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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 196 · 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 394 ÷ 21? (a) 200 (b) 40 (c) 10 (d) 20
  2. 2.Round 73417 to the nearest thousand.
  3. 3.Round 94.31 to one decimal place. =
  4. 4.Round 53903 to the nearest ten.
  5. 5.Round 7083 to the nearest ten.
  6. 6.Which is closest to 796 + 204 + 295? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  7. 7.Which is closest to 699 + 797 + 196? (a) 1700 (b) 1600 (c) 1900 (d) 1800
  8. 8.Which is closest to 1492 ÷ 31? (a) 100 (b) 25 (c) 50 (d) 500
  9. 9.Round 27.56 to one decimal place. =
  10. 10.Round 66.08 to one decimal place. =
  11. 11.Round 49.33 to one decimal place. =
  12. 12.Which is closest to 205 + 96 + 398? (a) 800 (b) 900 (c) 700 (d) 600
  13. 13.Which is closest to 1505 ÷ 31? (a) 500 (b) 100 (c) 25 (d) 50
  14. 14.Round 3604 to the nearest hundred.
  15. 15.Round 54654 to the nearest hundred.
  16. 16.Round 46455 to the nearest thousand.
  17. 17.Round 21.87 to one decimal place. =
  18. 18.Which is closest to 600 × 22? (Round each number first.) (a) 1200 (b) 12000 (c) 120000 (d) 24000
  19. 19.Which is closest to 204 × 92? (Round each number first.) (a) 18000 (b) 180000 (c) 1800 (d) 36000
  20. 20.Which is closest to 999 ÷ 49? (a) 200 (b) 10 (c) 20 (d) 40
  21. 21.Which is closest to 1593 ÷ 19? (a) 800 (b) 40 (c) 160 (d) 80
  22. 22.Round 22.79 to one decimal place. =
  23. 23.Round 27893 to the nearest hundred.
  24. 24.Which is closest to 396 + 903 + 404? (a) 1800 (b) 1900 (c) 1700 (d) 1600
  25. 25.Which is closest to 1498 ÷ 31? (a) 500 (b) 50 (c) 100 (d) 25
  26. 26.Which is closest to 199 + 900 + 103? (a) 1100 (b) 1400 (c) 1200 (d) 1300
  27. 27.Round 17776 to the nearest thousand.
  28. 28.Round 73.08 to one decimal place. =
  29. 29.Which is closest to 199 × 39? (Round each number first.) (a) 16000 (b) 800 (c) 80000 (d) 8000
  30. 30.Which is closest to 1596 ÷ 21? (a) 160 (b) 80 (c) 40 (d) 800
  31. 31.Round 17078 to the nearest ten.
  32. 32.Which is closest to 301 × 18? (Round each number first.) (a) 60000 (b) 600 (c) 12000 (d) 6000
  33. 33.Which is closest to 904 × 51? (Round each number first.) (a) 45000 (b) 90000 (c) 4500 (d) 450000
  34. 34.Round 65.78 to one decimal place. =
  35. 35.Which is closest to 299 × 88? (Round each number first.) (a) 27000 (b) 2700 (c) 54000 (d) 270000
  36. 36.Round 44.49 to one decimal place. =
  37. 37.Which is closest to 602 × 32? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  38. 38.Which is closest to 902 × 22? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  39. 39.Round 50979 to the nearest thousand.
  40. 40.Which is closest to 598 × 61? (Round each number first.) (a) 72000 (b) 36000 (c) 3600 (d) 360000

Answer key

  1. 20
  2. 73000
  3. 94.3
  4. 53900
  5. 7080
  6. 1300
  7. 1700
  8. 50
  9. 27.6
  10. 66.1
  11. 49.3
  12. 700
  13. 50
  14. 3600
  15. 54700
  16. 46000
  17. 21.9
  18. 12000
  19. 18000
  20. 20
  21. 80
  22. 22.8
  23. 27900
  24. 1700
  25. 50
  26. 1200
  27. 18000
  28. 73.1
  29. 8000
  30. 80
  31. 17080
  32. 6000
  33. 45000
  34. 65.8
  35. 27000
  36. 44.5
  37. 18000
  38. 18000
  39. 51000
  40. 36000

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