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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 382 · 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 74201 to the nearest thousand.
  2. 2.Which is closest to 400 + 702 + 301? (a) 1400 (b) 1600 (c) 1300 (d) 1500
  3. 3.Round 54454 to the nearest ten.
  4. 4.Which is closest to 504 × 42? (Round each number first.) (a) 40000 (b) 2000 (c) 20000 (d) 200000
  5. 5.Which is closest to 296 × 30? (Round each number first.) (a) 18000 (b) 9000 (c) 900 (d) 90000
  6. 6.Which is closest to 402 + 897 + 297? (a) 1500 (b) 1800 (c) 1700 (d) 1600
  7. 7.Which is closest to 498 + 805 + 195? (a) 1400 (b) 1700 (c) 1500 (d) 1600
  8. 8.Which is closest to 402 × 90? (Round each number first.) (a) 360000 (b) 36000 (c) 72000 (d) 3600
  9. 9.Which is closest to 596 × 19? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200
  10. 10.Which is closest to 602 + 303 + 696? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  11. 11.Which is closest to 2393 ÷ 29? (a) 160 (b) 40 (c) 80 (d) 800
  12. 12.Round 30625 to the nearest thousand.
  13. 13.Which is closest to 1192 ÷ 29? (a) 40 (b) 20 (c) 80 (d) 400
  14. 14.Round 92.64 to one decimal place. =
  15. 15.Which is closest to 201 + 96 + 595? (a) 1100 (b) 800 (c) 900 (d) 1000
  16. 16.Round 28.23 to one decimal place. =
  17. 17.Which is closest to 601 × 28? (Round each number first.) (a) 180000 (b) 1800 (c) 18000 (d) 36000
  18. 18.Which is closest to 897 + 405 + 502? (a) 1900 (b) 1700 (c) 2000 (d) 1800
  19. 19.Round 29.87 to one decimal place. =
  20. 20.Which is closest to 1593 ÷ 39? (a) 80 (b) 20 (c) 40 (d) 400
  21. 21.Which is closest to 1808 ÷ 21? (a) 45 (b) 180 (c) 900 (d) 90
  22. 22.Round 14.18 to one decimal place. =
  23. 23.Which is closest to 893 ÷ 29? (a) 60 (b) 15 (c) 30 (d) 300
  24. 24.Which is closest to 196 × 82? (Round each number first.) (a) 160000 (b) 1600 (c) 32000 (d) 16000
  25. 25.Round 27.27 to one decimal place. =
  26. 26.Round 94069 to the nearest hundred.
  27. 27.Which is closest to 701 × 42? (Round each number first.) (a) 2800 (b) 56000 (c) 28000 (d) 280000
  28. 28.Which is closest to 197 × 38? (Round each number first.) (a) 800 (b) 80000 (c) 16000 (d) 8000
  29. 29.Which is closest to 197 × 68? (Round each number first.) (a) 1400 (b) 140000 (c) 28000 (d) 14000
  30. 30.Which is closest to 501 + 697 + 704? (a) 1800 (b) 2100 (c) 2000 (d) 1900
  31. 31.Which is closest to 600 ÷ 19? (a) 15 (b) 300 (c) 60 (d) 30
  32. 32.Which is closest to 804 × 80? (Round each number first.) (a) 128000 (b) 64000 (c) 6400 (d) 640000
  33. 33.Round 53.76 to one decimal place. =
  34. 34.Round 28773 to the nearest thousand.
  35. 35.Round 85.63 to one decimal place. =
  36. 36.Round 57639 to the nearest thousand.
  37. 37.Round 11892 to the nearest hundred.
  38. 38.Which is closest to 704 × 90? (Round each number first.) (a) 126000 (b) 630000 (c) 6300 (d) 63000
  39. 39.Which is closest to 697 + 198 + 505? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  40. 40.Which is closest to 1591 ÷ 19? (a) 40 (b) 800 (c) 160 (d) 80

Answer key

  1. 74000
  2. 1400
  3. 54450
  4. 20000
  5. 9000
  6. 1600
  7. 1500
  8. 36000
  9. 12000
  10. 1600
  11. 80
  12. 31000
  13. 40
  14. 92.6
  15. 900
  16. 28.2
  17. 18000
  18. 1800
  19. 29.9
  20. 40
  21. 90
  22. 14.2
  23. 30
  24. 16000
  25. 27.3
  26. 94100
  27. 28000
  28. 8000
  29. 14000
  30. 1900
  31. 30
  32. 64000
  33. 53.8
  34. 29000
  35. 85.6
  36. 58000
  37. 11900
  38. 63000
  39. 1400
  40. 80

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