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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 91 · 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 5114 to the nearest hundred.
  2. 2.Which is closest to 401 + 296 + 98? (a) 700 (b) 900 (c) 800 (d) 1000
  3. 3.Which is closest to 2803 ÷ 39? (a) 700 (b) 70 (c) 140 (d) 35
  4. 4.Round 61.72 to one decimal place. =
  5. 5.Which is closest to 2101 ÷ 31? (a) 35 (b) 70 (c) 700 (d) 140
  6. 6.Round 51.17 to one decimal place. =
  7. 7.Which is closest to 304 × 29? (Round each number first.) (a) 900 (b) 18000 (c) 90000 (d) 9000
  8. 8.Which is closest to 398 + 799 + 397? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  9. 9.Which is closest to 296 × 19? (Round each number first.) (a) 6000 (b) 600 (c) 12000 (d) 60000
  10. 10.Which is closest to 697 + 200 + 199? (a) 1000 (b) 1100 (c) 1300 (d) 1200
  11. 11.Which is closest to 202 × 39? (Round each number first.) (a) 80000 (b) 16000 (c) 8000 (d) 800
  12. 12.Which is closest to 297 + 198 + 295? (a) 900 (b) 700 (c) 1000 (d) 800
  13. 13.Which is closest to 197 + 898 + 803? (a) 2000 (b) 1800 (c) 2100 (d) 1900
  14. 14.Round 39.63 to one decimal place. =
  15. 15.Which is closest to 1502 ÷ 49? (a) 300 (b) 60 (c) 30 (d) 15
  16. 16.Which is closest to 198 + 596 + 599? (a) 1400 (b) 1300 (c) 1500 (d) 1600
  17. 17.Round 80.57 to one decimal place. =
  18. 18.Round 50689 to the nearest thousand.
  19. 19.Round 17856 to the nearest hundred.
  20. 20.Round 76.23 to one decimal place. =
  21. 21.Which is closest to 197 × 19? (Round each number first.) (a) 8000 (b) 4000 (c) 40000 (d) 400
  22. 22.Which is closest to 1401 ÷ 19? (a) 700 (b) 140 (c) 35 (d) 70
  23. 23.Round 71184 to the nearest ten.
  24. 24.Round 11.69 to one decimal place. =
  25. 25.Round 45126 to the nearest ten.
  26. 26.Which is closest to 800 ÷ 41? (a) 40 (b) 10 (c) 200 (d) 20
  27. 27.Which is closest to 2807 ÷ 41? (a) 140 (b) 70 (c) 35 (d) 700
  28. 28.Which is closest to 497 + 797 + 804? (a) 2300 (b) 2000 (c) 2200 (d) 2100
  29. 29.Which is closest to 4495 ÷ 51? (a) 180 (b) 90 (c) 45 (d) 900
  30. 30.Round 92482 to the nearest hundred.
  31. 31.Round 60016 to the nearest thousand.
  32. 32.Which is closest to 2392 ÷ 41? (a) 600 (b) 60 (c) 30 (d) 120
  33. 33.Round 78.72 to one decimal place. =
  34. 34.Which is closest to 301 × 62? (Round each number first.) (a) 18000 (b) 36000 (c) 180000 (d) 1800
  35. 35.Which is closest to 199 × 59? (Round each number first.) (a) 12000 (b) 24000 (c) 1200 (d) 120000
  36. 36.Which is closest to 296 × 38? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  37. 37.Round 82866 to the nearest ten.
  38. 38.Round 97.89 to one decimal place. =
  39. 39.Which is closest to 202 + 895 + 696? (a) 2000 (b) 1800 (c) 1700 (d) 1900
  40. 40.Which is closest to 1491 ÷ 51? (a) 60 (b) 30 (c) 15 (d) 300

Answer key

  1. 5100
  2. 800
  3. 70
  4. 61.7
  5. 70
  6. 51.2
  7. 9000
  8. 1600
  9. 6000
  10. 1100
  11. 8000
  12. 800
  13. 1900
  14. 39.6
  15. 30
  16. 1400
  17. 80.6
  18. 51000
  19. 17900
  20. 76.2
  21. 4000
  22. 70
  23. 71180
  24. 11.7
  25. 45130
  26. 20
  27. 70
  28. 2100
  29. 90
  30. 92500
  31. 60000
  32. 60
  33. 78.7
  34. 18000
  35. 12000
  36. 12000
  37. 82870
  38. 97.9
  39. 1800
  40. 30

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