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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 433 · 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 37.37 to one decimal place. =
  2. 2.Which is closest to 2402 ÷ 29? (a) 80 (b) 160 (c) 40 (d) 800
  3. 3.Which is closest to 1793 ÷ 31? (a) 30 (b) 600 (c) 60 (d) 120
  4. 4.Round 28.32 to one decimal place. =
  5. 5.Round 27104 to the nearest thousand.
  6. 6.Which is closest to 997 ÷ 49? (a) 40 (b) 10 (c) 20 (d) 200
  7. 7.Round 41784 to the nearest hundred.
  8. 8.Which is closest to 2105 ÷ 29? (a) 35 (b) 70 (c) 700 (d) 140
  9. 9.Which is closest to 301 × 52? (Round each number first.) (a) 1500 (b) 150000 (c) 15000 (d) 30000
  10. 10.Round 75173 to the nearest thousand.
  11. 11.Round 56.28 to one decimal place. =
  12. 12.Which is closest to 795 ÷ 21? (a) 20 (b) 40 (c) 400 (d) 80
  13. 13.Round 55652 to the nearest hundred.
  14. 14.Which is closest to 400 + 298 + 704? (a) 1600 (b) 1400 (c) 1300 (d) 1500
  15. 15.Which is closest to 2396 ÷ 39? (a) 120 (b) 30 (c) 600 (d) 60
  16. 16.Which is closest to 601 × 80? (Round each number first.) (a) 96000 (b) 4800 (c) 480000 (d) 48000
  17. 17.Round 9188 to the nearest hundred.
  18. 18.Which is closest to 600 ÷ 21? (a) 300 (b) 15 (c) 60 (d) 30
  19. 19.Round 61.91 to one decimal place. =
  20. 20.Round 48379 to the nearest hundred.
  21. 21.Round 49.33 to one decimal place. =
  22. 22.Which is closest to 300 × 89? (Round each number first.) (a) 270000 (b) 2700 (c) 54000 (d) 27000
  23. 23.Which is closest to 796 × 78? (Round each number first.) (a) 128000 (b) 64000 (c) 640000 (d) 6400
  24. 24.Which is closest to 2695 ÷ 31? (a) 900 (b) 180 (c) 90 (d) 45
  25. 25.Which is closest to 198 + 600 + 196? (a) 1200 (b) 1100 (c) 900 (d) 1000
  26. 26.Round 41.68 to one decimal place. =
  27. 27.Which is closest to 203 × 28? (Round each number first.) (a) 6000 (b) 12000 (c) 600 (d) 60000
  28. 28.Round 60929 to the nearest hundred.
  29. 29.Which is closest to 902 + 205 + 597? (a) 1600 (b) 1800 (c) 1700 (d) 1900
  30. 30.Which is closest to 1997 ÷ 51? (a) 80 (b) 20 (c) 40 (d) 400
  31. 31.Which is closest to 198 × 71? (Round each number first.) (a) 14000 (b) 1400 (c) 140000 (d) 28000
  32. 32.Round 78.52 to one decimal place. =
  33. 33.Which is closest to 203 × 59? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  34. 34.Round 20.06 to one decimal place. =
  35. 35.Which is closest to 1207 ÷ 21? (a) 120 (b) 30 (c) 60 (d) 600
  36. 36.Which is closest to 296 + 201 + 599? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  37. 37.Which is closest to 301 + 896 + 799? (a) 2200 (b) 2000 (c) 1900 (d) 2100
  38. 38.Which is closest to 701 × 81? (Round each number first.) (a) 5600 (b) 560000 (c) 56000 (d) 112000
  39. 39.Which is closest to 404 × 71? (Round each number first.) (a) 280000 (b) 56000 (c) 2800 (d) 28000
  40. 40.Which is closest to 496 + 303 + 196? (a) 1000 (b) 1200 (c) 1100 (d) 900

Answer key

  1. 37.4
  2. 80
  3. 60
  4. 28.3
  5. 27000
  6. 20
  7. 41800
  8. 70
  9. 15000
  10. 75000
  11. 56.3
  12. 40
  13. 55700
  14. 1400
  15. 60
  16. 48000
  17. 9200
  18. 30
  19. 61.9
  20. 48400
  21. 49.3
  22. 27000
  23. 64000
  24. 90
  25. 1000
  26. 41.7
  27. 6000
  28. 60900
  29. 1700
  30. 40
  31. 14000
  32. 78.5
  33. 12000
  34. 20.1
  35. 60
  36. 1100
  37. 2000
  38. 56000
  39. 28000
  40. 1000

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