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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 55 · 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 1992 ÷ 49? (a) 20 (b) 40 (c) 80 (d) 400
  2. 2.Which is closest to 802 + 595 + 403? (a) 1800 (b) 1900 (c) 1700 (d) 2000
  3. 3.Which is closest to 1494 ÷ 51? (a) 60 (b) 30 (c) 15 (d) 300
  4. 4.Round 1978 to the nearest ten.
  5. 5.Round 98.39 to one decimal place. =
  6. 6.Which is closest to 800 ÷ 39? (a) 10 (b) 40 (c) 20 (d) 200
  7. 7.Round 84.32 to one decimal place. =
  8. 8.Which is closest to 97 + 495 + 800? (a) 1600 (b) 1300 (c) 1500 (d) 1400
  9. 9.Which is closest to 597 × 41? (Round each number first.) (a) 240000 (b) 2400 (c) 24000 (d) 48000
  10. 10.Round 92.87 to one decimal place. =
  11. 11.Round 27.87 to one decimal place. =
  12. 12.Round 37736 to the nearest thousand.
  13. 13.Round 77.86 to one decimal place. =
  14. 14.Which is closest to 2491 ÷ 51? (a) 25 (b) 50 (c) 100 (d) 500
  15. 15.Round 80254 to the nearest thousand.
  16. 16.Which is closest to 299 × 90? (Round each number first.) (a) 54000 (b) 270000 (c) 27000 (d) 2700
  17. 17.Which is closest to 893 ÷ 29? (a) 300 (b) 30 (c) 15 (d) 60
  18. 18.Which is closest to 796 + 205 + 396? (a) 1500 (b) 1400 (c) 1600 (d) 1300
  19. 19.Round 85.36 to one decimal place. =
  20. 20.Which is closest to 197 + 204 + 704? (a) 1200 (b) 1100 (c) 1300 (d) 1000
  21. 21.Which is closest to 701 + 98 + 305? (a) 1000 (b) 1200 (c) 1300 (d) 1100
  22. 22.Which is closest to 199 × 18? (Round each number first.) (a) 400 (b) 40000 (c) 4000 (d) 8000
  23. 23.Round 6717 to the nearest ten.
  24. 24.Round 11.83 to one decimal place. =
  25. 25.Which is closest to 302 × 71? (Round each number first.) (a) 210000 (b) 21000 (c) 42000 (d) 2100
  26. 26.Which is closest to 601 + 502 + 500? (a) 1500 (b) 1700 (c) 1800 (d) 1600
  27. 27.Round 88.51 to one decimal place. =
  28. 28.Which is closest to 197 × 28? (Round each number first.) (a) 600 (b) 12000 (c) 6000 (d) 60000
  29. 29.Round 52911 to the nearest ten.
  30. 30.Round 82.33 to one decimal place. =
  31. 31.Which is closest to 1496 ÷ 49? (a) 30 (b) 300 (c) 15 (d) 60
  32. 32.Round 14.52 to one decimal place. =
  33. 33.Which is closest to 298 + 500 + 398? (a) 1300 (b) 1400 (c) 1100 (d) 1200
  34. 34.Which is closest to 196 + 897 + 497? (a) 1800 (b) 1700 (c) 1500 (d) 1600
  35. 35.Which is closest to 607 ÷ 31? (a) 200 (b) 10 (c) 40 (d) 20
  36. 36.Which is closest to 2007 ÷ 39? (a) 25 (b) 100 (c) 500 (d) 50
  37. 37.Round 48.89 to one decimal place. =
  38. 38.Round 74977 to the nearest thousand.
  39. 39.Round 30.38 to one decimal place. =
  40. 40.Which is closest to 396 × 31? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200

Answer key

  1. 40
  2. 1800
  3. 30
  4. 1980
  5. 98.4
  6. 20
  7. 84.3
  8. 1400
  9. 24000
  10. 92.9
  11. 27.9
  12. 38000
  13. 77.9
  14. 50
  15. 80000
  16. 27000
  17. 30
  18. 1400
  19. 85.4
  20. 1100
  21. 1100
  22. 4000
  23. 6720
  24. 11.8
  25. 21000
  26. 1600
  27. 88.5
  28. 6000
  29. 52910
  30. 82.3
  31. 30
  32. 14.5
  33. 1200
  34. 1600
  35. 20
  36. 50
  37. 48.9
  38. 75000
  39. 30.4
  40. 12000

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