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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 665 · 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 81.11 to one decimal place. =
  2. 2.Which is closest to 902 × 81? (Round each number first.) (a) 72000 (b) 720000 (c) 144000 (d) 7200
  3. 3.Round 45101 to the nearest thousand.
  4. 4.Round 84.23 to one decimal place. =
  5. 5.Round 31065 to the nearest thousand.
  6. 6.Round 14.69 to one decimal place. =
  7. 7.Round 42.44 to one decimal place. =
  8. 8.Which is closest to 804 × 20? (Round each number first.) (a) 1600 (b) 16000 (c) 160000 (d) 32000
  9. 9.Which is closest to 698 × 62? (Round each number first.) (a) 4200 (b) 84000 (c) 420000 (d) 42000
  10. 10.Which is closest to 501 × 38? (Round each number first.) (a) 2000 (b) 40000 (c) 20000 (d) 200000
  11. 11.Round 47.62 to one decimal place. =
  12. 12.Round 29.92 to one decimal place. =
  13. 13.Which is closest to 595 + 901 + 204? (a) 1700 (b) 1900 (c) 1800 (d) 1600
  14. 14.Which is closest to 1792 ÷ 21? (a) 900 (b) 180 (c) 90 (d) 45
  15. 15.Which is closest to 796 + 696 + 199? (a) 1700 (b) 1900 (c) 1600 (d) 1800
  16. 16.Round 40.41 to one decimal place. =
  17. 17.Which is closest to 596 × 91? (Round each number first.) (a) 108000 (b) 5400 (c) 54000 (d) 540000
  18. 18.Round 85.52 to one decimal place. =
  19. 19.Which is closest to 295 + 795 + 404? (a) 1700 (b) 1500 (c) 1600 (d) 1400
  20. 20.Which is closest to 1206 ÷ 41? (a) 30 (b) 15 (c) 60 (d) 300
  21. 21.Which is closest to 500 + 203 + 798? (a) 1500 (b) 1700 (c) 1400 (d) 1600
  22. 22.Which is closest to 1392 ÷ 21? (a) 35 (b) 140 (c) 70 (d) 700
  23. 23.Which is closest to 799 × 49? (Round each number first.) (a) 400000 (b) 40000 (c) 80000 (d) 4000
  24. 24.Which is closest to 398 × 90? (Round each number first.) (a) 3600 (b) 72000 (c) 36000 (d) 360000
  25. 25.Which is closest to 598 + 495 + 405? (a) 1600 (b) 1700 (c) 1400 (d) 1500
  26. 26.Which is closest to 1206 ÷ 29? (a) 80 (b) 20 (c) 400 (d) 40
  27. 27.Round 51.78 to one decimal place. =
  28. 28.Which is closest to 701 × 60? (Round each number first.) (a) 420000 (b) 84000 (c) 42000 (d) 4200
  29. 29.Which is closest to 902 × 68? (Round each number first.) (a) 63000 (b) 630000 (c) 6300 (d) 126000
  30. 30.Which is closest to 498 + 202 + 195? (a) 1000 (b) 800 (c) 900 (d) 1100
  31. 31.Which is closest to 808 ÷ 19? (a) 80 (b) 40 (c) 400 (d) 20
  32. 32.Which is closest to 299 + 905 + 801? (a) 2100 (b) 2200 (c) 1900 (d) 2000
  33. 33.Round 26.79 to one decimal place. =
  34. 34.Which is closest to 809 ÷ 41? (a) 40 (b) 10 (c) 200 (d) 20
  35. 35.Round 21446 to the nearest ten.
  36. 36.Round 60.08 to one decimal place. =
  37. 37.Which is closest to 902 ÷ 31? (a) 30 (b) 60 (c) 15 (d) 300
  38. 38.Which is closest to 2002 ÷ 49? (a) 80 (b) 40 (c) 20 (d) 400
  39. 39.Which is closest to 1992 ÷ 41? (a) 100 (b) 500 (c) 50 (d) 25
  40. 40.Which is closest to 1006 ÷ 51? (a) 40 (b) 10 (c) 20 (d) 200

Answer key

  1. 81.1
  2. 72000
  3. 45000
  4. 84.2
  5. 31000
  6. 14.7
  7. 42.4
  8. 16000
  9. 42000
  10. 20000
  11. 47.6
  12. 29.9
  13. 1700
  14. 90
  15. 1700
  16. 40.4
  17. 54000
  18. 85.5
  19. 1500
  20. 30
  21. 1500
  22. 70
  23. 40000
  24. 36000
  25. 1500
  26. 40
  27. 51.8
  28. 42000
  29. 63000
  30. 900
  31. 40
  32. 2000
  33. 26.8
  34. 20
  35. 21450
  36. 60.1
  37. 30
  38. 40
  39. 50
  40. 20

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