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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 331 · 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 896 × 81? (Round each number first.) (a) 720000 (b) 7200 (c) 144000 (d) 72000
  2. 2.Round 26.64 to one decimal place. =
  3. 3.Which is closest to 1202 ÷ 29? (a) 400 (b) 80 (c) 20 (d) 40
  4. 4.Which is closest to 98 + 695 + 301? (a) 1100 (b) 1200 (c) 1300 (d) 1000
  5. 5.Round 92.52 to one decimal place. =
  6. 6.Which is closest to 1496 ÷ 29? (a) 500 (b) 100 (c) 50 (d) 25
  7. 7.Round 55059 to the nearest hundred.
  8. 8.Which is closest to 1796 ÷ 29? (a) 60 (b) 600 (c) 120 (d) 30
  9. 9.Round 8730 to the nearest hundred.
  10. 10.Round 30.69 to one decimal place. =
  11. 11.Which is closest to 1499 ÷ 51? (a) 30 (b) 60 (c) 15 (d) 300
  12. 12.Which is closest to 604 × 38? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  13. 13.Which is closest to 598 × 81? (Round each number first.) (a) 4800 (b) 96000 (c) 48000 (d) 480000
  14. 14.Which is closest to 896 × 59? (Round each number first.) (a) 108000 (b) 540000 (c) 5400 (d) 54000
  15. 15.Which is closest to 996 ÷ 19? (a) 25 (b) 500 (c) 100 (d) 50
  16. 16.Which is closest to 400 + 104 + 595? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  17. 17.Which is closest to 1603 ÷ 21? (a) 160 (b) 80 (c) 800 (d) 40
  18. 18.Which is closest to 1204 ÷ 39? (a) 60 (b) 300 (c) 30 (d) 15
  19. 19.Which is closest to 402 × 28? (Round each number first.) (a) 1200 (b) 24000 (c) 120000 (d) 12000
  20. 20.Which is closest to 796 × 32? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  21. 21.Which is closest to 701 + 298 + 697? (a) 1900 (b) 1600 (c) 1800 (d) 1700
  22. 22.Which is closest to 399 × 68? (Round each number first.) (a) 28000 (b) 56000 (c) 2800 (d) 280000
  23. 23.Which is closest to 296 × 28? (Round each number first.) (a) 18000 (b) 9000 (c) 900 (d) 90000
  24. 24.Which is closest to 1191 ÷ 39? (a) 15 (b) 300 (c) 60 (d) 30
  25. 25.Round 68706 to the nearest hundred.
  26. 26.Round 24755 to the nearest hundred.
  27. 27.Round 25.39 to one decimal place. =
  28. 28.Round 55116 to the nearest thousand.
  29. 29.Which is closest to 797 × 61? (Round each number first.) (a) 4800 (b) 480000 (c) 48000 (d) 96000
  30. 30.Round 49049 to the nearest thousand.
  31. 31.Round 64753 to the nearest ten.
  32. 32.Round 23862 to the nearest ten.
  33. 33.Round 46878 to the nearest ten.
  34. 34.Which is closest to 403 × 78? (Round each number first.) (a) 320000 (b) 3200 (c) 32000 (d) 64000
  35. 35.Which is closest to 997 ÷ 51? (a) 20 (b) 10 (c) 40 (d) 200
  36. 36.Which is closest to 703 + 499 + 203? (a) 1300 (b) 1500 (c) 1400 (d) 1600
  37. 37.Round 71892 to the nearest thousand.
  38. 38.Which is closest to 301 × 79? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
  39. 39.Which is closest to 403 + 200 + 896? (a) 1500 (b) 1600 (c) 1700 (d) 1400
  40. 40.Round 17.79 to one decimal place. =

Answer key

  1. 72000
  2. 26.6
  3. 40
  4. 1100
  5. 92.5
  6. 50
  7. 55100
  8. 60
  9. 8700
  10. 30.7
  11. 30
  12. 24000
  13. 48000
  14. 54000
  15. 50
  16. 1100
  17. 80
  18. 30
  19. 12000
  20. 24000
  21. 1700
  22. 28000
  23. 9000
  24. 30
  25. 68700
  26. 24800
  27. 25.4
  28. 55000
  29. 48000
  30. 49000
  31. 64750
  32. 23860
  33. 46880
  34. 32000
  35. 20
  36. 1400
  37. 72000
  38. 24000
  39. 1500
  40. 17.8

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