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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 742 · 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.Round 77.71 to one decimal place. =
  2. 2.Round 20671 to the nearest hundred.
  3. 3.Which is closest to 696 × 60? (Round each number first.) (a) 84000 (b) 42000 (c) 420000 (d) 4200
  4. 4.Which is closest to 799 + 703 + 504? (a) 2000 (b) 2100 (c) 1900 (d) 2200
  5. 5.Which is closest to 898 + 203 + 301? (a) 1600 (b) 1300 (c) 1400 (d) 1500
  6. 6.Which is closest to 796 + 900 + 400? (a) 2100 (b) 2200 (c) 2300 (d) 2000
  7. 7.Which is closest to 1206 ÷ 31? (a) 400 (b) 40 (c) 20 (d) 80
  8. 8.Which is closest to 896 × 60? (Round each number first.) (a) 5400 (b) 540000 (c) 108000 (d) 54000
  9. 9.Round 95.21 to one decimal place. =
  10. 10.Round 71.24 to one decimal place. =
  11. 11.Round 17.37 to one decimal place. =
  12. 12.Which is closest to 902 + 495 + 799? (a) 2400 (b) 2200 (c) 2100 (d) 2300
  13. 13.Which is closest to 598 × 60? (Round each number first.) (a) 36000 (b) 72000 (c) 3600 (d) 360000
  14. 14.Round 31.41 to one decimal place. =
  15. 15.Which is closest to 2406 ÷ 31? (a) 800 (b) 160 (c) 80 (d) 40
  16. 16.Which is closest to 1793 ÷ 31? (a) 120 (b) 600 (c) 60 (d) 30
  17. 17.Which is closest to 602 ÷ 31? (a) 20 (b) 10 (c) 40 (d) 200
  18. 18.Round 39.24 to one decimal place. =
  19. 19.Which is closest to 405 ÷ 19? (a) 40 (b) 200 (c) 10 (d) 20
  20. 20.Round 54114 to the nearest thousand.
  21. 21.Round 98184 to the nearest thousand.
  22. 22.Round 31.94 to one decimal place. =
  23. 23.Which is closest to 703 + 600 + 198? (a) 1400 (b) 1500 (c) 1600 (d) 1700
  24. 24.Which is closest to 2492 ÷ 49? (a) 50 (b) 100 (c) 500 (d) 25
  25. 25.Which is closest to 2005 ÷ 39? (a) 25 (b) 500 (c) 100 (d) 50
  26. 26.Which is closest to 696 + 298 + 800? (a) 1800 (b) 2000 (c) 1900 (d) 1700
  27. 27.Which is closest to 600 + 800 + 905? (a) 2400 (b) 2200 (c) 2500 (d) 2300
  28. 28.Which is closest to 391 ÷ 19? (a) 10 (b) 200 (c) 20 (d) 40
  29. 29.Which is closest to 597 × 89? (Round each number first.) (a) 54000 (b) 540000 (c) 5400 (d) 108000
  30. 30.Round 11.57 to one decimal place. =
  31. 31.Which is closest to 695 + 101 + 104? (a) 900 (b) 1000 (c) 1100 (d) 800
  32. 32.Which is closest to 295 + 901 + 196? (a) 1400 (b) 1300 (c) 1600 (d) 1500
  33. 33.Which is closest to 3192 ÷ 39? (a) 160 (b) 800 (c) 80 (d) 40
  34. 34.Which is closest to 904 + 803 + 699? (a) 2300 (b) 2600 (c) 2500 (d) 2400
  35. 35.Round 11.32 to one decimal place. =
  36. 36.Which is closest to 302 × 28? (Round each number first.) (a) 18000 (b) 900 (c) 9000 (d) 90000
  37. 37.Which is closest to 496 × 59? (Round each number first.) (a) 3000 (b) 60000 (c) 30000 (d) 300000
  38. 38.Which is closest to 2392 ÷ 31? (a) 160 (b) 800 (c) 80 (d) 40
  39. 39.Round 69.38 to one decimal place. =
  40. 40.Which is closest to 900 + 205 + 200? (a) 1300 (b) 1500 (c) 1200 (d) 1400

Answer key

  1. 77.7
  2. 20700
  3. 42000
  4. 2000
  5. 1400
  6. 2100
  7. 40
  8. 54000
  9. 95.2
  10. 71.2
  11. 17.4
  12. 2200
  13. 36000
  14. 31.4
  15. 80
  16. 60
  17. 20
  18. 39.2
  19. 20
  20. 54000
  21. 98000
  22. 31.9
  23. 1500
  24. 50
  25. 50
  26. 1800
  27. 2300
  28. 20
  29. 54000
  30. 11.6
  31. 900
  32. 1400
  33. 80
  34. 2400
  35. 11.3
  36. 9000
  37. 30000
  38. 80
  39. 69.4
  40. 1300

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