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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 298 · 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 703 × 30? (Round each number first.) (a) 210000 (b) 2100 (c) 42000 (d) 21000
  2. 2.Which is closest to 604 + 395 + 205? (a) 1200 (b) 1300 (c) 1100 (d) 1400
  3. 3.Which is closest to 804 + 800 + 698? (a) 2200 (b) 2500 (c) 2400 (d) 2300
  4. 4.Round 20.16 to one decimal place. =
  5. 5.Round 85.74 to one decimal place. =
  6. 6.Which is closest to 604 × 59? (Round each number first.) (a) 72000 (b) 360000 (c) 36000 (d) 3600
  7. 7.Which is closest to 402 × 78? (Round each number first.) (a) 320000 (b) 32000 (c) 64000 (d) 3200
  8. 8.Round 59.67 to one decimal place. =
  9. 9.Which is closest to 698 × 30? (Round each number first.) (a) 2100 (b) 210000 (c) 21000 (d) 42000
  10. 10.Which is closest to 95 + 397 + 605? (a) 1300 (b) 1000 (c) 1100 (d) 1200
  11. 11.Round 35.89 to one decimal place. =
  12. 12.Which is closest to 504 + 96 + 95? (a) 600 (b) 900 (c) 700 (d) 800
  13. 13.Which is closest to 302 + 297 + 403? (a) 1200 (b) 1100 (c) 900 (d) 1000
  14. 14.Which is closest to 3603 ÷ 39? (a) 45 (b) 900 (c) 180 (d) 90
  15. 15.Which is closest to 703 × 62? (Round each number first.) (a) 4200 (b) 420000 (c) 84000 (d) 42000
  16. 16.Round 99.73 to one decimal place. =
  17. 17.Round 9269 to the nearest hundred.
  18. 18.Which is closest to 402 × 59? (Round each number first.) (a) 2400 (b) 240000 (c) 24000 (d) 48000
  19. 19.Round 53.39 to one decimal place. =
  20. 20.Which is closest to 601 + 495 + 104? (a) 1100 (b) 1300 (c) 1400 (d) 1200
  21. 21.Round 73.41 to one decimal place. =
  22. 22.Which is closest to 1200 ÷ 29? (a) 80 (b) 40 (c) 20 (d) 400
  23. 23.Which is closest to 803 + 604 + 405? (a) 1700 (b) 2000 (c) 1800 (d) 1900
  24. 24.Round 38195 to the nearest hundred.
  25. 25.Which is closest to 597 × 52? (Round each number first.) (a) 3000 (b) 300000 (c) 60000 (d) 30000
  26. 26.Which is closest to 1797 ÷ 29? (a) 120 (b) 60 (c) 600 (d) 30
  27. 27.Round 46395 to the nearest hundred.
  28. 28.Which is closest to 405 ÷ 19? (a) 20 (b) 40 (c) 200 (d) 10
  29. 29.Round 5717 to the nearest thousand.
  30. 30.Which is closest to 1798 ÷ 21? (a) 90 (b) 45 (c) 900 (d) 180
  31. 31.Which is closest to 199 × 92? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  32. 32.Which is closest to 803 × 71? (Round each number first.) (a) 56000 (b) 112000 (c) 560000 (d) 5600
  33. 33.Which is closest to 904 × 31? (Round each number first.) (a) 270000 (b) 54000 (c) 27000 (d) 2700
  34. 34.Which is closest to 3995 ÷ 51? (a) 800 (b) 80 (c) 40 (d) 160
  35. 35.Round 45636 to the nearest hundred.
  36. 36.Which is closest to 504 × 69? (Round each number first.) (a) 3500 (b) 350000 (c) 35000 (d) 70000
  37. 37.Round 39182 to the nearest hundred.
  38. 38.Round 18733 to the nearest ten.
  39. 39.Round 84.82 to one decimal place. =
  40. 40.Which is closest to 301 × 78? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000

Answer key

  1. 21000
  2. 1200
  3. 2300
  4. 20.2
  5. 85.7
  6. 36000
  7. 32000
  8. 59.7
  9. 21000
  10. 1100
  11. 35.9
  12. 700
  13. 1000
  14. 90
  15. 42000
  16. 99.7
  17. 9300
  18. 24000
  19. 53.4
  20. 1200
  21. 73.4
  22. 40
  23. 1800
  24. 38200
  25. 30000
  26. 60
  27. 46400
  28. 20
  29. 6000
  30. 90
  31. 18000
  32. 56000
  33. 27000
  34. 80
  35. 45600
  36. 35000
  37. 39200
  38. 18730
  39. 84.8
  40. 24000

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