15. 4000
  16. 41300
  17. 63000
  18. 31.6
  19. 1500
  20. 4000
  21. 28000
  22. 90
  23. 1500
  24. 28000
  25. 63720
  26. 81.9
  27. 1000
  28. 88.4
  29. 30
  30. 58.7
  31. 35.4
  32. 42000
  33. 15000
  34. 60
  35. 85.5
  36. 90
  37. 91100
  38. 2000
  39. 1700
  40. 36000

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