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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 929 · 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 105 + 497 + 395? (a) 900 (b) 1200 (c) 1000 (d) 1100
  2. 2.Which is closest to 302 + 605 + 295? (a) 1400 (b) 1300 (c) 1100 (d) 1200
  3. 3.Which is closest to 398 + 305 + 895? (a) 1600 (b) 1700 (c) 1500 (d) 1800
  4. 4.Which is closest to 502 × 40? (Round each number first.) (a) 20000 (b) 2000 (c) 40000 (d) 200000
  5. 5.Which is closest to 1507 ÷ 51? (a) 300 (b) 60 (c) 15 (d) 30
  6. 6.Round 70414 to the nearest ten.
  7. 7.Round 39102 to the nearest hundred.
  8. 8.Round 24.53 to one decimal place. =
  9. 9.Which is closest to 907 ÷ 31? (a) 300 (b) 60 (c) 15 (d) 30
  10. 10.Round 53.37 to one decimal place. =
  11. 11.Which is closest to 405 ÷ 21? (a) 200 (b) 20 (c) 10 (d) 40
  12. 12.Which is closest to 203 × 58? (Round each number first.) (a) 1200 (b) 24000 (c) 120000 (d) 12000
  13. 13.Which is closest to 303 × 19? (Round each number first.) (a) 12000 (b) 600 (c) 60000 (d) 6000
  14. 14.Which is closest to 903 × 18? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
  15. 15.Round 12.94 to one decimal place. =
  16. 16.Which is closest to 698 × 80? (Round each number first.) (a) 560000 (b) 112000 (c) 5600 (d) 56000
  17. 17.Which is closest to 995 ÷ 21? (a) 500 (b) 100 (c) 25 (d) 50
  18. 18.Which is closest to 2397 ÷ 31? (a) 160 (b) 800 (c) 40 (d) 80
  19. 19.Which is closest to 804 × 70? (Round each number first.) (a) 56000 (b) 5600 (c) 112000 (d) 560000
  20. 20.Round 63.31 to one decimal place. =
  21. 21.Round 29235 to the nearest thousand.
  22. 22.Which is closest to 896 ÷ 31? (a) 15 (b) 60 (c) 300 (d) 30
  23. 23.Which is closest to 398 + 200 + 297? (a) 800 (b) 1000 (c) 1100 (d) 900
  24. 24.Round 51998 to the nearest hundred.
  25. 25.Which is closest to 698 × 52? (Round each number first.) (a) 3500 (b) 70000 (c) 35000 (d) 350000
  26. 26.Which is closest to 596 × 62? (Round each number first.) (a) 72000 (b) 36000 (c) 3600 (d) 360000
  27. 27.Which is closest to 198 × 39? (Round each number first.) (a) 800 (b) 16000 (c) 8000 (d) 80000
  28. 28.Which is closest to 401 × 90? (Round each number first.) (a) 3600 (b) 72000 (c) 360000 (d) 36000
  29. 29.Which is closest to 902 × 70? (Round each number first.) (a) 630000 (b) 6300 (c) 126000 (d) 63000
  30. 30.Round 99266 to the nearest ten.
  31. 31.Round 5593 to the nearest hundred.
  32. 32.Which is closest to 606 ÷ 29? (a) 20 (b) 200 (c) 40 (d) 10
  33. 33.Which is closest to 1502 ÷ 51? (a) 300 (b) 15 (c) 30 (d) 60
  34. 34.Which is closest to 496 × 58? (Round each number first.) (a) 300000 (b) 30000 (c) 60000 (d) 3000
  35. 35.Which is closest to 3001 ÷ 49? (a) 60 (b) 600 (c) 30 (d) 120
  36. 36.Round 94980 to the nearest hundred.
  37. 37.Round 27.43 to one decimal place. =
  38. 38.Round 22.77 to one decimal place. =
  39. 39.Round 10.39 to one decimal place. =
  40. 40.Round 60.21 to one decimal place. =

Answer key

  1. 1000
  2. 1200
  3. 1600
  4. 20000
  5. 30
  6. 70410
  7. 39100
  8. 24.5
  9. 30
  10. 53.4
  11. 20
  12. 12000
  13. 6000
  14. 18000
  15. 12.9
  16. 56000
  17. 50
  18. 80
  19. 56000
  20. 63.3
  21. 29000
  22. 30
  23. 900
  24. 52000
  25. 35000
  26. 36000
  27. 8000
  28. 36000
  29. 63000
  30. 99270
  31. 5600
  32. 20
  33. 30
  34. 30000
  35. 60
  36. 95000
  37. 27.4
  38. 22.8
  39. 10.4
  40. 60.2

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