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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 736 · 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 30.29 to one decimal place. =
  2. 2.Round 29744 to the nearest thousand.
  3. 3.Round 20.62 to one decimal place. =
  4. 4.Round 79.47 to one decimal place. =
  5. 5.Which is closest to 1197 ÷ 21? (a) 120 (b) 30 (c) 600 (d) 60
  6. 6.Which is closest to 399 + 698 + 497? (a) 1600 (b) 1500 (c) 1800 (d) 1700
  7. 7.Round 18539 to the nearest hundred.
  8. 8.Which is closest to 3592 ÷ 41? (a) 45 (b) 90 (c) 180 (d) 900
  9. 9.Round 58.83 to one decimal place. =
  10. 10.Which is closest to 702 + 596 + 600? (a) 1900 (b) 1800 (c) 2000 (d) 2100
  11. 11.Round 85767 to the nearest hundred.
  12. 12.Which is closest to 403 × 69? (Round each number first.) (a) 56000 (b) 2800 (c) 280000 (d) 28000
  13. 13.Round 41.44 to one decimal place. =
  14. 14.Round 96.08 to one decimal place. =
  15. 15.Round 85.77 to one decimal place. =
  16. 16.Round 40.66 to one decimal place. =
  17. 17.Round 20.82 to one decimal place. =
  18. 18.Round 65615 to the nearest hundred.
  19. 19.Which is closest to 499 × 69? (Round each number first.) (a) 35000 (b) 70000 (c) 350000 (d) 3500
  20. 20.Round 55233 to the nearest thousand.
  21. 21.Which is closest to 1609 ÷ 39? (a) 400 (b) 20 (c) 40 (d) 80
  22. 22.Round 3755 to the nearest thousand.
  23. 23.Which is closest to 798 × 58? (Round each number first.) (a) 4800 (b) 480000 (c) 48000 (d) 96000
  24. 24.Round 24.39 to one decimal place. =
  25. 25.Which is closest to 299 × 32? (Round each number first.) (a) 900 (b) 9000 (c) 90000 (d) 18000
  26. 26.Which is closest to 501 × 40? (Round each number first.) (a) 200000 (b) 40000 (c) 20000 (d) 2000
  27. 27.Which is closest to 1996 ÷ 39? (a) 50 (b) 25 (c) 100 (d) 500
  28. 28.Which is closest to 800 + 697 + 405? (a) 2000 (b) 1900 (c) 1800 (d) 2100
  29. 29.Which is closest to 601 ÷ 29? (a) 10 (b) 200 (c) 40 (d) 20
  30. 30.Round 7537 to the nearest ten.
  31. 31.Which is closest to 697 × 51? (Round each number first.) (a) 35000 (b) 3500 (c) 70000 (d) 350000
  32. 32.Which is closest to 1794 ÷ 29? (a) 120 (b) 60 (c) 600 (d) 30
  33. 33.Round 19.49 to one decimal place. =
  34. 34.Which is closest to 299 × 51? (Round each number first.) (a) 1500 (b) 15000 (c) 30000 (d) 150000
  35. 35.Which is closest to 199 × 69? (Round each number first.) (a) 14000 (b) 140000 (c) 1400 (d) 28000
  36. 36.Which is closest to 702 + 204 + 495? (a) 1600 (b) 1400 (c) 1500 (d) 1300
  37. 37.Which is closest to 396 + 196 + 204? (a) 700 (b) 1000 (c) 900 (d) 800
  38. 38.Round 8397 to the nearest ten.
  39. 39.Round 95.94 to one decimal place. =
  40. 40.Round 25356 to the nearest ten.

Answer key

  1. 30.3
  2. 30000
  3. 20.6
  4. 79.5
  5. 60
  6. 1600
  7. 18500
  8. 90
  9. 58.8
  10. 1900
  11. 85800
  12. 28000
  13. 41.4
  14. 96.1
  15. 85.8
  16. 40.7
  17. 20.8
  18. 65600
  19. 35000
  20. 55000
  21. 40
  22. 4000
  23. 48000
  24. 24.4
  25. 9000
  26. 20000
  27. 50
  28. 1900
  29. 20
  30. 7540
  31. 35000
  32. 60
  33. 19.5
  34. 15000
  35. 14000
  36. 1400
  37. 800
  38. 8400
  39. 95.9
  40. 25360

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