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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 28 · 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 798 × 19? (Round each number first.) (a) 32000 (b) 16000 (c) 160000 (d) 1600
  2. 2.Which is closest to 796 + 495 + 505? (a) 1700 (b) 1900 (c) 1800 (d) 2000
  3. 3.Which is closest to 697 + 699 + 497? (a) 1800 (b) 2000 (c) 1900 (d) 2100
  4. 4.Round 11580 to the nearest thousand.
  5. 5.Which is closest to 2393 ÷ 41? (a) 600 (b) 30 (c) 60 (d) 120
  6. 6.Round 70.69 to one decimal place. =
  7. 7.Round 11849 to the nearest ten.
  8. 8.Which is closest to 3003 ÷ 51? (a) 60 (b) 30 (c) 600 (d) 120
  9. 9.Which is closest to 200 × 18? (Round each number first.) (a) 8000 (b) 40000 (c) 400 (d) 4000
  10. 10.Which is closest to 409 ÷ 19? (a) 200 (b) 40 (c) 20 (d) 10
  11. 11.Round 80172 to the nearest ten.
  12. 12.Which is closest to 1394 ÷ 19? (a) 35 (b) 140 (c) 70 (d) 700
  13. 13.Round 86203 to the nearest thousand.
  14. 14.Round 53707 to the nearest thousand.
  15. 15.Which is closest to 804 × 19? (Round each number first.) (a) 1600 (b) 16000 (c) 160000 (d) 32000
  16. 16.Which is closest to 598 + 104 + 400? (a) 1200 (b) 1000 (c) 1100 (d) 1300
  17. 17.Which is closest to 800 × 92? (Round each number first.) (a) 144000 (b) 7200 (c) 72000 (d) 720000
  18. 18.Which is closest to 297 + 303 + 204? (a) 900 (b) 700 (c) 1000 (d) 800
  19. 19.Which is closest to 497 × 70? (Round each number first.) (a) 3500 (b) 35000 (c) 350000 (d) 70000
  20. 20.Which is closest to 503 × 68? (Round each number first.) (a) 70000 (b) 35000 (c) 350000 (d) 3500
  21. 21.Round 46.09 to one decimal place. =
  22. 22.Round 14.33 to one decimal place. =
  23. 23.Which is closest to 197 × 58? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  24. 24.Round 74.86 to one decimal place. =
  25. 25.Which is closest to 198 × 21? (Round each number first.) (a) 400 (b) 4000 (c) 40000 (d) 8000
  26. 26.Round 27.79 to one decimal place. =
  27. 27.Which is closest to 700 × 58? (Round each number first.) (a) 84000 (b) 4200 (c) 420000 (d) 42000
  28. 28.Which is closest to 1400 ÷ 21? (a) 140 (b) 700 (c) 35 (d) 70
  29. 29.Which is closest to 3208 ÷ 41? (a) 800 (b) 40 (c) 80 (d) 160
  30. 30.Round 13.71 to one decimal place. =
  31. 31.Which is closest to 598 + 196 + 598? (a) 1400 (b) 1600 (c) 1300 (d) 1500
  32. 32.Which is closest to 2502 ÷ 51? (a) 50 (b) 100 (c) 25 (d) 500
  33. 33.Which is closest to 591 ÷ 31? (a) 40 (b) 200 (c) 20 (d) 10
  34. 34.Which is closest to 698 × 42? (Round each number first.) (a) 280000 (b) 56000 (c) 2800 (d) 28000
  35. 35.Which is closest to 701 + 505 + 298? (a) 1500 (b) 1700 (c) 1400 (d) 1600
  36. 36.Round 31.47 to one decimal place. =
  37. 37.Which is closest to 500 × 18? (Round each number first.) (a) 100000 (b) 20000 (c) 1000 (d) 10000
  38. 38.Round 36.68 to one decimal place. =
  39. 39.Which is closest to 798 × 59? (Round each number first.) (a) 96000 (b) 48000 (c) 480000 (d) 4800
  40. 40.Which is closest to 502 × 88? (Round each number first.) (a) 90000 (b) 45000 (c) 450000 (d) 4500

Answer key

  1. 16000
  2. 1800
  3. 1900
  4. 12000
  5. 60
  6. 70.7
  7. 11850
  8. 60
  9. 4000
  10. 20
  11. 80170
  12. 70
  13. 86000
  14. 54000
  15. 16000
  16. 1100
  17. 72000
  18. 800
  19. 35000
  20. 35000
  21. 46.1
  22. 14.3
  23. 12000
  24. 74.9
  25. 4000
  26. 27.8
  27. 42000
  28. 70
  29. 80
  30. 13.7
  31. 1400
  32. 50
  33. 20
  34. 28000
  35. 1500
  36. 31.5
  37. 10000
  38. 36.7
  39. 48000
  40. 45000

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