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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 219 · 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 898 × 49? (Round each number first.) (a) 450000 (b) 4500 (c) 90000 (d) 45000
  2. 2.Which is closest to 403 × 92? (Round each number first.) (a) 3600 (b) 360000 (c) 72000 (d) 36000
  3. 3.Which is closest to 596 + 104 + 405? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  4. 4.Which is closest to 403 ÷ 21? (a) 200 (b) 20 (c) 10 (d) 40
  5. 5.Which is closest to 599 × 31? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  6. 6.Which is closest to 801 × 78? (Round each number first.) (a) 640000 (b) 6400 (c) 64000 (d) 128000
  7. 7.Which is closest to 605 + 396 + 95? (a) 1000 (b) 1100 (c) 1300 (d) 1200
  8. 8.Which is closest to 304 + 599 + 695? (a) 1600 (b) 1500 (c) 1700 (d) 1800
  9. 9.Round 34.09 to one decimal place. =
  10. 10.Round 47.44 to one decimal place. =
  11. 11.Round 82095 to the nearest thousand.
  12. 12.Which is closest to 3492 ÷ 49? (a) 140 (b) 70 (c) 35 (d) 700
  13. 13.Which is closest to 1494 ÷ 51? (a) 15 (b) 300 (c) 60 (d) 30
  14. 14.Round 70.66 to one decimal place. =
  15. 15.Which is closest to 1500 ÷ 49? (a) 30 (b) 15 (c) 60 (d) 300
  16. 16.Round 97.44 to one decimal place. =
  17. 17.Round 19.64 to one decimal place. =
  18. 18.Which is closest to 197 + 302 + 398? (a) 800 (b) 1000 (c) 1100 (d) 900
  19. 19.Which is closest to 903 × 48? (Round each number first.) (a) 90000 (b) 4500 (c) 450000 (d) 45000
  20. 20.Round 77.31 to one decimal place. =
  21. 21.Round 72606 to the nearest ten.
  22. 22.Which is closest to 698 × 19? (Round each number first.) (a) 14000 (b) 140000 (c) 28000 (d) 1400
  23. 23.Which is closest to 702 × 19? (Round each number first.) (a) 28000 (b) 1400 (c) 14000 (d) 140000
  24. 24.Round 13690 to the nearest thousand.
  25. 25.Round 42787 to the nearest hundred.
  26. 26.Which is closest to 304 × 80? (Round each number first.) (a) 48000 (b) 240000 (c) 24000 (d) 2400
  27. 27.Which is closest to 198 × 32? (Round each number first.) (a) 60000 (b) 600 (c) 12000 (d) 6000
  28. 28.Which is closest to 904 × 22? (Round each number first.) (a) 36000 (b) 180000 (c) 18000 (d) 1800
  29. 29.Which is closest to 197 + 201 + 605? (a) 900 (b) 1000 (c) 1100 (d) 1200
  30. 30.Which is closest to 897 + 796 + 398? (a) 2200 (b) 2300 (c) 2000 (d) 2100
  31. 31.Which is closest to 199 + 499 + 499? (a) 1200 (b) 1400 (c) 1100 (d) 1300
  32. 32.Round 59326 to the nearest thousand.
  33. 33.Round 8309 to the nearest hundred.
  34. 34.Round 62.44 to one decimal place. =
  35. 35.Which is closest to 701 × 18? (Round each number first.) (a) 140000 (b) 14000 (c) 28000 (d) 1400
  36. 36.Round 27460 to the nearest thousand.
  37. 37.Round 99.34 to one decimal place. =
  38. 38.Which is closest to 98 + 497 + 205? (a) 900 (b) 800 (c) 1000 (d) 700
  39. 39.Round 48056 to the nearest hundred.
  40. 40.Round 10482 to the nearest thousand.

Answer key

  1. 45000
  2. 36000
  3. 1100
  4. 20
  5. 18000
  6. 64000
  7. 1100
  8. 1600
  9. 34.1
  10. 47.4
  11. 82000
  12. 70
  13. 30
  14. 70.7
  15. 30
  16. 97.4
  17. 19.6
  18. 900
  19. 45000
  20. 77.3
  21. 72610
  22. 14000
  23. 14000
  24. 14000
  25. 42800
  26. 24000
  27. 6000
  28. 18000
  29. 1000
  30. 2100
  31. 1200
  32. 59000
  33. 8300
  34. 62.4
  35. 14000
  36. 27000
  37. 99.3
  38. 800
  39. 48100
  40. 10000

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