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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 666 · 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 73.09 to one decimal place. =
  2. 2.Round 43.56 to one decimal place. =
  3. 3.Which is closest to 605 + 902 + 205? (a) 1700 (b) 1600 (c) 1900 (d) 1800
  4. 4.Which is closest to 496 + 495 + 295? (a) 1300 (b) 1200 (c) 1400 (d) 1500
  5. 5.Round 83390 to the nearest hundred.
  6. 6.Which is closest to 402 × 31? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  7. 7.Which is closest to 1597 ÷ 39? (a) 80 (b) 20 (c) 400 (d) 40
  8. 8.Round 62819 to the nearest thousand.
  9. 9.Round 46301 to the nearest thousand.
  10. 10.Which is closest to 1005 ÷ 21? (a) 500 (b) 100 (c) 50 (d) 25
  11. 11.Which is closest to 95 + 304 + 497? (a) 800 (b) 1100 (c) 900 (d) 1000
  12. 12.Round 66.94 to one decimal place. =
  13. 13.Round 86081 to the nearest thousand.
  14. 14.Which is closest to 703 × 30? (Round each number first.) (a) 2100 (b) 42000 (c) 210000 (d) 21000
  15. 15.Which is closest to 501 + 105 + 704? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  16. 16.Which is closest to 598 × 22? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  17. 17.Round 12.28 to one decimal place. =
  18. 18.Round 27191 to the nearest thousand.
  19. 19.Which is closest to 202 × 78? (Round each number first.) (a) 16000 (b) 32000 (c) 1600 (d) 160000
  20. 20.Which is closest to 2399 ÷ 29? (a) 800 (b) 40 (c) 80 (d) 160
  21. 21.Which is closest to 303 × 41? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  22. 22.Which is closest to 397 + 399 + 201? (a) 900 (b) 1100 (c) 1000 (d) 1200
  23. 23.Which is closest to 898 × 60? (Round each number first.) (a) 54000 (b) 108000 (c) 540000 (d) 5400
  24. 24.Round 23.76 to one decimal place. =
  25. 25.Which is closest to 803 × 31? (Round each number first.) (a) 240000 (b) 48000 (c) 24000 (d) 2400
  26. 26.Round 72964 to the nearest ten.
  27. 27.Round 76.62 to one decimal place. =
  28. 28.Round 10968 to the nearest ten.
  29. 29.Round 38.07 to one decimal place. =
  30. 30.Which is closest to 504 × 29? (Round each number first.) (a) 150000 (b) 15000 (c) 1500 (d) 30000
  31. 31.Which is closest to 296 × 20? (Round each number first.) (a) 600 (b) 6000 (c) 60000 (d) 12000
  32. 32.Round 28.29 to one decimal place. =
  33. 33.Which is closest to 1504 ÷ 49? (a) 30 (b) 15 (c) 300 (d) 60
  34. 34.Which is closest to 399 × 41? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
  35. 35.Round 25936 to the nearest ten.
  36. 36.Round 30951 to the nearest ten.
  37. 37.Which is closest to 697 × 59? (Round each number first.) (a) 4200 (b) 84000 (c) 420000 (d) 42000
  38. 38.Round 88937 to the nearest thousand.
  39. 39.Which is closest to 1003 ÷ 19? (a) 100 (b) 25 (c) 500 (d) 50
  40. 40.Round 14.27 to one decimal place. =

Answer key

  1. 73.1
  2. 43.6
  3. 1700
  4. 1300
  5. 83400
  6. 12000
  7. 40
  8. 63000
  9. 46000
  10. 50
  11. 900
  12. 66.9
  13. 86000
  14. 21000
  15. 1300
  16. 12000
  17. 12.3
  18. 27000
  19. 16000
  20. 80
  21. 12000
  22. 1000
  23. 54000
  24. 23.8
  25. 24000
  26. 72960
  27. 76.6
  28. 10970
  29. 38.1
  30. 15000
  31. 6000
  32. 28.3
  33. 30
  34. 16000
  35. 25940
  36. 30950
  37. 42000
  38. 89000
  39. 50
  40. 14.3

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