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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 409 · 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 27638 to the nearest thousand.
  2. 2.Which is closest to 2997 ÷ 49? (a) 30 (b) 60 (c) 120 (d) 600
  3. 3.Which is closest to 903 × 82? (Round each number first.) (a) 72000 (b) 7200 (c) 720000 (d) 144000
  4. 4.Which is closest to 805 + 599 + 401? (a) 2000 (b) 1900 (c) 1700 (d) 1800
  5. 5.Which is closest to 1606 ÷ 21? (a) 800 (b) 160 (c) 80 (d) 40
  6. 6.Which is closest to 3501 ÷ 51? (a) 35 (b) 70 (c) 140 (d) 700
  7. 7.Round 87.59 to one decimal place. =
  8. 8.Which is closest to 897 × 48? (Round each number first.) (a) 4500 (b) 45000 (c) 90000 (d) 450000
  9. 9.Which is closest to 593 ÷ 29? (a) 10 (b) 40 (c) 200 (d) 20
  10. 10.Which is closest to 496 × 68? (Round each number first.) (a) 35000 (b) 70000 (c) 3500 (d) 350000
  11. 11.Round 40.67 to one decimal place. =
  12. 12.Round 50547 to the nearest thousand.
  13. 13.Which is closest to 398 × 92? (Round each number first.) (a) 360000 (b) 36000 (c) 72000 (d) 3600
  14. 14.Which is closest to 597 × 29? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
  15. 15.Which is closest to 401 × 80? (Round each number first.) (a) 64000 (b) 320000 (c) 32000 (d) 3200
  16. 16.Round 29705 to the nearest thousand.
  17. 17.Which is closest to 804 ÷ 39? (a) 200 (b) 10 (c) 40 (d) 20
  18. 18.Round 56186 to the nearest thousand.
  19. 19.Round 85.68 to one decimal place. =
  20. 20.Which is closest to 498 + 595 + 105? (a) 1100 (b) 1300 (c) 1200 (d) 1400
  21. 21.Which is closest to 2705 ÷ 31? (a) 45 (b) 900 (c) 90 (d) 180
  22. 22.Which is closest to 391 ÷ 21? (a) 10 (b) 20 (c) 200 (d) 40
  23. 23.Round 84567 to the nearest thousand.
  24. 24.Which is closest to 799 + 798 + 96? (a) 1900 (b) 1600 (c) 1800 (d) 1700
  25. 25.Which is closest to 1798 ÷ 31? (a) 120 (b) 60 (c) 600 (d) 30
  26. 26.Which is closest to 592 ÷ 31? (a) 200 (b) 40 (c) 10 (d) 20
  27. 27.Which is closest to 1405 ÷ 19? (a) 35 (b) 140 (c) 70 (d) 700
  28. 28.Which is closest to 500 × 59? (Round each number first.) (a) 3000 (b) 300000 (c) 30000 (d) 60000
  29. 29.Round 90043 to the nearest ten.
  30. 30.Which is closest to 1196 ÷ 29? (a) 400 (b) 20 (c) 80 (d) 40
  31. 31.Round 94903 to the nearest thousand.
  32. 32.Which is closest to 703 + 300 + 301? (a) 1400 (b) 1500 (c) 1200 (d) 1300
  33. 33.Which is closest to 599 × 48? (Round each number first.) (a) 30000 (b) 300000 (c) 60000 (d) 3000
  34. 34.Which is closest to 596 × 70? (Round each number first.) (a) 84000 (b) 420000 (c) 4200 (d) 42000
  35. 35.Which is closest to 903 × 30? (Round each number first.) (a) 54000 (b) 2700 (c) 27000 (d) 270000
  36. 36.Which is closest to 1607 ÷ 41? (a) 400 (b) 40 (c) 80 (d) 20
  37. 37.Round 49225 to the nearest thousand.
  38. 38.Which is closest to 301 × 58? (Round each number first.) (a) 1800 (b) 18000 (c) 36000 (d) 180000
  39. 39.Which is closest to 303 × 48? (Round each number first.) (a) 1500 (b) 15000 (c) 30000 (d) 150000
  40. 40.Which is closest to 205 + 305 + 597? (a) 1300 (b) 1200 (c) 1000 (d) 1100

Answer key

  1. 28000
  2. 60
  3. 72000
  4. 1800
  5. 80
  6. 70
  7. 87.6
  8. 45000
  9. 20
  10. 35000
  11. 40.7
  12. 51000
  13. 36000
  14. 18000
  15. 32000
  16. 30000
  17. 20
  18. 56000
  19. 85.7
  20. 1200
  21. 90
  22. 20
  23. 85000
  24. 1700
  25. 60
  26. 20
  27. 70
  28. 30000
  29. 90040
  30. 40
  31. 95000
  32. 1300
  33. 30000
  34. 42000
  35. 27000
  36. 40
  37. 49000
  38. 18000
  39. 15000
  40. 1100

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