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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 760 · 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 498 × 68? (Round each number first.) (a) 35000 (b) 350000 (c) 3500 (d) 70000
  2. 2.Which is closest to 601 + 896 + 195? (a) 1600 (b) 1700 (c) 1900 (d) 1800
  3. 3.Which is closest to 604 × 21? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  4. 4.Which is closest to 97 + 401 + 495? (a) 1100 (b) 900 (c) 1200 (d) 1000
  5. 5.Round 58.09 to one decimal place. =
  6. 6.Which is closest to 297 × 79? (Round each number first.) (a) 24000 (b) 48000 (c) 2400 (d) 240000
  7. 7.Which is closest to 596 × 80? (Round each number first.) (a) 48000 (b) 4800 (c) 96000 (d) 480000
  8. 8.Which is closest to 895 + 398 + 101? (a) 1400 (b) 1300 (c) 1600 (d) 1500
  9. 9.Which is closest to 1995 ÷ 51? (a) 20 (b) 80 (c) 40 (d) 400
  10. 10.Which is closest to 1391 ÷ 19? (a) 70 (b) 35 (c) 140 (d) 700
  11. 11.Which is closest to 802 × 52? (Round each number first.) (a) 4000 (b) 40000 (c) 400000 (d) 80000
  12. 12.Round 89573 to the nearest hundred.
  13. 13.Round 86258 to the nearest hundred.
  14. 14.Round 83.18 to one decimal place. =
  15. 15.Which is closest to 698 × 60? (Round each number first.) (a) 42000 (b) 4200 (c) 420000 (d) 84000
  16. 16.Round 61.41 to one decimal place. =
  17. 17.Which is closest to 599 + 398 + 596? (a) 1500 (b) 1600 (c) 1700 (d) 1800
  18. 18.Which is closest to 305 + 595 + 196? (a) 1200 (b) 1000 (c) 1300 (d) 1100
  19. 19.Which is closest to 404 + 496 + 302? (a) 1300 (b) 1200 (c) 1400 (d) 1100
  20. 20.Round 49.83 to one decimal place. =
  21. 21.Round 75.59 to one decimal place. =
  22. 22.Round 89349 to the nearest ten.
  23. 23.Which is closest to 804 ÷ 39? (a) 200 (b) 20 (c) 10 (d) 40
  24. 24.Which is closest to 2704 ÷ 31? (a) 45 (b) 900 (c) 180 (d) 90
  25. 25.Which is closest to 1196 ÷ 39? (a) 300 (b) 60 (c) 15 (d) 30
  26. 26.Which is closest to 1191 ÷ 29? (a) 80 (b) 400 (c) 20 (d) 40
  27. 27.Round 92003 to the nearest ten.
  28. 28.Which is closest to 196 + 601 + 301? (a) 1200 (b) 1100 (c) 1300 (d) 1000
  29. 29.Round 55.76 to one decimal place. =
  30. 30.Which is closest to 1407 ÷ 19? (a) 35 (b) 140 (c) 700 (d) 70
  31. 31.Which is closest to 202 + 200 + 896? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  32. 32.Round 25777 to the nearest thousand.
  33. 33.Round 34294 to the nearest thousand.
  34. 34.Round 77.27 to one decimal place. =
  35. 35.Round 92.53 to one decimal place. =
  36. 36.Which is closest to 304 × 89? (Round each number first.) (a) 2700 (b) 27000 (c) 270000 (d) 54000
  37. 37.Which is closest to 397 + 402 + 496? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  38. 38.Which is closest to 696 + 298 + 302? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  39. 39.Which is closest to 1795 ÷ 29? (a) 120 (b) 60 (c) 30 (d) 600
  40. 40.Which is closest to 598 × 18? (Round each number first.) (a) 24000 (b) 120000 (c) 1200 (d) 12000

Answer key

  1. 35000
  2. 1700
  3. 12000
  4. 1000
  5. 58.1
  6. 24000
  7. 48000
  8. 1400
  9. 40
  10. 70
  11. 40000
  12. 89600
  13. 86300
  14. 83.2
  15. 42000
  16. 61.4
  17. 1600
  18. 1100
  19. 1200
  20. 49.8
  21. 75.6
  22. 89350
  23. 20
  24. 90
  25. 30
  26. 40
  27. 92000
  28. 1100
  29. 55.8
  30. 70
  31. 1300
  32. 26000
  33. 34000
  34. 77.3
  35. 92.5
  36. 27000
  37. 1300
  38. 1300
  39. 60
  40. 12000

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