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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 566 · 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 71863 to the nearest thousand.
  2. 2.Which is closest to 598 × 60? (Round each number first.) (a) 360000 (b) 72000 (c) 3600 (d) 36000
  3. 3.Which is closest to 198 + 605 + 101? (a) 1100 (b) 800 (c) 900 (d) 1000
  4. 4.Which is closest to 300 × 92? (Round each number first.) (a) 270000 (b) 2700 (c) 27000 (d) 54000
  5. 5.Which is closest to 601 × 92? (Round each number first.) (a) 54000 (b) 108000 (c) 5400 (d) 540000
  6. 6.Round 27.41 to one decimal place. =
  7. 7.Round 27.69 to one decimal place. =
  8. 8.Round 80191 to the nearest ten.
  9. 9.Round 25180 to the nearest thousand.
  10. 10.Which is closest to 303 × 82? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000
  11. 11.Which is closest to 804 × 79? (Round each number first.) (a) 64000 (b) 640000 (c) 6400 (d) 128000
  12. 12.Which is closest to 795 + 796 + 802? (a) 2600 (b) 2300 (c) 2400 (d) 2500
  13. 13.Which is closest to 4507 ÷ 51? (a) 900 (b) 45 (c) 90 (d) 180
  14. 14.Round 85.32 to one decimal place. =
  15. 15.Which is closest to 297 + 395 + 896? (a) 1600 (b) 1800 (c) 1700 (d) 1500
  16. 16.Which is closest to 300 × 41? (Round each number first.) (a) 24000 (b) 120000 (c) 1200 (d) 12000
  17. 17.Round 12.79 to one decimal place. =
  18. 18.Which is closest to 1608 ÷ 19? (a) 40 (b) 160 (c) 80 (d) 800
  19. 19.Which is closest to 504 × 19? (Round each number first.) (a) 20000 (b) 1000 (c) 10000 (d) 100000
  20. 20.Round 40.64 to one decimal place. =
  21. 21.Which is closest to 603 + 502 + 900? (a) 2100 (b) 2000 (c) 1900 (d) 2200
  22. 22.Which is closest to 297 + 904 + 805? (a) 2000 (b) 2100 (c) 2200 (d) 1900
  23. 23.Which is closest to 596 ÷ 31? (a) 40 (b) 200 (c) 20 (d) 10
  24. 24.Which is closest to 502 × 61? (Round each number first.) (a) 30000 (b) 300000 (c) 3000 (d) 60000
  25. 25.Which is closest to 299 + 603 + 701? (a) 1500 (b) 1600 (c) 1800 (d) 1700
  26. 26.Which is closest to 698 + 700 + 896? (a) 2300 (b) 2500 (c) 2200 (d) 2400
  27. 27.Which is closest to 700 × 91? (Round each number first.) (a) 63000 (b) 630000 (c) 126000 (d) 6300
  28. 28.Round 66569 to the nearest ten.
  29. 29.Which is closest to 896 × 52? (Round each number first.) (a) 90000 (b) 450000 (c) 4500 (d) 45000
  30. 30.Round 29.79 to one decimal place. =
  31. 31.Round 15.89 to one decimal place. =
  32. 32.Which is closest to 204 + 297 + 705? (a) 1400 (b) 1100 (c) 1300 (d) 1200
  33. 33.Round 91.81 to one decimal place. =
  34. 34.Which is closest to 2091 ÷ 29? (a) 140 (b) 70 (c) 700 (d) 35
  35. 35.Which is closest to 303 × 92? (Round each number first.) (a) 2700 (b) 54000 (c) 27000 (d) 270000
  36. 36.Round 63.79 to one decimal place. =
  37. 37.Which is closest to 504 × 18? (Round each number first.) (a) 1000 (b) 20000 (c) 100000 (d) 10000
  38. 38.Round 93.41 to one decimal place. =
  39. 39.Which is closest to 303 + 297 + 799? (a) 1600 (b) 1300 (c) 1500 (d) 1400
  40. 40.Round 11.73 to one decimal place. =

Answer key

  1. 72000
  2. 36000
  3. 900
  4. 27000
  5. 54000
  6. 27.4
  7. 27.7
  8. 80190
  9. 25000
  10. 24000
  11. 64000
  12. 2400
  13. 90
  14. 85.3
  15. 1600
  16. 12000
  17. 12.8
  18. 80
  19. 10000
  20. 40.6
  21. 2000
  22. 2000
  23. 20
  24. 30000
  25. 1600
  26. 2300
  27. 63000
  28. 66570
  29. 45000
  30. 29.8
  31. 15.9
  32. 1200
  33. 91.8
  34. 70
  35. 27000
  36. 63.8
  37. 10000
  38. 93.4
  39. 1400
  40. 11.7

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