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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 551 · 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 301 + 698 + 96? (a) 1300 (b) 1100 (c) 1200 (d) 1000
  2. 2.Round 51.37 to one decimal place. =
  3. 3.Round 21610 to the nearest hundred.
  4. 4.Which is closest to 3506 ÷ 51? (a) 700 (b) 140 (c) 35 (d) 70
  5. 5.Round 94874 to the nearest thousand.
  6. 6.Which is closest to 2801 ÷ 41? (a) 140 (b) 70 (c) 35 (d) 700
  7. 7.Which is closest to 399 × 69? (Round each number first.) (a) 56000 (b) 2800 (c) 28000 (d) 280000
  8. 8.Round 63035 to the nearest thousand.
  9. 9.Which is closest to 597 + 399 + 297? (a) 1200 (b) 1500 (c) 1300 (d) 1400
  10. 10.Which is closest to 799 × 58? (Round each number first.) (a) 4800 (b) 48000 (c) 480000 (d) 96000
  11. 11.Round 58.62 to one decimal place. =
  12. 12.Round 72.92 to one decimal place. =
  13. 13.Round 31588 to the nearest thousand.
  14. 14.Which is closest to 2509 ÷ 51? (a) 50 (b) 100 (c) 25 (d) 500
  15. 15.Which is closest to 903 + 198 + 600? (a) 1800 (b) 1900 (c) 1700 (d) 1600
  16. 16.Which is closest to 1498 ÷ 29? (a) 25 (b) 100 (c) 500 (d) 50
  17. 17.Round 68836 to the nearest hundred.
  18. 18.Round 84.47 to one decimal place. =
  19. 19.Round 70.73 to one decimal place. =
  20. 20.Which is closest to 697 + 501 + 296? (a) 1400 (b) 1600 (c) 1700 (d) 1500
  21. 21.Round 18.82 to one decimal place. =
  22. 22.Which is closest to 4009 ÷ 49? (a) 80 (b) 160 (c) 40 (d) 800
  23. 23.Which is closest to 504 × 18? (Round each number first.) (a) 1000 (b) 10000 (c) 20000 (d) 100000
  24. 24.Which is closest to 2498 ÷ 49? (a) 100 (b) 25 (c) 50 (d) 500
  25. 25.Which is closest to 602 ÷ 31? (a) 40 (b) 200 (c) 10 (d) 20
  26. 26.Which is closest to 4498 ÷ 51? (a) 45 (b) 90 (c) 180 (d) 900
  27. 27.Which is closest to 401 × 30? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  28. 28.Round 49.21 to one decimal place. =
  29. 29.Which is closest to 398 × 82? (Round each number first.) (a) 3200 (b) 32000 (c) 320000 (d) 64000
  30. 30.Round 51094 to the nearest hundred.
  31. 31.Round 6667 to the nearest thousand.
  32. 32.Round 92.81 to one decimal place. =
  33. 33.Which is closest to 200 + 97 + 203? (a) 700 (b) 600 (c) 500 (d) 400
  34. 34.Round 12.48 to one decimal place. =
  35. 35.Round 56393 to the nearest thousand.
  36. 36.Round 44.54 to one decimal place. =
  37. 37.Which is closest to 300 × 32? (Round each number first.) (a) 900 (b) 18000 (c) 9000 (d) 90000
  38. 38.Which is closest to 503 × 71? (Round each number first.) (a) 70000 (b) 35000 (c) 3500 (d) 350000
  39. 39.Which is closest to 696 × 52? (Round each number first.) (a) 3500 (b) 35000 (c) 70000 (d) 350000
  40. 40.Which is closest to 204 × 28? (Round each number first.) (a) 600 (b) 60000 (c) 6000 (d) 12000

Answer key

  1. 1100
  2. 51.4
  3. 21600
  4. 70
  5. 95000
  6. 70
  7. 28000
  8. 63000
  9. 1300
  10. 48000
  11. 58.6
  12. 72.9
  13. 32000
  14. 50
  15. 1700
  16. 50
  17. 68800
  18. 84.5
  19. 70.7
  20. 1500
  21. 18.8
  22. 80
  23. 10000
  24. 50
  25. 20
  26. 90
  27. 12000
  28. 49.2
  29. 32000
  30. 51100
  31. 7000
  32. 92.8
  33. 500
  34. 12.5
  35. 56000
  36. 44.5
  37. 9000
  38. 35000
  39. 35000
  40. 6000

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