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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 396 · 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 605 + 205 + 795? (a) 1800 (b) 1500 (c) 1600 (d) 1700
  2. 2.Which is closest to 700 × 69? (Round each number first.) (a) 490000 (b) 98000 (c) 4900 (d) 49000
  3. 3.Which is closest to 301 + 495 + 901? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  4. 4.Round 97.83 to one decimal place. =
  5. 5.Which is closest to 304 + 399 + 595? (a) 1500 (b) 1300 (c) 1400 (d) 1200
  6. 6.Which is closest to 1593 ÷ 39? (a) 20 (b) 400 (c) 80 (d) 40
  7. 7.Round 17855 to the nearest hundred.
  8. 8.Which is closest to 1203 ÷ 39? (a) 15 (b) 300 (c) 30 (d) 60
  9. 9.Which is closest to 696 × 58? (Round each number first.) (a) 420000 (b) 4200 (c) 84000 (d) 42000
  10. 10.Round 5558 to the nearest ten.
  11. 11.Which is closest to 597 × 49? (Round each number first.) (a) 60000 (b) 3000 (c) 30000 (d) 300000
  12. 12.Which is closest to 904 + 698 + 196? (a) 1700 (b) 2000 (c) 1800 (d) 1900
  13. 13.Round 87923 to the nearest ten.
  14. 14.Round 76.32 to one decimal place. =
  15. 15.Which is closest to 497 × 70? (Round each number first.) (a) 3500 (b) 35000 (c) 70000 (d) 350000
  16. 16.Which is closest to 2996 ÷ 51? (a) 120 (b) 30 (c) 60 (d) 600
  17. 17.Round 26.23 to one decimal place. =
  18. 18.Round 51672 to the nearest hundred.
  19. 19.Round 79611 to the nearest ten.
  20. 20.Which is closest to 897 × 21? (Round each number first.) (a) 18000 (b) 1800 (c) 180000 (d) 36000
  21. 21.Which is closest to 995 ÷ 19? (a) 100 (b) 50 (c) 500 (d) 25
  22. 22.Which is closest to 903 × 62? (Round each number first.) (a) 54000 (b) 108000 (c) 540000 (d) 5400
  23. 23.Round 61.58 to one decimal place. =
  24. 24.Round 95.69 to one decimal place. =
  25. 25.Which is closest to 396 × 19? (Round each number first.) (a) 16000 (b) 8000 (c) 800 (d) 80000
  26. 26.Which is closest to 198 × 51? (Round each number first.) (a) 20000 (b) 100000 (c) 1000 (d) 10000
  27. 27.Which is closest to 1807 ÷ 21? (a) 90 (b) 900 (c) 45 (d) 180
  28. 28.Round 67564 to the nearest hundred.
  29. 29.Which is closest to 3498 ÷ 49? (a) 35 (b) 70 (c) 700 (d) 140
  30. 30.Which is closest to 501 × 22? (Round each number first.) (a) 1000 (b) 100000 (c) 10000 (d) 20000
  31. 31.Round 54.12 to one decimal place. =
  32. 32.Round 24.42 to one decimal place. =
  33. 33.Which is closest to 798 ÷ 21? (a) 20 (b) 400 (c) 80 (d) 40
  34. 34.Which is closest to 1509 ÷ 31? (a) 500 (b) 50 (c) 100 (d) 25
  35. 35.Which is closest to 198 × 60? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  36. 36.Round 64.29 to one decimal place. =
  37. 37.Which is closest to 900 + 603 + 99? (a) 1700 (b) 1800 (c) 1600 (d) 1500
  38. 38.Which is closest to 495 + 904 + 200? (a) 1800 (b) 1600 (c) 1500 (d) 1700
  39. 39.Round 44.26 to one decimal place. =
  40. 40.Which is closest to 101 + 700 + 99? (a) 900 (b) 1100 (c) 800 (d) 1000

Answer key

  1. 1600
  2. 49000
  3. 1700
  4. 97.8
  5. 1300
  6. 40
  7. 17900
  8. 30
  9. 42000
  10. 5560
  11. 30000
  12. 1800
  13. 87920
  14. 76.3
  15. 35000
  16. 60
  17. 26.2
  18. 51700
  19. 79610
  20. 18000
  21. 50
  22. 54000
  23. 61.6
  24. 95.7
  25. 8000
  26. 10000
  27. 90
  28. 67600
  29. 70
  30. 10000
  31. 54.1
  32. 24.4
  33. 40
  34. 50
  35. 12000
  36. 64.3
  37. 1600
  38. 1600
  39. 44.3
  40. 900

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