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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 51 · 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 13282 to the nearest hundred.
  2. 2.Round 69.17 to one decimal place. =
  3. 3.Which is closest to 797 × 41? (Round each number first.) (a) 64000 (b) 3200 (c) 320000 (d) 32000
  4. 4.Round 65122 to the nearest hundred.
  5. 5.Round 33.84 to one decimal place. =
  6. 6.Which is closest to 900 × 61? (Round each number first.) (a) 5400 (b) 540000 (c) 108000 (d) 54000
  7. 7.Which is closest to 696 × 71? (Round each number first.) (a) 49000 (b) 490000 (c) 98000 (d) 4900
  8. 8.Round 83.78 to one decimal place. =
  9. 9.Round 57.67 to one decimal place. =
  10. 10.Round 83.77 to one decimal place. =
  11. 11.Which is closest to 695 + 103 + 402? (a) 1200 (b) 1100 (c) 1300 (d) 1400
  12. 12.Which is closest to 1996 ÷ 51? (a) 400 (b) 40 (c) 20 (d) 80
  13. 13.Which is closest to 600 × 32? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
  14. 14.Which is closest to 2097 ÷ 31? (a) 140 (b) 70 (c) 700 (d) 35
  15. 15.Round 54372 to the nearest thousand.
  16. 16.Which is closest to 200 × 59? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
  17. 17.Which is closest to 799 ÷ 39? (a) 20 (b) 200 (c) 40 (d) 10
  18. 18.Round 85097 to the nearest hundred.
  19. 19.Which is closest to 203 × 29? (Round each number first.) (a) 12000 (b) 600 (c) 60000 (d) 6000
  20. 20.Which is closest to 899 + 99 + 396? (a) 1600 (b) 1400 (c) 1500 (d) 1300
  21. 21.Which is closest to 2000 ÷ 39? (a) 500 (b) 100 (c) 50 (d) 25
  22. 22.Which is closest to 504 + 403 + 696? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  23. 23.Round 28283 to the nearest hundred.
  24. 24.Which is closest to 197 + 495 + 102? (a) 800 (b) 1000 (c) 700 (d) 900
  25. 25.Which is closest to 796 × 28? (Round each number first.) (a) 24000 (b) 240000 (c) 48000 (d) 2400
  26. 26.Which is closest to 198 + 698 + 501? (a) 1600 (b) 1300 (c) 1500 (d) 1400
  27. 27.Round 92699 to the nearest ten.
  28. 28.Round 71804 to the nearest ten.
  29. 29.Which is closest to 905 ÷ 29? (a) 300 (b) 60 (c) 30 (d) 15
  30. 30.Round 33774 to the nearest hundred.
  31. 31.Round 85158 to the nearest thousand.
  32. 32.Which is closest to 601 × 82? (Round each number first.) (a) 4800 (b) 480000 (c) 48000 (d) 96000
  33. 33.Which is closest to 597 × 68? (Round each number first.) (a) 84000 (b) 4200 (c) 420000 (d) 42000
  34. 34.Which is closest to 295 + 97 + 497? (a) 1000 (b) 900 (c) 800 (d) 1100
  35. 35.Which is closest to 402 + 595 + 96? (a) 1000 (b) 1100 (c) 1300 (d) 1200
  36. 36.Which is closest to 897 × 50? (Round each number first.) (a) 4500 (b) 90000 (c) 45000 (d) 450000
  37. 37.Which is closest to 197 × 89? (Round each number first.) (a) 18000 (b) 36000 (c) 180000 (d) 1800
  38. 38.Round 31.59 to one decimal place. =
  39. 39.Round 65.68 to one decimal place. =
  40. 40.Round 96729 to the nearest hundred.

Answer key

  1. 13300
  2. 69.2
  3. 32000
  4. 65100
  5. 33.8
  6. 54000
  7. 49000
  8. 83.8
  9. 57.7
  10. 83.8
  11. 1200
  12. 40
  13. 18000
  14. 70
  15. 54000
  16. 12000
  17. 20
  18. 85100
  19. 6000
  20. 1400
  21. 50
  22. 1600
  23. 28300
  24. 800
  25. 24000
  26. 1400
  27. 92700
  28. 71800
  29. 30
  30. 33800
  31. 85000
  32. 48000
  33. 42000
  34. 900
  35. 1100
  36. 45000
  37. 18000
  38. 31.6
  39. 65.7
  40. 96700

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