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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 252 · 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 605 + 796 + 595? (a) 2200 (b) 2100 (c) 1900 (d) 2000
  2. 2.Round 51632 to the nearest thousand.
  3. 3.Which is closest to 298 × 78? (Round each number first.) (a) 240000 (b) 24000 (c) 2400 (d) 48000
  4. 4.Which is closest to 1604 ÷ 19? (a) 160 (b) 800 (c) 80 (d) 40
  5. 5.Which is closest to 796 × 18? (Round each number first.) (a) 16000 (b) 1600 (c) 160000 (d) 32000
  6. 6.Which is closest to 3193 ÷ 41? (a) 160 (b) 800 (c) 80 (d) 40
  7. 7.Round 16655 to the nearest thousand.
  8. 8.Which is closest to 102 + 703 + 703? (a) 1600 (b) 1700 (c) 1500 (d) 1400
  9. 9.Which is closest to 904 + 502 + 295? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  10. 10.Which is closest to 1792 ÷ 29? (a) 600 (b) 30 (c) 120 (d) 60
  11. 11.Which is closest to 1009 ÷ 19? (a) 100 (b) 50 (c) 500 (d) 25
  12. 12.Which is closest to 2409 ÷ 29? (a) 40 (b) 80 (c) 160 (d) 800
  13. 13.Round 28819 to the nearest thousand.
  14. 14.Which is closest to 105 + 705 + 105? (a) 1100 (b) 800 (c) 900 (d) 1000
  15. 15.Round 24.42 to one decimal place. =
  16. 16.Round 48761 to the nearest ten.
  17. 17.Round 68.22 to one decimal place. =
  18. 18.Which is closest to 95 + 795 + 899? (a) 2000 (b) 1700 (c) 1900 (d) 1800
  19. 19.Which is closest to 501 × 88? (Round each number first.) (a) 45000 (b) 90000 (c) 450000 (d) 4500
  20. 20.Round 75.79 to one decimal place. =
  21. 21.Which is closest to 204 + 400 + 302? (a) 800 (b) 1100 (c) 900 (d) 1000
  22. 22.Which is closest to 1802 ÷ 21? (a) 45 (b) 180 (c) 900 (d) 90
  23. 23.Which is closest to 601 ÷ 21? (a) 60 (b) 300 (c) 15 (d) 30
  24. 24.Round 28.88 to one decimal place. =
  25. 25.Which is closest to 602 + 898 + 695? (a) 2200 (b) 2100 (c) 2400 (d) 2300
  26. 26.Which is closest to 604 + 904 + 105? (a) 1800 (b) 1700 (c) 1500 (d) 1600
  27. 27.Round 16634 to the nearest thousand.
  28. 28.Round 55.14 to one decimal place. =
  29. 29.Which is closest to 1593 ÷ 21? (a) 800 (b) 80 (c) 160 (d) 40
  30. 30.Round 97.51 to one decimal place. =
  31. 31.Which is closest to 803 + 801 + 300? (a) 2100 (b) 2000 (c) 1800 (d) 1900
  32. 32.Which is closest to 605 + 103 + 899? (a) 1500 (b) 1700 (c) 1800 (d) 1600
  33. 33.Which is closest to 204 × 90? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
  34. 34.Which is closest to 3007 ÷ 51? (a) 600 (b) 60 (c) 30 (d) 120
  35. 35.Round 31922 to the nearest hundred.
  36. 36.Which is closest to 2505 ÷ 49? (a) 100 (b) 50 (c) 25 (d) 500
  37. 37.Round 94142 to the nearest ten.
  38. 38.Which is closest to 97 + 702 + 400? (a) 1300 (b) 1400 (c) 1100 (d) 1200
  39. 39.Round 14931 to the nearest hundred.
  40. 40.Round 28546 to the nearest thousand.

Answer key

  1. 2000
  2. 52000
  3. 24000
  4. 80
  5. 16000
  6. 80
  7. 17000
  8. 1500
  9. 1700
  10. 60
  11. 50
  12. 80
  13. 29000
  14. 900
  15. 24.4
  16. 48760
  17. 68.2
  18. 1800
  19. 45000
  20. 75.8
  21. 900
  22. 90
  23. 30
  24. 28.9
  25. 2200
  26. 1600
  27. 17000
  28. 55.1
  29. 80
  30. 97.5
  31. 1900
  32. 1600
  33. 18000
  34. 60
  35. 31900
  36. 50
  37. 94140
  38. 1200
  39. 14900
  40. 29000

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