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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 603 · 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 38.82 to one decimal place. =
  2. 2.Round 66712 to the nearest thousand.
  3. 3.Which is closest to 802 × 48? (Round each number first.) (a) 40000 (b) 80000 (c) 400000 (d) 4000
  4. 4.Which is closest to 304 × 31? (Round each number first.) (a) 18000 (b) 9000 (c) 90000 (d) 900
  5. 5.Which is closest to 2695 ÷ 29? (a) 180 (b) 45 (c) 90 (d) 900
  6. 6.Which is closest to 701 × 50? (Round each number first.) (a) 350000 (b) 3500 (c) 35000 (d) 70000
  7. 7.Which is closest to 700 + 305 + 804? (a) 1800 (b) 1700 (c) 1900 (d) 2000
  8. 8.Which is closest to 804 + 495 + 596? (a) 2100 (b) 1900 (c) 2000 (d) 1800
  9. 9.Round 59871 to the nearest hundred.
  10. 10.Round 41.77 to one decimal place. =
  11. 11.Which is closest to 1595 ÷ 21? (a) 160 (b) 80 (c) 800 (d) 40
  12. 12.Which is closest to 198 × 79? (Round each number first.) (a) 16000 (b) 32000 (c) 160000 (d) 1600
  13. 13.Round 49.59 to one decimal place. =
  14. 14.Round 70.43 to one decimal place. =
  15. 15.Round 72.68 to one decimal place. =
  16. 16.Which is closest to 701 × 90? (Round each number first.) (a) 126000 (b) 63000 (c) 6300 (d) 630000
  17. 17.Which is closest to 401 × 70? (Round each number first.) (a) 28000 (b) 2800 (c) 56000 (d) 280000
  18. 18.Round 97.86 to one decimal place. =
  19. 19.Round 77.18 to one decimal place. =
  20. 20.Which is closest to 503 × 19? (Round each number first.) (a) 100000 (b) 1000 (c) 10000 (d) 20000
  21. 21.Round 53.61 to one decimal place. =
  22. 22.Round 69.36 to one decimal place. =
  23. 23.Which is closest to 699 × 20? (Round each number first.) (a) 14000 (b) 28000 (c) 140000 (d) 1400
  24. 24.Round 68.18 to one decimal place. =
  25. 25.Which is closest to 205 + 295 + 204? (a) 800 (b) 900 (c) 600 (d) 700
  26. 26.Which is closest to 903 × 50? (Round each number first.) (a) 4500 (b) 450000 (c) 90000 (d) 45000
  27. 27.Which is closest to 196 + 805 + 900? (a) 2000 (b) 2100 (c) 1800 (d) 1900
  28. 28.Round 24.56 to one decimal place. =
  29. 29.Which is closest to 403 + 205 + 396? (a) 900 (b) 1100 (c) 1200 (d) 1000
  30. 30.Round 83.63 to one decimal place. =
  31. 31.Which is closest to 304 + 201 + 99? (a) 600 (b) 700 (c) 800 (d) 500
  32. 32.Round 22.88 to one decimal place. =
  33. 33.Which is closest to 2403 ÷ 41? (a) 30 (b) 600 (c) 60 (d) 120
  34. 34.Round 14.32 to one decimal place. =
  35. 35.Round 64.38 to one decimal place. =
  36. 36.Which is closest to 197 × 18? (Round each number first.) (a) 4000 (b) 40000 (c) 400 (d) 8000
  37. 37.Round 43.43 to one decimal place. =
  38. 38.Which is closest to 305 + 501 + 600? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  39. 39.Which is closest to 3006 ÷ 49? (a) 120 (b) 600 (c) 60 (d) 30
  40. 40.Round 60.64 to one decimal place. =

Answer key

  1. 38.8
  2. 67000
  3. 40000
  4. 9000
  5. 90
  6. 35000
  7. 1800
  8. 1900
  9. 59900
  10. 41.8
  11. 80
  12. 16000
  13. 49.6
  14. 70.4
  15. 72.7
  16. 63000
  17. 28000
  18. 97.9
  19. 77.2
  20. 10000
  21. 53.6
  22. 69.4
  23. 14000
  24. 68.2
  25. 700
  26. 45000
  27. 1900
  28. 24.6
  29. 1000
  30. 83.6
  31. 600
  32. 22.9
  33. 60
  34. 14.3
  35. 64.4
  36. 4000
  37. 43.4
  38. 1400
  39. 60
  40. 60.6

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