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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 333 · 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 603 × 18? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
  2. 2.Which is closest to 205 + 495 + 897? (a) 1500 (b) 1800 (c) 1600 (d) 1700
  3. 3.Which is closest to 898 × 20? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  4. 4.Which is closest to 1205 ÷ 19? (a) 600 (b) 60 (c) 30 (d) 120
  5. 5.Which is closest to 196 + 505 + 197? (a) 1000 (b) 900 (c) 1100 (d) 800
  6. 6.Which is closest to 699 × 81? (Round each number first.) (a) 112000 (b) 5600 (c) 56000 (d) 560000
  7. 7.Which is closest to 700 + 899 + 102? (a) 1800 (b) 1600 (c) 1700 (d) 1900
  8. 8.Which is closest to 403 × 41? (Round each number first.) (a) 32000 (b) 16000 (c) 1600 (d) 160000
  9. 9.Which is closest to 2400 ÷ 39? (a) 60 (b) 120 (c) 600 (d) 30
  10. 10.Which is closest to 803 × 71? (Round each number first.) (a) 56000 (b) 5600 (c) 560000 (d) 112000
  11. 11.Round 44.86 to one decimal place. =
  12. 12.Which is closest to 2095 ÷ 29? (a) 700 (b) 140 (c) 70 (d) 35
  13. 13.Round 93.74 to one decimal place. =
  14. 14.Which is closest to 800 ÷ 41? (a) 40 (b) 200 (c) 20 (d) 10
  15. 15.Round 73131 to the nearest hundred.
  16. 16.Round 92.94 to one decimal place. =
  17. 17.Which is closest to 503 × 92? (Round each number first.) (a) 90000 (b) 4500 (c) 450000 (d) 45000
  18. 18.Round 82.87 to one decimal place. =
  19. 19.Which is closest to 1005 ÷ 49? (a) 20 (b) 200 (c) 40 (d) 10
  20. 20.Round 17.71 to one decimal place. =
  21. 21.Round 22.93 to one decimal place. =
  22. 22.Which is closest to 896 × 71? (Round each number first.) (a) 6300 (b) 630000 (c) 63000 (d) 126000
  23. 23.Round 24382 to the nearest ten.
  24. 24.Round 14.77 to one decimal place. =
  25. 25.Round 83.42 to one decimal place. =
  26. 26.Round 41.77 to one decimal place. =
  27. 27.Round 43.43 to one decimal place. =
  28. 28.Which is closest to 201 × 32? (Round each number first.) (a) 60000 (b) 12000 (c) 6000 (d) 600
  29. 29.Round 65252 to the nearest hundred.
  30. 30.Which is closest to 405 + 505 + 296? (a) 1300 (b) 1200 (c) 1400 (d) 1100
  31. 31.Which is closest to 301 + 697 + 502? (a) 1700 (b) 1400 (c) 1600 (d) 1500
  32. 32.Round 45513 to the nearest ten.
  33. 33.Which is closest to 499 + 302 + 202? (a) 1200 (b) 1100 (c) 1000 (d) 900
  34. 34.Round 5719 to the nearest thousand.
  35. 35.Which is closest to 296 × 88? (Round each number first.) (a) 54000 (b) 27000 (c) 2700 (d) 270000
  36. 36.Which is closest to 801 × 48? (Round each number first.) (a) 400000 (b) 40000 (c) 4000 (d) 80000
  37. 37.Round 45.13 to one decimal place. =
  38. 38.Which is closest to 201 × 20? (Round each number first.) (a) 8000 (b) 4000 (c) 400 (d) 40000
  39. 39.Which is closest to 402 + 903 + 701? (a) 2200 (b) 2100 (c) 1900 (d) 2000
  40. 40.Which is closest to 97 + 95 + 200? (a) 300 (b) 500 (c) 400 (d) 600

Answer key

  1. 12000
  2. 1600
  3. 18000
  4. 60
  5. 900
  6. 56000
  7. 1700
  8. 16000
  9. 60
  10. 56000
  11. 44.9
  12. 70
  13. 93.7
  14. 20
  15. 73100
  16. 92.9
  17. 45000
  18. 82.9
  19. 20
  20. 17.7
  21. 22.9
  22. 63000
  23. 24380
  24. 14.8
  25. 83.4
  26. 41.8
  27. 43.4
  28. 6000
  29. 65300
  30. 1200
  31. 1500
  32. 45510
  33. 1000
  34. 6000
  35. 27000
  36. 40000
  37. 45.1
  38. 4000
  39. 2000
  40. 400

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