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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 787 · 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 404 × 69? (Round each number first.) (a) 28000 (b) 2800 (c) 56000 (d) 280000
  2. 2.Round 64.57 to one decimal place. =
  3. 3.Which is closest to 598 × 28? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  4. 4.Which is closest to 401 ÷ 21? (a) 200 (b) 40 (c) 10 (d) 20
  5. 5.Which is closest to 301 × 61? (Round each number first.) (a) 180000 (b) 18000 (c) 1800 (d) 36000
  6. 6.Round 75.71 to one decimal place. =
  7. 7.Which is closest to 396 × 91? (Round each number first.) (a) 72000 (b) 36000 (c) 3600 (d) 360000
  8. 8.Round 21.28 to one decimal place. =
  9. 9.Which is closest to 504 + 699 + 405? (a) 1600 (b) 1500 (c) 1800 (d) 1700
  10. 10.Round 63.68 to one decimal place. =
  11. 11.Which is closest to 498 × 81? (Round each number first.) (a) 80000 (b) 4000 (c) 40000 (d) 400000
  12. 12.Which is closest to 296 × 60? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
  13. 13.Which is closest to 597 × 30? (Round each number first.) (a) 18000 (b) 180000 (c) 36000 (d) 1800
  14. 14.Which is closest to 396 × 49? (Round each number first.) (a) 2000 (b) 20000 (c) 200000 (d) 40000
  15. 15.Which is closest to 898 + 504 + 795? (a) 2400 (b) 2100 (c) 2300 (d) 2200
  16. 16.Round 29099 to the nearest thousand.
  17. 17.Round 24013 to the nearest thousand.
  18. 18.Round 91.29 to one decimal place. =
  19. 19.Which is closest to 902 × 70? (Round each number first.) (a) 6300 (b) 630000 (c) 63000 (d) 126000
  20. 20.Which is closest to 1502 ÷ 49? (a) 60 (b) 300 (c) 15 (d) 30
  21. 21.Round 62882 to the nearest ten.
  22. 22.Which is closest to 102 + 698 + 696? (a) 1700 (b) 1600 (c) 1400 (d) 1500
  23. 23.Which is closest to 704 + 601 + 297? (a) 1700 (b) 1800 (c) 1600 (d) 1500
  24. 24.Round 66662 to the nearest thousand.
  25. 25.Which is closest to 3995 ÷ 51? (a) 80 (b) 160 (c) 40 (d) 800
  26. 26.Round 63.58 to one decimal place. =
  27. 27.Which is closest to 704 × 31? (Round each number first.) (a) 210000 (b) 21000 (c) 42000 (d) 2100
  28. 28.Which is closest to 600 × 48? (Round each number first.) (a) 3000 (b) 300000 (c) 30000 (d) 60000
  29. 29.Which is closest to 1791 ÷ 29? (a) 120 (b) 600 (c) 60 (d) 30
  30. 30.Which is closest to 599 × 92? (Round each number first.) (a) 540000 (b) 108000 (c) 54000 (d) 5400
  31. 31.Which is closest to 704 × 52? (Round each number first.) (a) 35000 (b) 350000 (c) 70000 (d) 3500
  32. 32.Which is closest to 304 + 596 + 398? (a) 1500 (b) 1200 (c) 1400 (d) 1300
  33. 33.Which is closest to 296 × 28? (Round each number first.) (a) 18000 (b) 9000 (c) 900 (d) 90000
  34. 34.Round 20.44 to one decimal place. =
  35. 35.Round 52.47 to one decimal place. =
  36. 36.Which is closest to 196 × 42? (Round each number first.) (a) 80000 (b) 16000 (c) 800 (d) 8000
  37. 37.Round 76044 to the nearest hundred.
  38. 38.Round 44.37 to one decimal place. =
  39. 39.Which is closest to 403 + 200 + 703? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  40. 40.Round 14.17 to one decimal place. =

Answer key

  1. 28000
  2. 64.6
  3. 18000
  4. 20
  5. 18000
  6. 75.7
  7. 36000
  8. 21.3
  9. 1600
  10. 63.7
  11. 40000
  12. 18000
  13. 18000
  14. 20000
  15. 2200
  16. 29000
  17. 24000
  18. 91.3
  19. 63000
  20. 30
  21. 62880
  22. 1500
  23. 1600
  24. 67000
  25. 80
  26. 63.6
  27. 21000
  28. 30000
  29. 60
  30. 54000
  31. 35000
  32. 1300
  33. 9000
  34. 20.4
  35. 52.5
  36. 8000
  37. 76000
  38. 44.4
  39. 1300
  40. 14.2

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