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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 47 · 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 4492 ÷ 49? (a) 900 (b) 45 (c) 90 (d) 180
  2. 2.Which is closest to 296 + 501 + 802? (a) 1600 (b) 1700 (c) 1800 (d) 1500
  3. 3.Which is closest to 799 × 59? (Round each number first.) (a) 48000 (b) 480000 (c) 4800 (d) 96000
  4. 4.Round 88449 to the nearest ten.
  5. 5.Round 40769 to the nearest ten.
  6. 6.Which is closest to 2694 ÷ 31? (a) 45 (b) 90 (c) 900 (d) 180
  7. 7.Round 86.13 to one decimal place. =
  8. 8.Which is closest to 604 × 41? (Round each number first.) (a) 240000 (b) 48000 (c) 24000 (d) 2400
  9. 9.Round 30.78 to one decimal place. =
  10. 10.Which is closest to 297 + 103 + 395? (a) 1000 (b) 700 (c) 900 (d) 800
  11. 11.Which is closest to 199 × 20? (Round each number first.) (a) 400 (b) 40000 (c) 8000 (d) 4000
  12. 12.Which is closest to 101 + 103 + 405? (a) 800 (b) 500 (c) 700 (d) 600
  13. 13.Which is closest to 1399 ÷ 19? (a) 140 (b) 70 (c) 700 (d) 35
  14. 14.Which is closest to 297 × 72? (Round each number first.) (a) 2100 (b) 21000 (c) 42000 (d) 210000
  15. 15.Round 41387 to the nearest ten.
  16. 16.Round 69.39 to one decimal place. =
  17. 17.Which is closest to 898 × 42? (Round each number first.) (a) 3600 (b) 72000 (c) 36000 (d) 360000
  18. 18.Which is closest to 603 × 49? (Round each number first.) (a) 3000 (b) 60000 (c) 30000 (d) 300000
  19. 19.Round 21.06 to one decimal place. =
  20. 20.Which is closest to 1005 ÷ 19? (a) 500 (b) 25 (c) 100 (d) 50
  21. 21.Which is closest to 699 × 49? (Round each number first.) (a) 35000 (b) 350000 (c) 70000 (d) 3500
  22. 22.Which is closest to 803 + 95 + 896? (a) 1900 (b) 1800 (c) 2000 (d) 1700
  23. 23.Round 87.91 to one decimal place. =
  24. 24.Round 30.07 to one decimal place. =
  25. 25.Which is closest to 204 × 29? (Round each number first.) (a) 12000 (b) 6000 (c) 600 (d) 60000
  26. 26.Which is closest to 799 + 501 + 496? (a) 1900 (b) 2000 (c) 1700 (d) 1800
  27. 27.Which is closest to 205 + 102 + 803? (a) 1300 (b) 1000 (c) 1200 (d) 1100
  28. 28.Which is closest to 100 + 902 + 496? (a) 1700 (b) 1400 (c) 1600 (d) 1500
  29. 29.Which is closest to 804 × 22? (Round each number first.) (a) 16000 (b) 1600 (c) 32000 (d) 160000
  30. 30.Which is closest to 599 × 32? (Round each number first.) (a) 180000 (b) 36000 (c) 18000 (d) 1800
  31. 31.Which is closest to 904 ÷ 31? (a) 300 (b) 60 (c) 15 (d) 30
  32. 32.Which is closest to 202 + 398 + 800? (a) 1600 (b) 1500 (c) 1300 (d) 1400
  33. 33.Round 53422 to the nearest ten.
  34. 34.Which is closest to 301 + 404 + 296? (a) 1100 (b) 900 (c) 1200 (d) 1000
  35. 35.Round 35.53 to one decimal place. =
  36. 36.Which is closest to 999 ÷ 51? (a) 40 (b) 10 (c) 200 (d) 20
  37. 37.Which is closest to 96 + 402 + 198? (a) 900 (b) 800 (c) 700 (d) 600
  38. 38.Round 44858 to the nearest thousand.
  39. 39.Round 46.47 to one decimal place. =
  40. 40.Which is closest to 399 × 59? (Round each number first.) (a) 24000 (b) 48000 (c) 240000 (d) 2400

Answer key

  1. 90
  2. 1600
  3. 48000
  4. 88450
  5. 40770
  6. 90
  7. 86.1
  8. 24000
  9. 30.8
  10. 800
  11. 4000
  12. 600
  13. 70
  14. 21000
  15. 41390
  16. 69.4
  17. 36000
  18. 30000
  19. 21.1
  20. 50
  21. 35000
  22. 1800
  23. 87.9
  24. 30.1
  25. 6000
  26. 1800
  27. 1100
  28. 1500
  29. 16000
  30. 18000
  31. 30
  32. 1400
  33. 53420
  34. 1000
  35. 35.5
  36. 20
  37. 700
  38. 45000
  39. 46.5
  40. 24000

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