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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 497 · 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 2009 ÷ 41? (a) 50 (b) 100 (c) 500 (d) 25
  2. 2.Which is closest to 1195 ÷ 39? (a) 15 (b) 60 (c) 300 (d) 30
  3. 3.Which is closest to 101 + 500 + 199? (a) 1000 (b) 700 (c) 900 (d) 800
  4. 4.Round 7030 to the nearest thousand.
  5. 5.Which is closest to 801 + 395 + 505? (a) 1700 (b) 1900 (c) 1600 (d) 1800
  6. 6.Which is closest to 503 + 398 + 99? (a) 1200 (b) 1000 (c) 1100 (d) 900
  7. 7.Which is closest to 298 × 41? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  8. 8.Which is closest to 898 × 50? (Round each number first.) (a) 90000 (b) 4500 (c) 450000 (d) 45000
  9. 9.Which is closest to 596 × 20? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  10. 10.Which is closest to 497 × 72? (Round each number first.) (a) 35000 (b) 70000 (c) 350000 (d) 3500
  11. 11.Round 45.68 to one decimal place. =
  12. 12.Round 22.08 to one decimal place. =
  13. 13.Which is closest to 395 + 502 + 902? (a) 1700 (b) 1800 (c) 2000 (d) 1900
  14. 14.Round 77.44 to one decimal place. =
  15. 15.Which is closest to 2696 ÷ 29? (a) 180 (b) 90 (c) 45 (d) 900
  16. 16.Which is closest to 395 + 900 + 202? (a) 1700 (b) 1600 (c) 1500 (d) 1400
  17. 17.Which is closest to 2494 ÷ 51? (a) 25 (b) 100 (c) 50 (d) 500
  18. 18.Which is closest to 594 ÷ 29? (a) 10 (b) 20 (c) 200 (d) 40
  19. 19.Which is closest to 3009 ÷ 49? (a) 120 (b) 600 (c) 30 (d) 60
  20. 20.Which is closest to 398 × 59? (Round each number first.) (a) 240000 (b) 48000 (c) 24000 (d) 2400
  21. 21.Round 41.19 to one decimal place. =
  22. 22.Round 17.78 to one decimal place. =
  23. 23.Which is closest to 1191 ÷ 21? (a) 600 (b) 60 (c) 30 (d) 120
  24. 24.Round 96242 to the nearest thousand.
  25. 25.Which is closest to 196 × 29? (Round each number first.) (a) 6000 (b) 600 (c) 60000 (d) 12000
  26. 26.Which is closest to 896 + 605 + 304? (a) 1700 (b) 2000 (c) 1900 (d) 1800
  27. 27.Round 60514 to the nearest ten.
  28. 28.Round 16693 to the nearest hundred.
  29. 29.Round 23.44 to one decimal place. =
  30. 30.Round 19.07 to one decimal place. =
  31. 31.Round 93.08 to one decimal place. =
  32. 32.Round 31141 to the nearest ten.
  33. 33.Which is closest to 1995 ÷ 51? (a) 40 (b) 80 (c) 400 (d) 20
  34. 34.Round 33.17 to one decimal place. =
  35. 35.Which is closest to 698 × 60? (Round each number first.) (a) 4200 (b) 420000 (c) 42000 (d) 84000
  36. 36.Which is closest to 600 × 38? (Round each number first.) (a) 24000 (b) 240000 (c) 48000 (d) 2400
  37. 37.Round 78.49 to one decimal place. =
  38. 38.Which is closest to 2109 ÷ 29? (a) 700 (b) 35 (c) 70 (d) 140
  39. 39.Round 74822 to the nearest ten.
  40. 40.Round 97.36 to one decimal place. =

Answer key

  1. 50
  2. 30
  3. 800
  4. 7000
  5. 1700
  6. 1000
  7. 12000
  8. 45000
  9. 12000
  10. 35000
  11. 45.7
  12. 22.1
  13. 1800
  14. 77.4
  15. 90
  16. 1500
  17. 50
  18. 20
  19. 60
  20. 24000
  21. 41.2
  22. 17.8
  23. 60
  24. 96000
  25. 6000
  26. 1800
  27. 60510
  28. 16700
  29. 23.4
  30. 19.1
  31. 93.1
  32. 31140
  33. 40
  34. 33.2
  35. 42000
  36. 24000
  37. 78.5
  38. 70
  39. 74820
  40. 97.4

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