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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 643 · 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 19.39 to one decimal place. =
  2. 2.Which is closest to 298 × 28? (Round each number first.) (a) 9000 (b) 18000 (c) 90000 (d) 900
  3. 3.Round 14.54 to one decimal place. =
  4. 4.Which is closest to 496 × 88? (Round each number first.) (a) 45000 (b) 4500 (c) 90000 (d) 450000
  5. 5.Which is closest to 804 ÷ 39? (a) 40 (b) 200 (c) 10 (d) 20
  6. 6.Round 11719 to the nearest thousand.
  7. 7.Round 65271 to the nearest hundred.
  8. 8.Which is closest to 302 × 90? (Round each number first.) (a) 2700 (b) 27000 (c) 54000 (d) 270000
  9. 9.Round 19896 to the nearest ten.
  10. 10.Which is closest to 903 × 60? (Round each number first.) (a) 54000 (b) 540000 (c) 108000 (d) 5400
  11. 11.Which is closest to 3496 ÷ 51? (a) 700 (b) 35 (c) 140 (d) 70
  12. 12.Which is closest to 1005 ÷ 49? (a) 10 (b) 200 (c) 40 (d) 20
  13. 13.Round 41.93 to one decimal place. =
  14. 14.Which is closest to 398 × 38? (Round each number first.) (a) 32000 (b) 160000 (c) 1600 (d) 16000
  15. 15.Which is closest to 298 + 295 + 95? (a) 900 (b) 600 (c) 700 (d) 800
  16. 16.Round 28693 to the nearest hundred.
  17. 17.Which is closest to 298 × 81? (Round each number first.) (a) 2400 (b) 48000 (c) 24000 (d) 240000
  18. 18.Which is closest to 805 + 505 + 299? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  19. 19.Which is closest to 204 × 78? (Round each number first.) (a) 1600 (b) 32000 (c) 16000 (d) 160000
  20. 20.Which is closest to 797 × 58? (Round each number first.) (a) 480000 (b) 4800 (c) 96000 (d) 48000
  21. 21.Round 98.33 to one decimal place. =
  22. 22.Round 63.23 to one decimal place. =
  23. 23.Which is closest to 2106 ÷ 29? (a) 140 (b) 700 (c) 35 (d) 70
  24. 24.Which is closest to 1403 ÷ 21? (a) 35 (b) 700 (c) 70 (d) 140
  25. 25.Which is closest to 204 × 79? (Round each number first.) (a) 160000 (b) 1600 (c) 32000 (d) 16000
  26. 26.Round 13.14 to one decimal place. =
  27. 27.Which is closest to 395 + 96 + 201? (a) 800 (b) 700 (c) 600 (d) 900
  28. 28.Round 10.68 to one decimal place. =
  29. 29.Which is closest to 897 + 197 + 495? (a) 1500 (b) 1600 (c) 1800 (d) 1700
  30. 30.Which is closest to 2101 ÷ 29? (a) 70 (b) 700 (c) 140 (d) 35
  31. 31.Round 58790 to the nearest thousand.
  32. 32.Round 94.56 to one decimal place. =
  33. 33.Round 64.86 to one decimal place. =
  34. 34.Which is closest to 96 + 197 + 104? (a) 600 (b) 300 (c) 400 (d) 500
  35. 35.Which is closest to 97 + 395 + 796? (a) 1400 (b) 1300 (c) 1500 (d) 1200
  36. 36.Round 28.84 to one decimal place. =
  37. 37.Which is closest to 2407 ÷ 39? (a) 30 (b) 120 (c) 60 (d) 600
  38. 38.Round 7687 to the nearest thousand.
  39. 39.Round 45.79 to one decimal place. =
  40. 40.Round 78.79 to one decimal place. =

Answer key

  1. 19.4
  2. 9000
  3. 14.5
  4. 45000
  5. 20
  6. 12000
  7. 65300
  8. 27000
  9. 19900
  10. 54000
  11. 70
  12. 20
  13. 41.9
  14. 16000
  15. 700
  16. 28700
  17. 24000
  18. 1600
  19. 16000
  20. 48000
  21. 98.3
  22. 63.2
  23. 70
  24. 70
  25. 16000
  26. 13.1
  27. 700
  28. 10.7
  29. 1600
  30. 70
  31. 59000
  32. 94.6
  33. 64.9
  34. 400
  35. 1300
  36. 28.8
  37. 60
  38. 8000
  39. 45.8
  40. 78.8

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