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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 293 · 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 800 + 796 + 899? (a) 2700 (b) 2400 (c) 2600 (d) 2500
  2. 2.Which is closest to 402 × 19? (Round each number first.) (a) 80000 (b) 16000 (c) 800 (d) 8000
  3. 3.Round 82981 to the nearest thousand.
  4. 4.Which is closest to 197 × 31? (Round each number first.) (a) 6000 (b) 12000 (c) 60000 (d) 600
  5. 5.Which is closest to 697 × 58? (Round each number first.) (a) 4200 (b) 42000 (c) 420000 (d) 84000
  6. 6.Which is closest to 804 ÷ 39? (a) 200 (b) 20 (c) 10 (d) 40
  7. 7.Which is closest to 99 + 796 + 303? (a) 1100 (b) 1300 (c) 1400 (d) 1200
  8. 8.Round 13191 to the nearest thousand.
  9. 9.Which is closest to 995 ÷ 51? (a) 10 (b) 20 (c) 200 (d) 40
  10. 10.Round 46.23 to one decimal place. =
  11. 11.Which is closest to 405 + 503 + 796? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  12. 12.Round 90.32 to one decimal place. =
  13. 13.Which is closest to 3995 ÷ 49? (a) 160 (b) 40 (c) 800 (d) 80
  14. 14.Which is closest to 97 + 896 + 800? (a) 1900 (b) 2000 (c) 1700 (d) 1800
  15. 15.Round 89321 to the nearest thousand.
  16. 16.Which is closest to 300 × 28? (Round each number first.) (a) 18000 (b) 900 (c) 90000 (d) 9000
  17. 17.Which is closest to 396 + 100 + 697? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  18. 18.Which is closest to 701 × 19? (Round each number first.) (a) 1400 (b) 14000 (c) 28000 (d) 140000
  19. 19.Round 17.18 to one decimal place. =
  20. 20.Which is closest to 1194 ÷ 39? (a) 15 (b) 60 (c) 30 (d) 300
  21. 21.Which is closest to 199 × 39? (Round each number first.) (a) 80000 (b) 8000 (c) 16000 (d) 800
  22. 22.Round 79.21 to one decimal place. =
  23. 23.Round 70263 to the nearest thousand.
  24. 24.Which is closest to 901 + 503 + 104? (a) 1400 (b) 1500 (c) 1700 (d) 1600
  25. 25.Which is closest to 199 + 301 + 803? (a) 1500 (b) 1400 (c) 1300 (d) 1200
  26. 26.Round 31.47 to one decimal place. =
  27. 27.Which is closest to 200 × 61? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  28. 28.Round 18.71 to one decimal place. =
  29. 29.Which is closest to 496 × 20? (Round each number first.) (a) 20000 (b) 100000 (c) 1000 (d) 10000
  30. 30.Which is closest to 401 × 68? (Round each number first.) (a) 280000 (b) 28000 (c) 56000 (d) 2800
  31. 31.Which is closest to 398 × 30? (Round each number first.) (a) 120000 (b) 1200 (c) 12000 (d) 24000
  32. 32.Round 43.58 to one decimal place. =
  33. 33.Which is closest to 305 + 401 + 798? (a) 1600 (b) 1400 (c) 1500 (d) 1700
  34. 34.Which is closest to 499 × 60? (Round each number first.) (a) 300000 (b) 3000 (c) 60000 (d) 30000
  35. 35.Round 24130 to the nearest hundred.
  36. 36.Round 31.92 to one decimal place. =
  37. 37.Which is closest to 302 × 51? (Round each number first.) (a) 15000 (b) 1500 (c) 30000 (d) 150000
  38. 38.Which is closest to 596 + 204 + 505? (a) 1300 (b) 1400 (c) 1200 (d) 1500
  39. 39.Which is closest to 299 × 42? (Round each number first.) (a) 1200 (b) 24000 (c) 12000 (d) 120000
  40. 40.Which is closest to 1509 ÷ 49? (a) 300 (b) 15 (c) 60 (d) 30

Answer key

  1. 2500
  2. 8000
  3. 83000
  4. 6000
  5. 42000
  6. 20
  7. 1200
  8. 13000
  9. 20
  10. 46.2
  11. 1700
  12. 90.3
  13. 80
  14. 1800
  15. 89000
  16. 9000
  17. 1200
  18. 14000
  19. 17.2
  20. 30
  21. 8000
  22. 79.2
  23. 70000
  24. 1500
  25. 1300
  26. 31.5
  27. 12000
  28. 18.7
  29. 10000
  30. 28000
  31. 12000
  32. 43.6
  33. 1500
  34. 30000
  35. 24100
  36. 31.9
  37. 15000
  38. 1300
  39. 12000
  40. 30

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