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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 380 · 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 601 × 39? (Round each number first.) (a) 2400 (b) 240000 (c) 24000 (d) 48000
  2. 2.Round 69.78 to one decimal place. =
  3. 3.Round 60.29 to one decimal place. =
  4. 4.Round 26.28 to one decimal place. =
  5. 5.Which is closest to 1591 ÷ 19? (a) 40 (b) 160 (c) 800 (d) 80
  6. 6.Round 44.26 to one decimal place. =
  7. 7.Which is closest to 1205 ÷ 31? (a) 20 (b) 400 (c) 80 (d) 40
  8. 8.Which is closest to 296 + 595 + 101? (a) 900 (b) 1000 (c) 1200 (d) 1100
  9. 9.Which is closest to 902 + 295 + 398? (a) 1800 (b) 1500 (c) 1600 (d) 1700
  10. 10.Round 22.09 to one decimal place. =
  11. 11.Which is closest to 2099 ÷ 29? (a) 35 (b) 70 (c) 140 (d) 700
  12. 12.Round 63.66 to one decimal place. =
  13. 13.Which is closest to 298 × 32? (Round each number first.) (a) 900 (b) 9000 (c) 18000 (d) 90000
  14. 14.Which is closest to 700 + 801 + 499? (a) 2000 (b) 2100 (c) 2200 (d) 1900
  15. 15.Which is closest to 196 + 601 + 295? (a) 1300 (b) 1000 (c) 1200 (d) 1100
  16. 16.Which is closest to 704 + 502 + 204? (a) 1600 (b) 1500 (c) 1300 (d) 1400
  17. 17.Round 42926 to the nearest ten.
  18. 18.Which is closest to 805 + 295 + 196? (a) 1200 (b) 1300 (c) 1500 (d) 1400
  19. 19.Round 55.81 to one decimal place. =
  20. 20.Round 26.78 to one decimal place. =
  21. 21.Round 26.61 to one decimal place. =
  22. 22.Round 68132 to the nearest thousand.
  23. 23.Which is closest to 804 × 31? (Round each number first.) (a) 48000 (b) 24000 (c) 2400 (d) 240000
  24. 24.Round 39058 to the nearest thousand.
  25. 25.Round 50037 to the nearest thousand.
  26. 26.Round 41143 to the nearest ten.
  27. 27.Round 25.84 to one decimal place. =
  28. 28.Which is closest to 599 × 32? (Round each number first.) (a) 18000 (b) 36000 (c) 180000 (d) 1800
  29. 29.Round 98.47 to one decimal place. =
  30. 30.Which is closest to 97 + 299 + 405? (a) 700 (b) 900 (c) 1000 (d) 800
  31. 31.Round 85666 to the nearest thousand.
  32. 32.Which is closest to 596 × 71? (Round each number first.) (a) 4200 (b) 84000 (c) 420000 (d) 42000
  33. 33.Which is closest to 791 ÷ 19? (a) 40 (b) 80 (c) 400 (d) 20
  34. 34.Which is closest to 399 × 32? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  35. 35.Round 19347 to the nearest ten.
  36. 36.Round 48826 to the nearest thousand.
  37. 37.Which is closest to 304 × 30? (Round each number first.) (a) 9000 (b) 90000 (c) 18000 (d) 900
  38. 38.Which is closest to 2506 ÷ 49? (a) 500 (b) 50 (c) 25 (d) 100
  39. 39.Which is closest to 205 + 904 + 699? (a) 1800 (b) 1900 (c) 2000 (d) 1700
  40. 40.Which is closest to 1407 ÷ 19? (a) 35 (b) 70 (c) 700 (d) 140

Answer key

  1. 24000
  2. 69.8
  3. 60.3
  4. 26.3
  5. 80
  6. 44.3
  7. 40
  8. 1000
  9. 1600
  10. 22.1
  11. 70
  12. 63.7
  13. 9000
  14. 2000
  15. 1100
  16. 1400
  17. 42930
  18. 1300
  19. 55.8
  20. 26.8
  21. 26.6
  22. 68000
  23. 24000
  24. 39000
  25. 50000
  26. 41140
  27. 25.8
  28. 18000
  29. 98.5
  30. 800
  31. 86000
  32. 42000
  33. 40
  34. 12000
  35. 19350
  36. 49000
  37. 9000
  38. 50
  39. 1800
  40. 70

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