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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 63 · 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 82.06 to one decimal place. =
  2. 2.Round 25793 to the nearest thousand.
  3. 3.Which is closest to 396 × 32? (Round each number first.) (a) 120000 (b) 12000 (c) 24000 (d) 1200
  4. 4.Which is closest to 901 × 18? (Round each number first.) (a) 36000 (b) 180000 (c) 18000 (d) 1800
  5. 5.Which is closest to 796 + 596 + 805? (a) 2100 (b) 2200 (c) 2300 (d) 2400
  6. 6.Which is closest to 596 × 68? (Round each number first.) (a) 42000 (b) 4200 (c) 84000 (d) 420000
  7. 7.Round 14.22 to one decimal place. =
  8. 8.Which is closest to 2807 ÷ 41? (a) 140 (b) 70 (c) 35 (d) 700
  9. 9.Which is closest to 605 + 799 + 598? (a) 2200 (b) 2000 (c) 1900 (d) 2100
  10. 10.Which is closest to 301 × 50? (Round each number first.) (a) 30000 (b) 150000 (c) 1500 (d) 15000
  11. 11.Which is closest to 593 ÷ 29? (a) 10 (b) 200 (c) 20 (d) 40
  12. 12.Which is closest to 403 + 702 + 404? (a) 1700 (b) 1400 (c) 1500 (d) 1600
  13. 13.Round 21009 to the nearest hundred.
  14. 14.Round 67.26 to one decimal place. =
  15. 15.Round 28.94 to one decimal place. =
  16. 16.Which is closest to 596 + 895 + 897? (a) 2500 (b) 2300 (c) 2600 (d) 2400
  17. 17.Round 96603 to the nearest ten.
  18. 18.Which is closest to 197 + 395 + 102? (a) 800 (b) 600 (c) 700 (d) 900
  19. 19.Which is closest to 198 + 102 + 504? (a) 800 (b) 900 (c) 700 (d) 1000
  20. 20.Which is closest to 796 × 32? (Round each number first.) (a) 2400 (b) 48000 (c) 24000 (d) 240000
  21. 21.Round 17542 to the nearest ten.
  22. 22.Which is closest to 705 + 802 + 296? (a) 2000 (b) 1800 (c) 1700 (d) 1900
  23. 23.Round 19.89 to one decimal place. =
  24. 24.Round 70.86 to one decimal place. =
  25. 25.Round 11.83 to one decimal place. =
  26. 26.Round 31.43 to one decimal place. =
  27. 27.Which is closest to 4507 ÷ 51? (a) 45 (b) 90 (c) 900 (d) 180
  28. 28.Which is closest to 597 + 196 + 799? (a) 1500 (b) 1700 (c) 1800 (d) 1600
  29. 29.Round 54.12 to one decimal place. =
  30. 30.Round 65206 to the nearest ten.
  31. 31.Round 28.54 to one decimal place. =
  32. 32.Round 69761 to the nearest thousand.
  33. 33.Which is closest to 402 × 92? (Round each number first.) (a) 3600 (b) 36000 (c) 360000 (d) 72000
  34. 34.Which is closest to 404 × 88? (Round each number first.) (a) 36000 (b) 3600 (c) 360000 (d) 72000
  35. 35.Which is closest to 997 ÷ 49? (a) 200 (b) 20 (c) 10 (d) 40
  36. 36.Round 15097 to the nearest ten.
  37. 37.Which is closest to 198 × 28? (Round each number first.) (a) 12000 (b) 6000 (c) 600 (d) 60000
  38. 38.Which is closest to 395 + 299 + 205? (a) 1000 (b) 1100 (c) 900 (d) 800
  39. 39.Round 89.86 to one decimal place. =
  40. 40.Which is closest to 498 × 69? (Round each number first.) (a) 35000 (b) 350000 (c) 3500 (d) 70000

Answer key

  1. 82.1
  2. 26000
  3. 12000
  4. 18000
  5. 2200
  6. 42000
  7. 14.2
  8. 70
  9. 2000
  10. 15000
  11. 20
  12. 1500
  13. 21000
  14. 67.3
  15. 28.9
  16. 2400
  17. 96600
  18. 700
  19. 800
  20. 24000
  21. 17540
  22. 1800
  23. 19.9
  24. 70.9
  25. 11.8
  26. 31.4
  27. 90
  28. 1600
  29. 54.1
  30. 65210
  31. 28.5
  32. 70000
  33. 36000
  34. 36000
  35. 20
  36. 15100
  37. 6000
  38. 900
  39. 89.9
  40. 35000

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