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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 447 · 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 11.64 to one decimal place. =
  2. 2.Which is closest to 3201 ÷ 39? (a) 40 (b) 80 (c) 800 (d) 160
  3. 3.Which is closest to 904 + 199 + 198? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  4. 4.Which is closest to 801 + 805 + 199? (a) 1800 (b) 2000 (c) 1900 (d) 1700
  5. 5.Round 22.31 to one decimal place. =
  6. 6.Round 56021 to the nearest hundred.
  7. 7.Round 93937 to the nearest hundred.
  8. 8.Which is closest to 297 × 90? (Round each number first.) (a) 270000 (b) 27000 (c) 2700 (d) 54000
  9. 9.Round 74.76 to one decimal place. =
  10. 10.Which is closest to 3601 ÷ 41? (a) 900 (b) 45 (c) 180 (d) 90
  11. 11.Round 74032 to the nearest hundred.
  12. 12.Round 67.28 to one decimal place. =
  13. 13.Which is closest to 2092 ÷ 31? (a) 70 (b) 35 (c) 700 (d) 140
  14. 14.Which is closest to 898 + 98 + 702? (a) 1800 (b) 1700 (c) 1900 (d) 1600
  15. 15.Which is closest to 891 ÷ 29? (a) 60 (b) 300 (c) 30 (d) 15
  16. 16.Which is closest to 596 × 19? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200
  17. 17.Round 54.69 to one decimal place. =
  18. 18.Round 56.32 to one decimal place. =
  19. 19.Which is closest to 598 × 29? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  20. 20.Which is closest to 297 × 91? (Round each number first.) (a) 270000 (b) 54000 (c) 27000 (d) 2700
  21. 21.Round 14.07 to one decimal place. =
  22. 22.Round 50947 to the nearest hundred.
  23. 23.Which is closest to 396 + 805 + 602? (a) 1700 (b) 1900 (c) 1800 (d) 2000
  24. 24.Which is closest to 3198 ÷ 39? (a) 160 (b) 80 (c) 40 (d) 800
  25. 25.Round 62.58 to one decimal place. =
  26. 26.Which is closest to 602 × 28? (Round each number first.) (a) 18000 (b) 1800 (c) 36000 (d) 180000
  27. 27.Which is closest to 1805 ÷ 31? (a) 600 (b) 60 (c) 30 (d) 120
  28. 28.Which is closest to 902 × 31? (Round each number first.) (a) 2700 (b) 27000 (c) 270000 (d) 54000
  29. 29.Which is closest to 699 × 22? (Round each number first.) (a) 1400 (b) 14000 (c) 28000 (d) 140000
  30. 30.Which is closest to 3001 ÷ 51? (a) 120 (b) 30 (c) 600 (d) 60
  31. 31.Round 90197 to the nearest ten.
  32. 32.Round 20.47 to one decimal place. =
  33. 33.Round 87.16 to one decimal place. =
  34. 34.Which is closest to 501 × 60? (Round each number first.) (a) 60000 (b) 3000 (c) 30000 (d) 300000
  35. 35.Which is closest to 297 × 51? (Round each number first.) (a) 1500 (b) 150000 (c) 15000 (d) 30000
  36. 36.Which is closest to 598 × 91? (Round each number first.) (a) 54000 (b) 5400 (c) 540000 (d) 108000
  37. 37.Round 22028 to the nearest thousand.
  38. 38.Round 50156 to the nearest hundred.
  39. 39.Round 17.37 to one decimal place. =
  40. 40.Which is closest to 204 × 41? (Round each number first.) (a) 80000 (b) 800 (c) 16000 (d) 8000

Answer key

  1. 11.6
  2. 80
  3. 1300
  4. 1800
  5. 22.3
  6. 56000
  7. 93900
  8. 27000
  9. 74.8
  10. 90
  11. 74000
  12. 67.3
  13. 70
  14. 1700
  15. 30
  16. 12000
  17. 54.7
  18. 56.3
  19. 18000
  20. 27000
  21. 14.1
  22. 50900
  23. 1800
  24. 80
  25. 62.6
  26. 18000
  27. 60
  28. 27000
  29. 14000
  30. 60
  31. 90200
  32. 20.5
  33. 87.2
  34. 30000
  35. 15000
  36. 54000
  37. 22000
  38. 50200
  39. 17.4
  40. 8000

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