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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 99 · 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 205 + 405 + 196? (a) 700 (b) 900 (c) 1000 (d) 800
  2. 2.Which is closest to 1493 ÷ 49? (a) 60 (b) 300 (c) 30 (d) 15
  3. 3.Round 58.62 to one decimal place. =
  4. 4.Which is closest to 299 × 58? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  5. 5.Which is closest to 395 + 902 + 900? (a) 2100 (b) 2300 (c) 2400 (d) 2200
  6. 6.Which is closest to 1596 ÷ 39? (a) 20 (b) 40 (c) 400 (d) 80
  7. 7.Which is closest to 801 × 30? (Round each number first.) (a) 240000 (b) 48000 (c) 24000 (d) 2400
  8. 8.Which is closest to 798 × 58? (Round each number first.) (a) 48000 (b) 96000 (c) 480000 (d) 4800
  9. 9.Round 61.41 to one decimal place. =
  10. 10.Which is closest to 808 ÷ 21? (a) 20 (b) 400 (c) 40 (d) 80
  11. 11.Which is closest to 195 + 98 + 404? (a) 800 (b) 700 (c) 900 (d) 600
  12. 12.Round 57017 to the nearest thousand.
  13. 13.Which is closest to 101 + 105 + 605? (a) 700 (b) 1000 (c) 800 (d) 900
  14. 14.Round 60918 to the nearest thousand.
  15. 15.Which is closest to 802 × 82? (Round each number first.) (a) 640000 (b) 6400 (c) 128000 (d) 64000
  16. 16.Which is closest to 1493 ÷ 51? (a) 15 (b) 300 (c) 30 (d) 60
  17. 17.Round 47203 to the nearest thousand.
  18. 18.Which is closest to 1497 ÷ 31? (a) 25 (b) 500 (c) 50 (d) 100
  19. 19.Round 78.28 to one decimal place. =
  20. 20.Round 70.07 to one decimal place. =
  21. 21.Round 5696 to the nearest ten.
  22. 22.Which is closest to 500 × 41? (Round each number first.) (a) 40000 (b) 2000 (c) 200000 (d) 20000
  23. 23.Round 52.49 to one decimal place. =
  24. 24.Which is closest to 396 × 21? (Round each number first.) (a) 800 (b) 16000 (c) 80000 (d) 8000
  25. 25.Round 90583 to the nearest thousand.
  26. 26.Round 66536 to the nearest hundred.
  27. 27.Which is closest to 801 + 597 + 201? (a) 1800 (b) 1600 (c) 1700 (d) 1500
  28. 28.Which is closest to 903 × 82? (Round each number first.) (a) 7200 (b) 72000 (c) 720000 (d) 144000
  29. 29.Round 48.41 to one decimal place. =
  30. 30.Which is closest to 800 ÷ 39? (a) 200 (b) 20 (c) 10 (d) 40
  31. 31.Round 61714 to the nearest hundred.
  32. 32.Which is closest to 699 × 28? (Round each number first.) (a) 210000 (b) 42000 (c) 2100 (d) 21000
  33. 33.Which is closest to 4505 ÷ 51? (a) 45 (b) 90 (c) 900 (d) 180
  34. 34.Which is closest to 809 ÷ 21? (a) 80 (b) 20 (c) 400 (d) 40
  35. 35.Which is closest to 501 + 903 + 403? (a) 1900 (b) 1700 (c) 2000 (d) 1800
  36. 36.Round 90.13 to one decimal place. =
  37. 37.Round 35703 to the nearest thousand.
  38. 38.Which is closest to 496 × 69? (Round each number first.) (a) 35000 (b) 350000 (c) 70000 (d) 3500
  39. 39.Round 78245 to the nearest thousand.
  40. 40.Which is closest to 896 × 18? (Round each number first.) (a) 1800 (b) 18000 (c) 36000 (d) 180000

Answer key

  1. 800
  2. 30
  3. 58.6
  4. 18000
  5. 2200
  6. 40
  7. 24000
  8. 48000
  9. 61.4
  10. 40
  11. 700
  12. 57000
  13. 800
  14. 61000
  15. 64000
  16. 30
  17. 47000
  18. 50
  19. 78.3
  20. 70.1
  21. 5700
  22. 20000
  23. 52.5
  24. 8000
  25. 91000
  26. 66500
  27. 1600
  28. 72000
  29. 48.4
  30. 20
  31. 61700
  32. 21000
  33. 90
  34. 40
  35. 1800
  36. 90.1
  37. 36000
  38. 35000
  39. 78000
  40. 18000

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