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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 185 · 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 3206 ÷ 41? (a) 40 (b) 80 (c) 160 (d) 800
  2. 2.Which is closest to 200 + 799 + 604? (a) 1800 (b) 1700 (c) 1500 (d) 1600
  3. 3.Round 34007 to the nearest hundred.
  4. 4.Which is closest to 398 × 68? (Round each number first.) (a) 56000 (b) 2800 (c) 28000 (d) 280000
  5. 5.Which is closest to 197 + 297 + 300? (a) 900 (b) 700 (c) 800 (d) 1000
  6. 6.Which is closest to 199 × 20? (Round each number first.) (a) 8000 (b) 400 (c) 40000 (d) 4000
  7. 7.Which is closest to 1794 ÷ 29? (a) 30 (b) 120 (c) 60 (d) 600
  8. 8.Round 86.72 to one decimal place. =
  9. 9.Which is closest to 198 × 78? (Round each number first.) (a) 16000 (b) 160000 (c) 32000 (d) 1600
  10. 10.Which is closest to 1794 ÷ 19? (a) 900 (b) 90 (c) 45 (d) 180
  11. 11.Which is closest to 602 × 19? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  12. 12.Which is closest to 701 × 31? (Round each number first.) (a) 2100 (b) 42000 (c) 21000 (d) 210000
  13. 13.Which is closest to 297 × 30? (Round each number first.) (a) 900 (b) 18000 (c) 9000 (d) 90000
  14. 14.Which is closest to 204 + 705 + 701? (a) 1500 (b) 1600 (c) 1700 (d) 1800
  15. 15.Round 41.53 to one decimal place. =
  16. 16.Which is closest to 900 × 59? (Round each number first.) (a) 5400 (b) 108000 (c) 540000 (d) 54000
  17. 17.Which is closest to 795 + 804 + 104? (a) 1900 (b) 1700 (c) 1800 (d) 1600
  18. 18.Which is closest to 795 + 696 + 699? (a) 2300 (b) 2200 (c) 2400 (d) 2100
  19. 19.Round 19.62 to one decimal place. =
  20. 20.Round 38514 to the nearest ten.
  21. 21.Which is closest to 2697 ÷ 29? (a) 900 (b) 45 (c) 90 (d) 180
  22. 22.Which is closest to 798 + 99 + 604? (a) 1700 (b) 1400 (c) 1500 (d) 1600
  23. 23.Round 2393 to the nearest ten.
  24. 24.Round 16.66 to one decimal place. =
  25. 25.Which is closest to 303 + 204 + 600? (a) 1200 (b) 1100 (c) 1300 (d) 1000
  26. 26.Which is closest to 2004 ÷ 51? (a) 40 (b) 20 (c) 80 (d) 400
  27. 27.Round 99.08 to one decimal place. =
  28. 28.Which is closest to 391 ÷ 21? (a) 10 (b) 200 (c) 20 (d) 40
  29. 29.Which is closest to 2393 ÷ 29? (a) 40 (b) 800 (c) 80 (d) 160
  30. 30.Round 77447 to the nearest ten.
  31. 31.Which is closest to 501 × 82? (Round each number first.) (a) 4000 (b) 400000 (c) 80000 (d) 40000
  32. 32.Which is closest to 697 × 20? (Round each number first.) (a) 14000 (b) 28000 (c) 1400 (d) 140000
  33. 33.Round 34617 to the nearest hundred.
  34. 34.Which is closest to 204 × 88? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  35. 35.Which is closest to 2496 ÷ 49? (a) 100 (b) 50 (c) 25 (d) 500
  36. 36.Which is closest to 2398 ÷ 39? (a) 30 (b) 600 (c) 60 (d) 120
  37. 37.Which is closest to 797 × 22? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
  38. 38.Which is closest to 794 ÷ 41? (a) 40 (b) 20 (c) 10 (d) 200
  39. 39.Which is closest to 893 ÷ 29? (a) 15 (b) 30 (c) 300 (d) 60
  40. 40.Which is closest to 197 × 48? (Round each number first.) (a) 1000 (b) 20000 (c) 100000 (d) 10000

Answer key

  1. 80
  2. 1600
  3. 34000
  4. 28000
  5. 800
  6. 4000
  7. 60
  8. 86.7
  9. 16000
  10. 90
  11. 12000
  12. 21000
  13. 9000
  14. 1600
  15. 41.5
  16. 54000
  17. 1700
  18. 2200
  19. 19.6
  20. 38510
  21. 90
  22. 1500
  23. 2390
  24. 16.7
  25. 1100
  26. 40
  27. 99.1
  28. 20
  29. 80
  30. 77450
  31. 40000
  32. 14000
  33. 34600
  34. 18000
  35. 50
  36. 60
  37. 16000
  38. 20
  39. 30
  40. 10000

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