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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 668 · 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 502 × 59? (Round each number first.) (a) 300000 (b) 3000 (c) 30000 (d) 60000
  2. 2.Round 28.31 to one decimal place. =
  3. 3.Round 80.11 to one decimal place. =
  4. 4.Which is closest to 1997 ÷ 49? (a) 20 (b) 40 (c) 400 (d) 80
  5. 5.Which is closest to 197 × 52? (Round each number first.) (a) 10000 (b) 20000 (c) 100000 (d) 1000
  6. 6.Round 36.09 to one decimal place. =
  7. 7.Which is closest to 205 + 504 + 603? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  8. 8.Which is closest to 904 × 59? (Round each number first.) (a) 540000 (b) 5400 (c) 108000 (d) 54000
  9. 9.Which is closest to 298 + 701 + 105? (a) 1100 (b) 1000 (c) 1200 (d) 1300
  10. 10.Round 73.22 to one decimal place. =
  11. 11.Round 32.69 to one decimal place. =
  12. 12.Which is closest to 1505 ÷ 29? (a) 500 (b) 50 (c) 25 (d) 100
  13. 13.Which is closest to 796 + 100 + 898? (a) 1700 (b) 2000 (c) 1800 (d) 1900
  14. 14.Round 58.12 to one decimal place. =
  15. 15.Which is closest to 1994 ÷ 51? (a) 400 (b) 80 (c) 40 (d) 20
  16. 16.Which is closest to 300 + 897 + 696? (a) 1800 (b) 1900 (c) 2000 (d) 2100
  17. 17.Which is closest to 896 + 896 + 103? (a) 2100 (b) 1800 (c) 1900 (d) 2000
  18. 18.Which is closest to 300 × 29? (Round each number first.) (a) 18000 (b) 90000 (c) 9000 (d) 900
  19. 19.Round 35687 to the nearest thousand.
  20. 20.Round 55318 to the nearest thousand.
  21. 21.Round 24393 to the nearest hundred.
  22. 22.Which is closest to 704 × 70? (Round each number first.) (a) 4900 (b) 98000 (c) 490000 (d) 49000
  23. 23.Round 16482 to the nearest ten.
  24. 24.Which is closest to 296 + 898 + 598? (a) 1800 (b) 2000 (c) 1900 (d) 1700
  25. 25.Which is closest to 198 × 60? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
  26. 26.Which is closest to 602 × 68? (Round each number first.) (a) 4200 (b) 420000 (c) 84000 (d) 42000
  27. 27.Which is closest to 702 × 20? (Round each number first.) (a) 140000 (b) 28000 (c) 1400 (d) 14000
  28. 28.Round 24.26 to one decimal place. =
  29. 29.Which is closest to 700 × 59? (Round each number first.) (a) 42000 (b) 4200 (c) 420000 (d) 84000
  30. 30.Which is closest to 296 × 60? (Round each number first.) (a) 18000 (b) 1800 (c) 180000 (d) 36000
  31. 31.Round 42504 to the nearest hundred.
  32. 32.Round 22903 to the nearest thousand.
  33. 33.Round 42.88 to one decimal place. =
  34. 34.Which is closest to 1003 ÷ 21? (a) 25 (b) 500 (c) 100 (d) 50
  35. 35.Which is closest to 605 + 398 + 495? (a) 1600 (b) 1400 (c) 1500 (d) 1700
  36. 36.Round 37.88 to one decimal place. =
  37. 37.Round 84.82 to one decimal place. =
  38. 38.Which is closest to 496 × 70? (Round each number first.) (a) 70000 (b) 350000 (c) 35000 (d) 3500
  39. 39.Round 11177 to the nearest ten.
  40. 40.Round 54688 to the nearest hundred.

Answer key

  1. 30000
  2. 28.3
  3. 80.1
  4. 40
  5. 10000
  6. 36.1
  7. 1300
  8. 54000
  9. 1100
  10. 73.2
  11. 32.7
  12. 50
  13. 1800
  14. 58.1
  15. 40
  16. 1900
  17. 1900
  18. 9000
  19. 36000
  20. 55000
  21. 24400
  22. 49000
  23. 16480
  24. 1800
  25. 12000
  26. 42000
  27. 14000
  28. 24.3
  29. 42000
  30. 18000
  31. 42500
  32. 23000
  33. 42.9
  34. 50
  35. 1500
  36. 37.9
  37. 84.8
  38. 35000
  39. 11180
  40. 54700

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