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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 281 · 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 796 × 69? (Round each number first.) (a) 56000 (b) 5600 (c) 112000 (d) 560000
  2. 2.Which is closest to 699 × 51? (Round each number first.) (a) 350000 (b) 35000 (c) 70000 (d) 3500
  3. 3.Round 77212 to the nearest hundred.
  4. 4.Round 98.08 to one decimal place. =
  5. 5.Round 45231 to the nearest ten.
  6. 6.Which is closest to 2394 ÷ 31? (a) 800 (b) 80 (c) 40 (d) 160
  7. 7.Round 37.22 to one decimal place. =
  8. 8.Round 85908 to the nearest hundred.
  9. 9.Which is closest to 299 × 31? (Round each number first.) (a) 9000 (b) 18000 (c) 900 (d) 90000
  10. 10.Round 16.59 to one decimal place. =
  11. 11.Which is closest to 1004 ÷ 49? (a) 200 (b) 20 (c) 10 (d) 40
  12. 12.Round 47089 to the nearest ten.
  13. 13.Round 84124 to the nearest hundred.
  14. 14.Which is closest to 96 + 795 + 697? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  15. 15.Round 19710 to the nearest hundred.
  16. 16.Which is closest to 701 + 899 + 305? (a) 2100 (b) 1800 (c) 2000 (d) 1900
  17. 17.Which is closest to 97 + 898 + 596? (a) 1600 (b) 1700 (c) 1800 (d) 1500
  18. 18.Which is closest to 495 + 697 + 195? (a) 1600 (b) 1300 (c) 1400 (d) 1500
  19. 19.Round 96.86 to one decimal place. =
  20. 20.Round 9099 to the nearest thousand.
  21. 21.Which is closest to 300 × 28? (Round each number first.) (a) 18000 (b) 90000 (c) 900 (d) 9000
  22. 22.Round 90.16 to one decimal place. =
  23. 23.Which is closest to 703 × 72? (Round each number first.) (a) 49000 (b) 98000 (c) 4900 (d) 490000
  24. 24.Round 38.86 to one decimal place. =
  25. 25.Which is closest to 297 × 18? (Round each number first.) (a) 12000 (b) 6000 (c) 600 (d) 60000
  26. 26.Which is closest to 500 × 19? (Round each number first.) (a) 100000 (b) 1000 (c) 20000 (d) 10000
  27. 27.Which is closest to 2005 ÷ 51? (a) 400 (b) 20 (c) 80 (d) 40
  28. 28.Round 50.58 to one decimal place. =
  29. 29.Which is closest to 200 + 900 + 305? (a) 1300 (b) 1500 (c) 1600 (d) 1400
  30. 30.Round 51.33 to one decimal place. =
  31. 31.Which is closest to 901 × 61? (Round each number first.) (a) 108000 (b) 540000 (c) 5400 (d) 54000
  32. 32.Which is closest to 100 + 303 + 904? (a) 1500 (b) 1200 (c) 1400 (d) 1300
  33. 33.Which is closest to 699 × 28? (Round each number first.) (a) 210000 (b) 42000 (c) 2100 (d) 21000
  34. 34.Round 79.24 to one decimal place. =
  35. 35.Round 44009 to the nearest ten.
  36. 36.Round 40.51 to one decimal place. =
  37. 37.Round 30.34 to one decimal place. =
  38. 38.Round 63831 to the nearest thousand.
  39. 39.Which is closest to 602 ÷ 19? (a) 15 (b) 300 (c) 60 (d) 30
  40. 40.Which is closest to 102 + 201 + 402? (a) 700 (b) 800 (c) 900 (d) 600

Answer key

  1. 56000
  2. 35000
  3. 77200
  4. 98.1
  5. 45230
  6. 80
  7. 37.2
  8. 85900
  9. 9000
  10. 16.6
  11. 20
  12. 47090
  13. 84100
  14. 1600
  15. 19700
  16. 1900
  17. 1600
  18. 1400
  19. 96.9
  20. 9000
  21. 9000
  22. 90.2
  23. 49000
  24. 38.9
  25. 6000
  26. 10000
  27. 40
  28. 50.6
  29. 1400
  30. 51.3
  31. 54000
  32. 1300
  33. 21000
  34. 79.2
  35. 44010
  36. 40.5
  37. 30.3
  38. 64000
  39. 30
  40. 700

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