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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 861 · 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 897 + 796 + 400? (a) 2100 (b) 2200 (c) 2000 (d) 2300
  2. 2.Round 67.86 to one decimal place. =
  3. 3.Round 58466 to the nearest ten.
  4. 4.Round 66.44 to one decimal place. =
  5. 5.Which is closest to 198 + 203 + 803? (a) 1300 (b) 1400 (c) 1100 (d) 1200
  6. 6.Which is closest to 1797 ÷ 19? (a) 90 (b) 900 (c) 180 (d) 45
  7. 7.Which is closest to 2003 ÷ 41? (a) 100 (b) 500 (c) 25 (d) 50
  8. 8.Round 45791 to the nearest thousand.
  9. 9.Which is closest to 698 × 50? (Round each number first.) (a) 350000 (b) 3500 (c) 35000 (d) 70000
  10. 10.Which is closest to 903 + 900 + 104? (a) 1900 (b) 2000 (c) 2100 (d) 1800
  11. 11.Which is closest to 897 × 69? (Round each number first.) (a) 63000 (b) 630000 (c) 6300 (d) 126000
  12. 12.Which is closest to 900 + 897 + 796? (a) 2600 (b) 2500 (c) 2700 (d) 2800
  13. 13.Round 72.73 to one decimal place. =
  14. 14.Which is closest to 899 + 104 + 396? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  15. 15.Round 20.49 to one decimal place. =
  16. 16.Round 34.18 to one decimal place. =
  17. 17.Which is closest to 1791 ÷ 29? (a) 600 (b) 120 (c) 60 (d) 30
  18. 18.Which is closest to 496 × 20? (Round each number first.) (a) 100000 (b) 10000 (c) 1000 (d) 20000
  19. 19.Round 14.78 to one decimal place. =
  20. 20.Round 32191 to the nearest thousand.
  21. 21.Round 39.68 to one decimal place. =
  22. 22.Which is closest to 592 ÷ 31? (a) 20 (b) 10 (c) 200 (d) 40
  23. 23.Which is closest to 196 × 79? (Round each number first.) (a) 16000 (b) 160000 (c) 32000 (d) 1600
  24. 24.Round 58.86 to one decimal place. =
  25. 25.Round 88.41 to one decimal place. =
  26. 26.Which is closest to 603 + 601 + 403? (a) 1600 (b) 1500 (c) 1700 (d) 1800
  27. 27.Round 16601 to the nearest ten.
  28. 28.Which is closest to 901 ÷ 31? (a) 30 (b) 15 (c) 60 (d) 300
  29. 29.Which is closest to 899 + 399 + 195? (a) 1400 (b) 1500 (c) 1600 (d) 1700
  30. 30.Which is closest to 407 ÷ 21? (a) 10 (b) 40 (c) 20 (d) 200
  31. 31.Round 99343 to the nearest ten.
  32. 32.Which is closest to 4501 ÷ 49? (a) 45 (b) 90 (c) 900 (d) 180
  33. 33.Which is closest to 802 ÷ 41? (a) 10 (b) 40 (c) 20 (d) 200
  34. 34.Which is closest to 404 × 88? (Round each number first.) (a) 3600 (b) 360000 (c) 36000 (d) 72000
  35. 35.Which is closest to 199 × 31? (Round each number first.) (a) 60000 (b) 12000 (c) 600 (d) 6000
  36. 36.Which is closest to 701 × 52? (Round each number first.) (a) 3500 (b) 35000 (c) 350000 (d) 70000
  37. 37.Round 57.88 to one decimal place. =
  38. 38.Which is closest to 601 + 900 + 198? (a) 1600 (b) 1800 (c) 1900 (d) 1700
  39. 39.Which is closest to 704 × 18? (Round each number first.) (a) 140000 (b) 28000 (c) 1400 (d) 14000
  40. 40.Which is closest to 1004 ÷ 51? (a) 10 (b) 40 (c) 200 (d) 20

Answer key

  1. 2100
  2. 67.9
  3. 58470
  4. 66.4
  5. 1200
  6. 90
  7. 50
  8. 46000
  9. 35000
  10. 1900
  11. 63000
  12. 2600
  13. 72.7
  14. 1400
  15. 20.5
  16. 34.2
  17. 60
  18. 10000
  19. 14.8
  20. 32000
  21. 39.7
  22. 20
  23. 16000
  24. 58.9
  25. 88.4
  26. 1600
  27. 16600
  28. 30
  29. 1500
  30. 20
  31. 99340
  32. 90
  33. 20
  34. 36000
  35. 6000
  36. 35000
  37. 57.9
  38. 1700
  39. 14000
  40. 20

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