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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 128 · 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 1191 ÷ 39? (a) 60 (b) 30 (c) 300 (d) 15
  2. 2.Which is closest to 597 × 62? (Round each number first.) (a) 36000 (b) 3600 (c) 72000 (d) 360000
  3. 3.Round 90668 to the nearest thousand.
  4. 4.Round 60.16 to one decimal place. =
  5. 5.Which is closest to 703 × 69? (Round each number first.) (a) 490000 (b) 4900 (c) 49000 (d) 98000
  6. 6.Round 53389 to the nearest hundred.
  7. 7.Round 43.82 to one decimal place. =
  8. 8.Round 11.94 to one decimal place. =
  9. 9.Round 20446 to the nearest ten.
  10. 10.Round 76.16 to one decimal place. =
  11. 11.Which is closest to 2391 ÷ 39? (a) 30 (b) 120 (c) 60 (d) 600
  12. 12.Which is closest to 902 + 603 + 899? (a) 2300 (b) 2500 (c) 2600 (d) 2400
  13. 13.Round 31.78 to one decimal place. =
  14. 14.Which is closest to 700 × 19? (Round each number first.) (a) 14000 (b) 1400 (c) 28000 (d) 140000
  15. 15.Which is closest to 603 × 82? (Round each number first.) (a) 48000 (b) 96000 (c) 4800 (d) 480000
  16. 16.Round 29.66 to one decimal place. =
  17. 17.Which is closest to 296 + 696 + 598? (a) 1700 (b) 1600 (c) 1800 (d) 1500
  18. 18.Which is closest to 1808 ÷ 29? (a) 120 (b) 30 (c) 600 (d) 60
  19. 19.Which is closest to 1492 ÷ 49? (a) 60 (b) 15 (c) 30 (d) 300
  20. 20.Which is closest to 3009 ÷ 49? (a) 60 (b) 120 (c) 600 (d) 30
  21. 21.Round 45.93 to one decimal place. =
  22. 22.Which is closest to 1394 ÷ 19? (a) 140 (b) 35 (c) 70 (d) 700
  23. 23.Round 31.42 to one decimal place. =
  24. 24.Which is closest to 401 × 61? (Round each number first.) (a) 24000 (b) 48000 (c) 240000 (d) 2400
  25. 25.Round 68134 to the nearest hundred.
  26. 26.Which is closest to 403 + 697 + 696? (a) 1800 (b) 1700 (c) 1900 (d) 2000
  27. 27.Which is closest to 900 + 95 + 704? (a) 1600 (b) 1800 (c) 1900 (d) 1700
  28. 28.Round 23.56 to one decimal place. =
  29. 29.Which is closest to 2391 ÷ 31? (a) 160 (b) 800 (c) 40 (d) 80
  30. 30.Round 3139 to the nearest thousand.
  31. 31.Round 86598 to the nearest thousand.
  32. 32.Which is closest to 1399 ÷ 21? (a) 700 (b) 140 (c) 70 (d) 35
  33. 33.Which is closest to 896 × 51? (Round each number first.) (a) 450000 (b) 45000 (c) 90000 (d) 4500
  34. 34.Round 9156 to the nearest hundred.
  35. 35.Round 19026 to the nearest thousand.
  36. 36.Round 79.09 to one decimal place. =
  37. 37.Round 37.82 to one decimal place. =
  38. 38.Round 34112 to the nearest ten.
  39. 39.Which is closest to 102 + 200 + 797? (a) 1100 (b) 1200 (c) 1000 (d) 1300
  40. 40.Which is closest to 401 × 78? (Round each number first.) (a) 320000 (b) 3200 (c) 32000 (d) 64000

Answer key

  1. 30
  2. 36000
  3. 91000
  4. 60.2
  5. 49000
  6. 53400
  7. 43.8
  8. 11.9
  9. 20450
  10. 76.2
  11. 60
  12. 2400
  13. 31.8
  14. 14000
  15. 48000
  16. 29.7
  17. 1600
  18. 60
  19. 30
  20. 60
  21. 45.9
  22. 70
  23. 31.4
  24. 24000
  25. 68100
  26. 1800
  27. 1700
  28. 23.6
  29. 80
  30. 3000
  31. 87000
  32. 70
  33. 45000
  34. 9200
  35. 19000
  36. 79.1
  37. 37.8
  38. 34110
  39. 1100
  40. 32000

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