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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 114 · 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 25106 to the nearest hundred.
  2. 2.Round 43.94 to one decimal place. =
  3. 3.Which is closest to 2993 ÷ 51? (a) 60 (b) 30 (c) 120 (d) 600
  4. 4.Which is closest to 901 ÷ 31? (a) 60 (b) 15 (c) 300 (d) 30
  5. 5.Which is closest to 395 ÷ 21? (a) 20 (b) 40 (c) 10 (d) 200
  6. 6.Round 87433 to the nearest ten.
  7. 7.Round 33.26 to one decimal place. =
  8. 8.Which is closest to 105 + 896 + 803? (a) 1900 (b) 2000 (c) 1800 (d) 1700
  9. 9.Which is closest to 798 × 79? (Round each number first.) (a) 128000 (b) 6400 (c) 640000 (d) 64000
  10. 10.Which is closest to 302 + 597 + 96? (a) 1100 (b) 900 (c) 1200 (d) 1000
  11. 11.Round 41613 to the nearest thousand.
  12. 12.Which is closest to 197 + 698 + 197? (a) 1100 (b) 1300 (c) 1200 (d) 1000
  13. 13.Round 88.26 to one decimal place. =
  14. 14.Round 82329 to the nearest ten.
  15. 15.Round 35.64 to one decimal place. =
  16. 16.Round 58815 to the nearest hundred.
  17. 17.Which is closest to 298 × 61? (Round each number first.) (a) 180000 (b) 1800 (c) 18000 (d) 36000
  18. 18.Which is closest to 400 × 88? (Round each number first.) (a) 36000 (b) 72000 (c) 360000 (d) 3600
  19. 19.Round 26.13 to one decimal place. =
  20. 20.Round 56.58 to one decimal place. =
  21. 21.Round 44312 to the nearest thousand.
  22. 22.Which is closest to 701 × 51? (Round each number first.) (a) 35000 (b) 3500 (c) 70000 (d) 350000
  23. 23.Which is closest to 1201 ÷ 41? (a) 60 (b) 300 (c) 15 (d) 30
  24. 24.Round 64.62 to one decimal place. =
  25. 25.Round 7889 to the nearest ten.
  26. 26.Which is closest to 601 × 68? (Round each number first.) (a) 4200 (b) 84000 (c) 42000 (d) 420000
  27. 27.Which is closest to 1508 ÷ 49? (a) 60 (b) 30 (c) 15 (d) 300
  28. 28.Round 46788 to the nearest ten.
  29. 29.Round 11.57 to one decimal place. =
  30. 30.Which is closest to 902 × 30? (Round each number first.) (a) 2700 (b) 270000 (c) 54000 (d) 27000
  31. 31.Which is closest to 399 × 71? (Round each number first.) (a) 280000 (b) 56000 (c) 28000 (d) 2800
  32. 32.Which is closest to 296 × 18? (Round each number first.) (a) 600 (b) 6000 (c) 12000 (d) 60000
  33. 33.Which is closest to 301 × 21? (Round each number first.) (a) 600 (b) 60000 (c) 12000 (d) 6000
  34. 34.Round 77.27 to one decimal place. =
  35. 35.Round 68.24 to one decimal place. =
  36. 36.Which is closest to 802 × 60? (Round each number first.) (a) 480000 (b) 96000 (c) 48000 (d) 4800
  37. 37.Which is closest to 399 ÷ 21? (a) 40 (b) 10 (c) 20 (d) 200
  38. 38.Round 53.56 to one decimal place. =
  39. 39.Which is closest to 800 + 804 + 196? (a) 1700 (b) 1900 (c) 1800 (d) 2000
  40. 40.Which is closest to 903 × 79? (Round each number first.) (a) 720000 (b) 72000 (c) 7200 (d) 144000

Answer key

  1. 25100
  2. 43.9
  3. 60
  4. 30
  5. 20
  6. 87430
  7. 33.3
  8. 1800
  9. 64000
  10. 1000
  11. 42000
  12. 1100
  13. 88.3
  14. 82330
  15. 35.6
  16. 58800
  17. 18000
  18. 36000
  19. 26.1
  20. 56.6
  21. 44000
  22. 35000
  23. 30
  24. 64.6
  25. 7890
  26. 42000
  27. 30
  28. 46790
  29. 11.6
  30. 27000
  31. 28000
  32. 6000
  33. 6000
  34. 77.3
  35. 68.2
  36. 48000
  37. 20
  38. 53.6
  39. 1800
  40. 72000

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