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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 782 · 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 795 + 596 + 499? (a) 2000 (b) 1800 (c) 2100 (d) 1900
  2. 2.Which is closest to 204 + 202 + 204? (a) 800 (b) 600 (c) 700 (d) 500
  3. 3.Which is closest to 609 ÷ 31? (a) 10 (b) 40 (c) 20 (d) 200
  4. 4.Which is closest to 3600 ÷ 41? (a) 180 (b) 45 (c) 900 (d) 90
  5. 5.Which is closest to 1999 ÷ 39? (a) 500 (b) 100 (c) 25 (d) 50
  6. 6.Round 77.71 to one decimal place. =
  7. 7.Round 65307 to the nearest ten.
  8. 8.Which is closest to 105 + 501 + 800? (a) 1600 (b) 1500 (c) 1300 (d) 1400
  9. 9.Which is closest to 598 + 900 + 96? (a) 1700 (b) 1600 (c) 1800 (d) 1500
  10. 10.Round 25.47 to one decimal place. =
  11. 11.Round 87.24 to one decimal place. =
  12. 12.Which is closest to 204 + 898 + 801? (a) 2000 (b) 1800 (c) 2100 (d) 1900
  13. 13.Which is closest to 905 ÷ 29? (a) 30 (b) 15 (c) 300 (d) 60
  14. 14.Round 94039 to the nearest ten.
  15. 15.Which is closest to 699 + 96 + 603? (a) 1600 (b) 1500 (c) 1300 (d) 1400
  16. 16.Which is closest to 901 + 497 + 697? (a) 2300 (b) 2200 (c) 2100 (d) 2000
  17. 17.Which is closest to 905 ÷ 31? (a) 300 (b) 30 (c) 15 (d) 60
  18. 18.Which is closest to 99 + 904 + 703? (a) 1800 (b) 1700 (c) 1600 (d) 1900
  19. 19.Which is closest to 605 + 405 + 596? (a) 1700 (b) 1600 (c) 1500 (d) 1800
  20. 20.Round 76248 to the nearest hundred.
  21. 21.Round 82983 to the nearest thousand.
  22. 22.Round 16914 to the nearest ten.
  23. 23.Round 54.61 to one decimal place. =
  24. 24.Round 77699 to the nearest thousand.
  25. 25.Round 62879 to the nearest thousand.
  26. 26.Which is closest to 698 + 503 + 95? (a) 1300 (b) 1500 (c) 1400 (d) 1200
  27. 27.Which is closest to 2091 ÷ 31? (a) 35 (b) 140 (c) 70 (d) 700
  28. 28.Round 45127 to the nearest ten.
  29. 29.Which is closest to 2505 ÷ 51? (a) 500 (b) 50 (c) 25 (d) 100
  30. 30.Round 57716 to the nearest ten.
  31. 31.Which is closest to 996 ÷ 49? (a) 40 (b) 20 (c) 200 (d) 10
  32. 32.Round 13536 to the nearest thousand.
  33. 33.Round 66.69 to one decimal place. =
  34. 34.Which is closest to 204 × 60? (Round each number first.) (a) 1200 (b) 24000 (c) 12000 (d) 120000
  35. 35.Round 98536 to the nearest thousand.
  36. 36.Round 99.71 to one decimal place. =
  37. 37.Which is closest to 403 × 41? (Round each number first.) (a) 1600 (b) 16000 (c) 160000 (d) 32000
  38. 38.Which is closest to 1207 ÷ 41? (a) 60 (b) 15 (c) 300 (d) 30
  39. 39.Which is closest to 795 + 296 + 897? (a) 2200 (b) 1900 (c) 2100 (d) 2000
  40. 40.Which is closest to 800 × 58? (Round each number first.) (a) 4800 (b) 480000 (c) 96000 (d) 48000

Answer key

  1. 1900
  2. 600
  3. 20
  4. 90
  5. 50
  6. 77.7
  7. 65310
  8. 1400
  9. 1600
  10. 25.5
  11. 87.2
  12. 1900
  13. 30
  14. 94040
  15. 1400
  16. 2100
  17. 30
  18. 1700
  19. 1600
  20. 76200
  21. 83000
  22. 16910
  23. 54.6
  24. 78000
  25. 63000
  26. 1300
  27. 70
  28. 45130
  29. 50
  30. 57720
  31. 20
  32. 14000
  33. 66.7
  34. 12000
  35. 99000
  36. 99.7
  37. 16000
  38. 30
  39. 2000
  40. 48000

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