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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 978 · 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 397 × 49? (Round each number first.) (a) 20000 (b) 40000 (c) 2000 (d) 200000
  2. 2.Which is closest to 897 × 40? (Round each number first.) (a) 72000 (b) 3600 (c) 36000 (d) 360000
  3. 3.Which is closest to 1994 ÷ 51? (a) 20 (b) 40 (c) 80 (d) 400
  4. 4.Which is closest to 1508 ÷ 49? (a) 30 (b) 15 (c) 60 (d) 300
  5. 5.Which is closest to 3999 ÷ 49? (a) 160 (b) 40 (c) 80 (d) 800
  6. 6.Which is closest to 401 × 41? (Round each number first.) (a) 32000 (b) 16000 (c) 160000 (d) 1600
  7. 7.Which is closest to 805 ÷ 19? (a) 400 (b) 80 (c) 40 (d) 20
  8. 8.Round 88.08 to one decimal place. =
  9. 9.Round 76.18 to one decimal place. =
  10. 10.Which is closest to 500 × 39? (Round each number first.) (a) 200000 (b) 20000 (c) 40000 (d) 2000
  11. 11.Round 82.48 to one decimal place. =
  12. 12.Which is closest to 497 × 72? (Round each number first.) (a) 350000 (b) 3500 (c) 35000 (d) 70000
  13. 13.Which is closest to 1606 ÷ 21? (a) 80 (b) 40 (c) 800 (d) 160
  14. 14.Round 27.38 to one decimal place. =
  15. 15.Which is closest to 1600 ÷ 39? (a) 80 (b) 400 (c) 20 (d) 40
  16. 16.Which is closest to 303 × 89? (Round each number first.) (a) 270000 (b) 2700 (c) 27000 (d) 54000
  17. 17.Which is closest to 699 × 68? (Round each number first.) (a) 98000 (b) 490000 (c) 49000 (d) 4900
  18. 18.Round 98746 to the nearest ten.
  19. 19.Round 61055 to the nearest thousand.
  20. 20.Round 85739 to the nearest ten.
  21. 21.Which is closest to 903 × 50? (Round each number first.) (a) 450000 (b) 4500 (c) 90000 (d) 45000
  22. 22.Which is closest to 300 × 18? (Round each number first.) (a) 6000 (b) 600 (c) 12000 (d) 60000
  23. 23.Round 46.82 to one decimal place. =
  24. 24.Round 10785 to the nearest hundred.
  25. 25.Which is closest to 605 + 197 + 805? (a) 1600 (b) 1700 (c) 1500 (d) 1800
  26. 26.Which is closest to 900 × 72? (Round each number first.) (a) 63000 (b) 630000 (c) 126000 (d) 6300
  27. 27.Which is closest to 105 + 903 + 202? (a) 1100 (b) 1400 (c) 1300 (d) 1200
  28. 28.Which is closest to 992 ÷ 51? (a) 20 (b) 40 (c) 200 (d) 10
  29. 29.Round 24428 to the nearest thousand.
  30. 30.Round 8355 to the nearest thousand.
  31. 31.Which is closest to 905 + 302 + 499? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  32. 32.Round 96.89 to one decimal place. =
  33. 33.Round 45964 to the nearest thousand.
  34. 34.Which is closest to 198 × 62? (Round each number first.) (a) 12000 (b) 24000 (c) 1200 (d) 120000
  35. 35.Which is closest to 1399 ÷ 19? (a) 35 (b) 700 (c) 140 (d) 70
  36. 36.Which is closest to 2394 ÷ 31? (a) 80 (b) 160 (c) 800 (d) 40
  37. 37.Round 81785 to the nearest hundred.
  38. 38.Which is closest to 795 ÷ 39? (a) 20 (b) 200 (c) 10 (d) 40
  39. 39.Round 10241 to the nearest ten.
  40. 40.Round 49159 to the nearest ten.

Answer key

  1. 20000
  2. 36000
  3. 40
  4. 30
  5. 80
  6. 16000
  7. 40
  8. 88.1
  9. 76.2
  10. 20000
  11. 82.5
  12. 35000
  13. 80
  14. 27.4
  15. 40
  16. 27000
  17. 49000
  18. 98750
  19. 61000
  20. 85740
  21. 45000
  22. 6000
  23. 46.8
  24. 10800
  25. 1600
  26. 63000
  27. 1200
  28. 20
  29. 24000
  30. 8000
  31. 1700
  32. 96.9
  33. 46000
  34. 12000
  35. 70
  36. 80
  37. 81800
  38. 20
  39. 10240
  40. 49160

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