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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 934 · 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 32.13 to one decimal place. =
  2. 2.Which is closest to 897 × 19? (Round each number first.) (a) 18000 (b) 1800 (c) 36000 (d) 180000
  3. 3.Which is closest to 699 × 52? (Round each number first.) (a) 3500 (b) 350000 (c) 70000 (d) 35000
  4. 4.Round 6158 to the nearest ten.
  5. 5.Which is closest to 900 + 497 + 796? (a) 2100 (b) 2300 (c) 2400 (d) 2200
  6. 6.Round 60.66 to one decimal place. =
  7. 7.Which is closest to 702 × 21? (Round each number first.) (a) 1400 (b) 140000 (c) 28000 (d) 14000
  8. 8.Round 80.78 to one decimal place. =
  9. 9.Round 53924 to the nearest hundred.
  10. 10.Which is closest to 304 × 79? (Round each number first.) (a) 24000 (b) 2400 (c) 240000 (d) 48000
  11. 11.Round 97.26 to one decimal place. =
  12. 12.Round 35962 to the nearest hundred.
  13. 13.Round 17409 to the nearest hundred.
  14. 14.Which is closest to 1502 ÷ 51? (a) 30 (b) 60 (c) 300 (d) 15
  15. 15.Which is closest to 403 + 797 + 397? (a) 1600 (b) 1700 (c) 1800 (d) 1500
  16. 16.Round 10.72 to one decimal place. =
  17. 17.Round 34.06 to one decimal place. =
  18. 18.Which is closest to 596 × 69? (Round each number first.) (a) 42000 (b) 84000 (c) 4200 (d) 420000
  19. 19.Which is closest to 1002 ÷ 51? (a) 200 (b) 20 (c) 10 (d) 40
  20. 20.Round 77863 to the nearest hundred.
  21. 21.Round 47.12 to one decimal place. =
  22. 22.Round 82906 to the nearest hundred.
  23. 23.Which is closest to 97 + 295 + 905? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  24. 24.Which is closest to 702 × 51? (Round each number first.) (a) 350000 (b) 70000 (c) 35000 (d) 3500
  25. 25.Round 92047 to the nearest thousand.
  26. 26.Which is closest to 303 + 801 + 596? (a) 1900 (b) 1800 (c) 1600 (d) 1700
  27. 27.Which is closest to 402 + 800 + 298? (a) 1400 (b) 1500 (c) 1700 (d) 1600
  28. 28.Which is closest to 3491 ÷ 51? (a) 140 (b) 35 (c) 70 (d) 700
  29. 29.Which is closest to 299 × 21? (Round each number first.) (a) 600 (b) 6000 (c) 60000 (d) 12000
  30. 30.Which is closest to 600 × 21? (Round each number first.) (a) 1200 (b) 12000 (c) 120000 (d) 24000
  31. 31.Which is closest to 2508 ÷ 51? (a) 25 (b) 100 (c) 500 (d) 50
  32. 32.Which is closest to 805 ÷ 39? (a) 10 (b) 20 (c) 40 (d) 200
  33. 33.Which is closest to 803 × 58? (Round each number first.) (a) 480000 (b) 96000 (c) 4800 (d) 48000
  34. 34.Which is closest to 2697 ÷ 29? (a) 90 (b) 900 (c) 180 (d) 45
  35. 35.Which is closest to 1207 ÷ 21? (a) 120 (b) 60 (c) 600 (d) 30
  36. 36.Round 52338 to the nearest hundred.
  37. 37.Round 12.71 to one decimal place. =
  38. 38.Which is closest to 395 + 804 + 402? (a) 1600 (b) 1700 (c) 1500 (d) 1800
  39. 39.Round 50.89 to one decimal place. =
  40. 40.Which is closest to 196 + 401 + 797? (a) 1500 (b) 1400 (c) 1600 (d) 1300

Answer key

  1. 32.1
  2. 18000
  3. 35000
  4. 6160
  5. 2200
  6. 60.7
  7. 14000
  8. 80.8
  9. 53900
  10. 24000
  11. 97.3
  12. 36000
  13. 17400
  14. 30
  15. 1600
  16. 10.7
  17. 34.1
  18. 42000
  19. 20
  20. 77900
  21. 47.1
  22. 82900
  23. 1300
  24. 35000
  25. 92000
  26. 1700
  27. 1500
  28. 70
  29. 6000
  30. 12000
  31. 50
  32. 20
  33. 48000
  34. 90
  35. 60
  36. 52300
  37. 12.7
  38. 1600
  39. 50.9
  40. 1400

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