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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 679 · 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 598 + 796 + 600? (a) 2000 (b) 1900 (c) 2100 (d) 2200
  2. 2.Which is closest to 1798 ÷ 31? (a) 60 (b) 120 (c) 30 (d) 600
  3. 3.Round 27.33 to one decimal place. =
  4. 4.Round 74.11 to one decimal place. =
  5. 5.Which is closest to 1000 ÷ 51? (a) 200 (b) 20 (c) 40 (d) 10
  6. 6.Round 74796 to the nearest thousand.
  7. 7.Round 94504 to the nearest hundred.
  8. 8.Which is closest to 505 + 296 + 198? (a) 1200 (b) 1000 (c) 900 (d) 1100
  9. 9.Which is closest to 198 × 90? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
  10. 10.Round 37.68 to one decimal place. =
  11. 11.Round 81.94 to one decimal place. =
  12. 12.Which is closest to 505 + 199 + 595? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  13. 13.Round 30.28 to one decimal place. =
  14. 14.Which is closest to 105 + 505 + 795? (a) 1600 (b) 1400 (c) 1500 (d) 1300
  15. 15.Which is closest to 3499 ÷ 49? (a) 140 (b) 700 (c) 35 (d) 70
  16. 16.Round 15.71 to one decimal place. =
  17. 17.Which is closest to 697 × 49? (Round each number first.) (a) 70000 (b) 350000 (c) 3500 (d) 35000
  18. 18.Which is closest to 595 + 98 + 104? (a) 800 (b) 700 (c) 900 (d) 1000
  19. 19.Round 98.12 to one decimal place. =
  20. 20.Round 21524 to the nearest ten.
  21. 21.Which is closest to 1796 ÷ 31? (a) 600 (b) 30 (c) 60 (d) 120
  22. 22.Round 59971 to the nearest ten.
  23. 23.Which is closest to 204 × 89? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  24. 24.Round 68.76 to one decimal place. =
  25. 25.Which is closest to 698 + 403 + 101? (a) 1400 (b) 1200 (c) 1100 (d) 1300
  26. 26.Round 46.34 to one decimal place. =
  27. 27.Which is closest to 204 + 903 + 97? (a) 1300 (b) 1400 (c) 1200 (d) 1100
  28. 28.Round 51495 to the nearest thousand.
  29. 29.Which is closest to 698 × 19? (Round each number first.) (a) 1400 (b) 14000 (c) 140000 (d) 28000
  30. 30.Round 68.74 to one decimal place. =
  31. 31.Round 87.34 to one decimal place. =
  32. 32.Which is closest to 496 × 30? (Round each number first.) (a) 30000 (b) 1500 (c) 150000 (d) 15000
  33. 33.Round 81.43 to one decimal place. =
  34. 34.Round 10633 to the nearest ten.
  35. 35.Which is closest to 195 + 202 + 96? (a) 600 (b) 700 (c) 400 (d) 500
  36. 36.Which is closest to 704 + 596 + 405? (a) 1700 (b) 1900 (c) 1600 (d) 1800
  37. 37.Which is closest to 496 × 81? (Round each number first.) (a) 4000 (b) 80000 (c) 40000 (d) 400000
  38. 38.Which is closest to 1404 ÷ 19? (a) 35 (b) 140 (c) 70 (d) 700
  39. 39.Which is closest to 3491 ÷ 49? (a) 140 (b) 35 (c) 700 (d) 70
  40. 40.Which is closest to 296 × 29? (Round each number first.) (a) 18000 (b) 900 (c) 9000 (d) 90000

Answer key

  1. 2000
  2. 60
  3. 27.3
  4. 74.1
  5. 20
  6. 75000
  7. 94500
  8. 1000
  9. 18000
  10. 37.7
  11. 81.9
  12. 1300
  13. 30.3
  14. 1400
  15. 70
  16. 15.7
  17. 35000
  18. 800
  19. 98.1
  20. 21520
  21. 60
  22. 59970
  23. 18000
  24. 68.8
  25. 1200
  26. 46.3
  27. 1200
  28. 51000
  29. 14000
  30. 68.7
  31. 87.3
  32. 15000
  33. 81.4
  34. 10630
  35. 500
  36. 1700
  37. 40000
  38. 70
  39. 70
  40. 9000

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