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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 445 · 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 75.59 to one decimal place. =
  2. 2.Which is closest to 2791 ÷ 39? (a) 700 (b) 35 (c) 70 (d) 140
  3. 3.Round 25556 to the nearest thousand.
  4. 4.Which is closest to 905 + 799 + 801? (a) 2400 (b) 2700 (c) 2600 (d) 2500
  5. 5.Which is closest to 1503 ÷ 51? (a) 300 (b) 30 (c) 60 (d) 15
  6. 6.Which is closest to 903 ÷ 31? (a) 300 (b) 60 (c) 30 (d) 15
  7. 7.Which is closest to 605 + 604 + 395? (a) 1800 (b) 1700 (c) 1600 (d) 1500
  8. 8.Which is closest to 799 + 495 + 200? (a) 1400 (b) 1700 (c) 1600 (d) 1500
  9. 9.Which is closest to 904 × 18? (Round each number first.) (a) 1800 (b) 36000 (c) 18000 (d) 180000
  10. 10.Which is closest to 796 + 498 + 303? (a) 1800 (b) 1500 (c) 1600 (d) 1700
  11. 11.Which is closest to 2402 ÷ 39? (a) 120 (b) 600 (c) 30 (d) 60
  12. 12.Which is closest to 598 × 30? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  13. 13.Round 97.49 to one decimal place. =
  14. 14.Which is closest to 195 + 98 + 896? (a) 1200 (b) 1400 (c) 1300 (d) 1100
  15. 15.Round 95046 to the nearest hundred.
  16. 16.Which is closest to 1798 ÷ 19? (a) 90 (b) 180 (c) 900 (d) 45
  17. 17.Which is closest to 302 × 48? (Round each number first.) (a) 15000 (b) 1500 (c) 150000 (d) 30000
  18. 18.Which is closest to 701 × 88? (Round each number first.) (a) 630000 (b) 63000 (c) 6300 (d) 126000
  19. 19.Which is closest to 302 × 59? (Round each number first.) (a) 180000 (b) 1800 (c) 18000 (d) 36000
  20. 20.Which is closest to 2399 ÷ 39? (a) 60 (b) 120 (c) 600 (d) 30
  21. 21.Round 15.72 to one decimal place. =
  22. 22.Which is closest to 596 ÷ 29? (a) 10 (b) 200 (c) 40 (d) 20
  23. 23.Round 71966 to the nearest thousand.
  24. 24.Which is closest to 104 + 499 + 704? (a) 1300 (b) 1500 (c) 1400 (d) 1200
  25. 25.Which is closest to 301 + 96 + 403? (a) 1000 (b) 700 (c) 900 (d) 800
  26. 26.Which is closest to 1599 ÷ 19? (a) 80 (b) 40 (c) 160 (d) 800
  27. 27.Which is closest to 897 + 403 + 395? (a) 1900 (b) 1800 (c) 1600 (d) 1700
  28. 28.Round 11.86 to one decimal place. =
  29. 29.Round 32.42 to one decimal place. =
  30. 30.Which is closest to 702 × 22? (Round each number first.) (a) 1400 (b) 140000 (c) 14000 (d) 28000
  31. 31.Round 22.54 to one decimal place. =
  32. 32.Which is closest to 403 × 32? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200
  33. 33.Which is closest to 703 × 80? (Round each number first.) (a) 56000 (b) 5600 (c) 112000 (d) 560000
  34. 34.Which is closest to 406 ÷ 21? (a) 10 (b) 40 (c) 20 (d) 200
  35. 35.Round 90.44 to one decimal place. =
  36. 36.Which is closest to 404 × 68? (Round each number first.) (a) 280000 (b) 56000 (c) 2800 (d) 28000
  37. 37.Which is closest to 397 × 59? (Round each number first.) (a) 240000 (b) 24000 (c) 48000 (d) 2400
  38. 38.Which is closest to 2797 ÷ 41? (a) 700 (b) 35 (c) 140 (d) 70
  39. 39.Which is closest to 196 + 903 + 503? (a) 1800 (b) 1500 (c) 1600 (d) 1700
  40. 40.Which is closest to 799 + 601 + 297? (a) 1600 (b) 1900 (c) 1700 (d) 1800

Answer key

  1. 75.6
  2. 70
  3. 26000
  4. 2500
  5. 30
  6. 30
  7. 1600
  8. 1500
  9. 18000
  10. 1600
  11. 60
  12. 18000
  13. 97.5
  14. 1200
  15. 95000
  16. 90
  17. 15000
  18. 63000
  19. 18000
  20. 60
  21. 15.7
  22. 20
  23. 72000
  24. 1300
  25. 800
  26. 80
  27. 1700
  28. 11.9
  29. 32.4
  30. 14000
  31. 22.5
  32. 12000
  33. 56000
  34. 20
  35. 90.4
  36. 28000
  37. 24000
  38. 70
  39. 1600
  40. 1700

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