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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 155 · 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 196 × 79? (Round each number first.) (a) 16000 (b) 1600 (c) 160000 (d) 32000
  2. 2.Which is closest to 303 + 198 + 103? (a) 700 (b) 500 (c) 600 (d) 800
  3. 3.Which is closest to 1498 ÷ 51? (a) 15 (b) 30 (c) 60 (d) 300
  4. 4.Round 85207 to the nearest thousand.
  5. 5.Which is closest to 203 + 804 + 595? (a) 1600 (b) 1500 (c) 1700 (d) 1800
  6. 6.Which is closest to 395 + 200 + 705? (a) 1500 (b) 1200 (c) 1400 (d) 1300
  7. 7.Which is closest to 201 × 60? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200
  8. 8.Which is closest to 607 ÷ 29? (a) 200 (b) 10 (c) 20 (d) 40
  9. 9.Round 58897 to the nearest hundred.
  10. 10.Which is closest to 3593 ÷ 41? (a) 90 (b) 180 (c) 45 (d) 900
  11. 11.Which is closest to 994 ÷ 49? (a) 40 (b) 200 (c) 10 (d) 20
  12. 12.Which is closest to 791 ÷ 21? (a) 80 (b) 40 (c) 20 (d) 400
  13. 13.Which is closest to 497 × 92? (Round each number first.) (a) 450000 (b) 90000 (c) 45000 (d) 4500
  14. 14.Which is closest to 3507 ÷ 51? (a) 700 (b) 70 (c) 140 (d) 35
  15. 15.Round 43.61 to one decimal place. =
  16. 16.Which is closest to 198 × 81? (Round each number first.) (a) 1600 (b) 160000 (c) 32000 (d) 16000
  17. 17.Which is closest to 100 + 396 + 399? (a) 900 (b) 1000 (c) 1100 (d) 800
  18. 18.Which is closest to 605 + 297 + 700? (a) 1600 (b) 1700 (c) 1500 (d) 1800
  19. 19.Which is closest to 702 + 495 + 604? (a) 2000 (b) 1700 (c) 1800 (d) 1900
  20. 20.Which is closest to 401 + 697 + 497? (a) 1600 (b) 1700 (c) 1500 (d) 1800
  21. 21.Round 30.64 to one decimal place. =
  22. 22.Which is closest to 703 × 48? (Round each number first.) (a) 350000 (b) 70000 (c) 35000 (d) 3500
  23. 23.Round 15.07 to one decimal place. =
  24. 24.Which is closest to 991 ÷ 21? (a) 500 (b) 25 (c) 50 (d) 100
  25. 25.Round 29907 to the nearest ten.
  26. 26.Round 65.87 to one decimal place. =
  27. 27.Which is closest to 801 × 20? (Round each number first.) (a) 160000 (b) 16000 (c) 1600 (d) 32000
  28. 28.Round 72.67 to one decimal place. =
  29. 29.Round 33135 to the nearest thousand.
  30. 30.Which is closest to 804 × 19? (Round each number first.) (a) 32000 (b) 1600 (c) 160000 (d) 16000
  31. 31.Which is closest to 794 ÷ 21? (a) 40 (b) 20 (c) 80 (d) 400
  32. 32.Which is closest to 104 + 502 + 496? (a) 1300 (b) 1000 (c) 1200 (d) 1100
  33. 33.Round 21856 to the nearest ten.
  34. 34.Which is closest to 201 × 59? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  35. 35.Which is closest to 404 × 68? (Round each number first.) (a) 56000 (b) 28000 (c) 2800 (d) 280000
  36. 36.Round 74.53 to one decimal place. =
  37. 37.Which is closest to 597 × 72? (Round each number first.) (a) 42000 (b) 84000 (c) 4200 (d) 420000
  38. 38.Which is closest to 400 ÷ 19? (a) 20 (b) 200 (c) 40 (d) 10
  39. 39.Which is closest to 3203 ÷ 39? (a) 160 (b) 80 (c) 40 (d) 800
  40. 40.Which is closest to 1497 ÷ 49? (a) 300 (b) 60 (c) 30 (d) 15

Answer key

  1. 16000
  2. 600
  3. 30
  4. 85000
  5. 1600
  6. 1300
  7. 12000
  8. 20
  9. 58900
  10. 90
  11. 20
  12. 40
  13. 45000
  14. 70
  15. 43.6
  16. 16000
  17. 900
  18. 1600
  19. 1800
  20. 1600
  21. 30.6
  22. 35000
  23. 15.1
  24. 50
  25. 29910
  26. 65.9
  27. 16000
  28. 72.7
  29. 33000
  30. 16000
  31. 40
  32. 1100
  33. 21860
  34. 12000
  35. 28000
  36. 74.5
  37. 42000
  38. 20
  39. 80
  40. 30

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