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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 623 · 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 795 ÷ 39? (a) 40 (b) 200 (c) 10 (d) 20
  2. 2.Which is closest to 802 × 29? (Round each number first.) (a) 24000 (b) 240000 (c) 48000 (d) 2400
  3. 3.Which is closest to 597 + 605 + 895? (a) 2100 (b) 2000 (c) 2200 (d) 2300
  4. 4.Round 75.74 to one decimal place. =
  5. 5.Which is closest to 499 × 88? (Round each number first.) (a) 450000 (b) 4500 (c) 90000 (d) 45000
  6. 6.Round 63317 to the nearest ten.
  7. 7.Round 44456 to the nearest hundred.
  8. 8.Round 18241 to the nearest thousand.
  9. 9.Round 90.57 to one decimal place. =
  10. 10.Round 36.17 to one decimal place. =
  11. 11.Which is closest to 1593 ÷ 39? (a) 20 (b) 400 (c) 80 (d) 40
  12. 12.Round 42.11 to one decimal place. =
  13. 13.Which is closest to 793 ÷ 41? (a) 40 (b) 200 (c) 10 (d) 20
  14. 14.Which is closest to 604 × 69? (Round each number first.) (a) 84000 (b) 420000 (c) 42000 (d) 4200
  15. 15.Which is closest to 2400 ÷ 29? (a) 160 (b) 40 (c) 80 (d) 800
  16. 16.Which is closest to 503 + 497 + 599? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  17. 17.Round 86797 to the nearest ten.
  18. 18.Which is closest to 897 + 604 + 397? (a) 1800 (b) 2000 (c) 1900 (d) 2100
  19. 19.Round 90553 to the nearest thousand.
  20. 20.Which is closest to 199 × 42? (Round each number first.) (a) 8000 (b) 800 (c) 16000 (d) 80000
  21. 21.Which is closest to 704 + 501 + 696? (a) 1800 (b) 2000 (c) 2100 (d) 1900
  22. 22.Round 97118 to the nearest ten.
  23. 23.Which is closest to 696 × 59? (Round each number first.) (a) 84000 (b) 42000 (c) 420000 (d) 4200
  24. 24.Which is closest to 403 + 303 + 803? (a) 1500 (b) 1700 (c) 1400 (d) 1600
  25. 25.Round 35492 to the nearest hundred.
  26. 26.Round 10752 to the nearest thousand.
  27. 27.Round 54.24 to one decimal place. =
  28. 28.Which is closest to 601 + 202 + 696? (a) 1600 (b) 1400 (c) 1700 (d) 1500
  29. 29.Round 29367 to the nearest thousand.
  30. 30.Which is closest to 804 + 103 + 498? (a) 1400 (b) 1600 (c) 1300 (d) 1500
  31. 31.Which is closest to 197 + 700 + 105? (a) 1200 (b) 900 (c) 1000 (d) 1100
  32. 32.Round 94.83 to one decimal place. =
  33. 33.Which is closest to 800 × 28? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  34. 34.Which is closest to 893 ÷ 29? (a) 30 (b) 60 (c) 300 (d) 15
  35. 35.Which is closest to 297 × 38? (Round each number first.) (a) 120000 (b) 12000 (c) 24000 (d) 1200
  36. 36.Which is closest to 902 × 71? (Round each number first.) (a) 6300 (b) 63000 (c) 126000 (d) 630000
  37. 37.Which is closest to 3600 ÷ 41? (a) 900 (b) 180 (c) 90 (d) 45
  38. 38.Which is closest to 1204 ÷ 29? (a) 80 (b) 40 (c) 20 (d) 400
  39. 39.Round 38923 to the nearest thousand.
  40. 40.Which is closest to 504 × 32? (Round each number first.) (a) 150000 (b) 1500 (c) 30000 (d) 15000

Answer key

  1. 20
  2. 24000
  3. 2100
  4. 75.7
  5. 45000
  6. 63320
  7. 44500
  8. 18000
  9. 90.6
  10. 36.2
  11. 40
  12. 42.1
  13. 20
  14. 42000
  15. 80
  16. 1600
  17. 86800
  18. 1900
  19. 91000
  20. 8000
  21. 1900
  22. 97120
  23. 42000
  24. 1500
  25. 35500
  26. 11000
  27. 54.2
  28. 1500
  29. 29000
  30. 1400
  31. 1000
  32. 94.8
  33. 24000
  34. 30
  35. 12000
  36. 63000
  37. 90
  38. 40
  39. 39000
  40. 15000

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