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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 161 · 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 595 ÷ 19? (a) 15 (b) 60 (c) 30 (d) 300
  2. 2.Which is closest to 501 + 301 + 204? (a) 1000 (b) 900 (c) 1100 (d) 1200
  3. 3.Round 31.84 to one decimal place. =
  4. 4.Round 85430 to the nearest hundred.
  5. 5.Which is closest to 2405 ÷ 31? (a) 80 (b) 40 (c) 160 (d) 800
  6. 6.Which is closest to 696 × 51? (Round each number first.) (a) 350000 (b) 70000 (c) 35000 (d) 3500
  7. 7.Which is closest to 897 × 89? (Round each number first.) (a) 81000 (b) 810000 (c) 8100 (d) 162000
  8. 8.Which is closest to 804 + 303 + 198? (a) 1400 (b) 1300 (c) 1500 (d) 1200
  9. 9.Which is closest to 1001 ÷ 19? (a) 500 (b) 100 (c) 25 (d) 50
  10. 10.Which is closest to 2004 ÷ 39? (a) 25 (b) 100 (c) 500 (d) 50
  11. 11.Which is closest to 705 + 197 + 399? (a) 1500 (b) 1400 (c) 1300 (d) 1200
  12. 12.Which is closest to 296 × 88? (Round each number first.) (a) 27000 (b) 54000 (c) 2700 (d) 270000
  13. 13.Which is closest to 297 + 199 + 600? (a) 1300 (b) 1000 (c) 1200 (d) 1100
  14. 14.Which is closest to 604 × 78? (Round each number first.) (a) 4800 (b) 480000 (c) 48000 (d) 96000
  15. 15.Which is closest to 597 × 92? (Round each number first.) (a) 540000 (b) 108000 (c) 5400 (d) 54000
  16. 16.Which is closest to 898 + 596 + 898? (a) 2400 (b) 2600 (c) 2300 (d) 2500
  17. 17.Round 89.81 to one decimal place. =
  18. 18.Round 90198 to the nearest thousand.
  19. 19.Which is closest to 802 + 495 + 804? (a) 2200 (b) 2000 (c) 2100 (d) 2300
  20. 20.Round 46122 to the nearest hundred.
  21. 21.Which is closest to 497 × 40? (Round each number first.) (a) 40000 (b) 200000 (c) 2000 (d) 20000
  22. 22.Round 68.31 to one decimal place. =
  23. 23.Round 15107 to the nearest hundred.
  24. 24.Which is closest to 3509 ÷ 51? (a) 700 (b) 140 (c) 35 (d) 70
  25. 25.Which is closest to 603 × 22? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  26. 26.Round 29182 to the nearest ten.
  27. 27.Which is closest to 891 ÷ 31? (a) 15 (b) 300 (c) 30 (d) 60
  28. 28.Which is closest to 700 × 69? (Round each number first.) (a) 4900 (b) 98000 (c) 49000 (d) 490000
  29. 29.Which is closest to 300 + 396 + 895? (a) 1700 (b) 1600 (c) 1500 (d) 1800
  30. 30.Which is closest to 2005 ÷ 49? (a) 40 (b) 400 (c) 20 (d) 80
  31. 31.Which is closest to 904 × 80? (Round each number first.) (a) 72000 (b) 144000 (c) 720000 (d) 7200
  32. 32.Round 77.46 to one decimal place. =
  33. 33.Which is closest to 196 × 59? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  34. 34.Which is closest to 600 ÷ 19? (a) 60 (b) 30 (c) 15 (d) 300
  35. 35.Which is closest to 896 ÷ 31? (a) 15 (b) 30 (c) 300 (d) 60
  36. 36.Round 29731 to the nearest ten.
  37. 37.Which is closest to 404 × 69? (Round each number first.) (a) 2800 (b) 28000 (c) 280000 (d) 56000
  38. 38.Round 9876 to the nearest thousand.
  39. 39.Round 45957 to the nearest ten.
  40. 40.Which is closest to 301 × 88? (Round each number first.) (a) 27000 (b) 54000 (c) 270000 (d) 2700

Answer key

  1. 30
  2. 1000
  3. 31.8
  4. 85400
  5. 80
  6. 35000
  7. 81000
  8. 1300
  9. 50
  10. 50
  11. 1300
  12. 27000
  13. 1100
  14. 48000
  15. 54000
  16. 2400
  17. 89.8
  18. 90000
  19. 2100
  20. 46100
  21. 20000
  22. 68.3
  23. 15100
  24. 70
  25. 12000
  26. 29180
  27. 30
  28. 49000
  29. 1600
  30. 40
  31. 72000
  32. 77.5
  33. 12000
  34. 30
  35. 30
  36. 29730
  37. 28000
  38. 10000
  39. 45960
  40. 27000

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