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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 697 · 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 13.87 to one decimal place. =
  2. 2.Round 98.38 to one decimal place. =
  3. 3.Which is closest to 504 × 91? (Round each number first.) (a) 90000 (b) 45000 (c) 450000 (d) 4500
  4. 4.Which is closest to 796 × 28? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  5. 5.Which is closest to 2805 ÷ 39? (a) 700 (b) 70 (c) 140 (d) 35
  6. 6.Which is closest to 1007 ÷ 49? (a) 10 (b) 200 (c) 40 (d) 20
  7. 7.Round 22.76 to one decimal place. =
  8. 8.Round 39.67 to one decimal place. =
  9. 9.Which is closest to 4000 ÷ 49? (a) 800 (b) 40 (c) 160 (d) 80
  10. 10.Which is closest to 597 + 600 + 304? (a) 1700 (b) 1600 (c) 1400 (d) 1500
  11. 11.Round 21.32 to one decimal place. =
  12. 12.Which is closest to 204 × 62? (Round each number first.) (a) 1200 (b) 24000 (c) 120000 (d) 12000
  13. 13.Round 87.61 to one decimal place. =
  14. 14.Round 55742 to the nearest ten.
  15. 15.Round 62.07 to one decimal place. =
  16. 16.Which is closest to 897 × 91? (Round each number first.) (a) 8100 (b) 81000 (c) 810000 (d) 162000
  17. 17.Round 56.44 to one decimal place. =
  18. 18.Round 91276 to the nearest thousand.
  19. 19.Round 86.14 to one decimal place. =
  20. 20.Which is closest to 2409 ÷ 31? (a) 160 (b) 800 (c) 40 (d) 80
  21. 21.Which is closest to 602 × 78? (Round each number first.) (a) 4800 (b) 48000 (c) 96000 (d) 480000
  22. 22.Which is closest to 403 × 40? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
  23. 23.Which is closest to 1607 ÷ 19? (a) 160 (b) 80 (c) 40 (d) 800
  24. 24.Which is closest to 602 × 49? (Round each number first.) (a) 60000 (b) 3000 (c) 300000 (d) 30000
  25. 25.Round 25.79 to one decimal place. =
  26. 26.Which is closest to 2404 ÷ 31? (a) 40 (b) 80 (c) 800 (d) 160
  27. 27.Round 98.44 to one decimal place. =
  28. 28.Which is closest to 1002 ÷ 49? (a) 200 (b) 40 (c) 20 (d) 10
  29. 29.Round 21.83 to one decimal place. =
  30. 30.Round 36672 to the nearest hundred.
  31. 31.Which is closest to 103 + 800 + 400? (a) 1500 (b) 1400 (c) 1300 (d) 1200
  32. 32.Round 24.61 to one decimal place. =
  33. 33.Which is closest to 96 + 700 + 800? (a) 1800 (b) 1700 (c) 1500 (d) 1600
  34. 34.Which is closest to 392 ÷ 21? (a) 20 (b) 10 (c) 200 (d) 40
  35. 35.Which is closest to 696 × 20? (Round each number first.) (a) 14000 (b) 28000 (c) 140000 (d) 1400
  36. 36.Round 40.11 to one decimal place. =
  37. 37.Round 19891 to the nearest hundred.
  38. 38.Which is closest to 2095 ÷ 31? (a) 35 (b) 70 (c) 700 (d) 140
  39. 39.Round 91.38 to one decimal place. =
  40. 40.Which is closest to 796 + 395 + 598? (a) 1800 (b) 2000 (c) 1900 (d) 1700

Answer key

  1. 13.9
  2. 98.4
  3. 45000
  4. 24000
  5. 70
  6. 20
  7. 22.8
  8. 39.7
  9. 80
  10. 1500
  11. 21.3
  12. 12000
  13. 87.6
  14. 55740
  15. 62.1
  16. 81000
  17. 56.4
  18. 91000
  19. 86.1
  20. 80
  21. 48000
  22. 16000
  23. 80
  24. 30000
  25. 25.8
  26. 80
  27. 98.4
  28. 20
  29. 21.8
  30. 36700
  31. 1300
  32. 24.6
  33. 1600
  34. 20
  35. 14000
  36. 40.1
  37. 19900
  38. 70
  39. 91.4
  40. 1800

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