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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 361 · 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 92.63 to one decimal place. =
  2. 2.Which is closest to 599 + 295 + 397? (a) 1500 (b) 1400 (c) 1200 (d) 1300
  3. 3.Round 43466 to the nearest hundred.
  4. 4.Which is closest to 1405 ÷ 19? (a) 700 (b) 70 (c) 35 (d) 140
  5. 5.Which is closest to 3494 ÷ 49? (a) 700 (b) 35 (c) 140 (d) 70
  6. 6.Round 77954 to the nearest ten.
  7. 7.Which is closest to 2006 ÷ 41? (a) 100 (b) 500 (c) 50 (d) 25
  8. 8.Which is closest to 901 ÷ 31? (a) 60 (b) 30 (c) 300 (d) 15
  9. 9.Which is closest to 103 + 300 + 604? (a) 1200 (b) 900 (c) 1000 (d) 1100
  10. 10.Which is closest to 604 × 32? (Round each number first.) (a) 1800 (b) 36000 (c) 18000 (d) 180000
  11. 11.Which is closest to 296 + 302 + 695? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  12. 12.Round 54.07 to one decimal place. =
  13. 13.Which is closest to 597 + 405 + 695? (a) 1600 (b) 1800 (c) 1700 (d) 1900
  14. 14.Which is closest to 699 + 605 + 200? (a) 1700 (b) 1400 (c) 1500 (d) 1600
  15. 15.Which is closest to 400 + 199 + 903? (a) 1400 (b) 1500 (c) 1600 (d) 1700
  16. 16.Round 49243 to the nearest thousand.
  17. 17.Round 64.58 to one decimal place. =
  18. 18.Which is closest to 97 + 501 + 698? (a) 1500 (b) 1400 (c) 1300 (d) 1200
  19. 19.Round 74666 to the nearest thousand.
  20. 20.Round 47961 to the nearest ten.
  21. 21.Which is closest to 99 + 503 + 795? (a) 1600 (b) 1300 (c) 1400 (d) 1500
  22. 22.Which is closest to 901 × 21? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
  23. 23.Which is closest to 902 + 395 + 202? (a) 1600 (b) 1700 (c) 1500 (d) 1400
  24. 24.Which is closest to 801 + 101 + 701? (a) 1700 (b) 1600 (c) 1500 (d) 1800
  25. 25.Which is closest to 895 + 101 + 100? (a) 1000 (b) 1100 (c) 1200 (d) 1300
  26. 26.Which is closest to 702 × 38? (Round each number first.) (a) 280000 (b) 2800 (c) 28000 (d) 56000
  27. 27.Which is closest to 498 × 60? (Round each number first.) (a) 60000 (b) 300000 (c) 3000 (d) 30000
  28. 28.Which is closest to 900 × 41? (Round each number first.) (a) 3600 (b) 72000 (c) 36000 (d) 360000
  29. 29.Round 20.89 to one decimal place. =
  30. 30.Which is closest to 497 + 96 + 199? (a) 900 (b) 1000 (c) 800 (d) 700
  31. 31.Which is closest to 205 + 905 + 502? (a) 1500 (b) 1600 (c) 1800 (d) 1700
  32. 32.Which is closest to 1193 ÷ 19? (a) 120 (b) 60 (c) 600 (d) 30
  33. 33.Which is closest to 298 + 305 + 401? (a) 1100 (b) 1200 (c) 900 (d) 1000
  34. 34.Which is closest to 403 × 18? (Round each number first.) (a) 80000 (b) 16000 (c) 8000 (d) 800
  35. 35.Which is closest to 102 + 805 + 895? (a) 1700 (b) 2000 (c) 1900 (d) 1800
  36. 36.Round 14693 to the nearest hundred.
  37. 37.Which is closest to 297 × 92? (Round each number first.) (a) 270000 (b) 27000 (c) 2700 (d) 54000
  38. 38.Which is closest to 1401 ÷ 19? (a) 70 (b) 700 (c) 140 (d) 35
  39. 39.Which is closest to 899 × 68? (Round each number first.) (a) 630000 (b) 6300 (c) 126000 (d) 63000
  40. 40.Round 61857 to the nearest thousand.

Answer key

  1. 92.6
  2. 1300
  3. 43500
  4. 70
  5. 70
  6. 77950
  7. 50
  8. 30
  9. 1000
  10. 18000
  11. 1300
  12. 54.1
  13. 1700
  14. 1500
  15. 1500
  16. 49000
  17. 64.6
  18. 1300
  19. 75000
  20. 47960
  21. 1400
  22. 18000
  23. 1500
  24. 1600
  25. 1100
  26. 28000
  27. 30000
  28. 36000
  29. 20.9
  30. 800
  31. 1600
  32. 60
  33. 1000
  34. 8000
  35. 1800
  36. 14700
  37. 27000
  38. 70
  39. 63000
  40. 62000

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