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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 882 · 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.Round 95942 to the nearest ten.
  2. 2.Which is closest to 100 + 405 + 205? (a) 800 (b) 700 (c) 600 (d) 900
  3. 3.Round 86.48 to one decimal place. =
  4. 4.Which is closest to 403 + 703 + 202? (a) 1300 (b) 1200 (c) 1500 (d) 1400
  5. 5.Which is closest to 797 + 703 + 203? (a) 1800 (b) 1600 (c) 1700 (d) 1900
  6. 6.Round 34.08 to one decimal place. =
  7. 7.Which is closest to 497 × 89? (Round each number first.) (a) 45000 (b) 450000 (c) 4500 (d) 90000
  8. 8.Which is closest to 396 × 92? (Round each number first.) (a) 72000 (b) 36000 (c) 3600 (d) 360000
  9. 9.Which is closest to 396 × 58? (Round each number first.) (a) 2400 (b) 48000 (c) 24000 (d) 240000
  10. 10.Which is closest to 704 × 30? (Round each number first.) (a) 2100 (b) 21000 (c) 210000 (d) 42000
  11. 11.Round 34.26 to one decimal place. =
  12. 12.Which is closest to 1495 ÷ 49? (a) 300 (b) 30 (c) 60 (d) 15
  13. 13.Which is closest to 504 × 60? (Round each number first.) (a) 60000 (b) 300000 (c) 30000 (d) 3000
  14. 14.Which is closest to 802 × 28? (Round each number first.) (a) 24000 (b) 240000 (c) 48000 (d) 2400
  15. 15.Round 37.91 to one decimal place. =
  16. 16.Round 73.81 to one decimal place. =
  17. 17.Round 34210 to the nearest thousand.
  18. 18.Which is closest to 1008 ÷ 21? (a) 500 (b) 50 (c) 25 (d) 100
  19. 19.Round 16.87 to one decimal place. =
  20. 20.Round 38.31 to one decimal place. =
  21. 21.Which is closest to 896 + 300 + 601? (a) 2000 (b) 1700 (c) 1900 (d) 1800
  22. 22.Which is closest to 203 × 50? (Round each number first.) (a) 1000 (b) 20000 (c) 10000 (d) 100000
  23. 23.Which is closest to 201 × 30? (Round each number first.) (a) 60000 (b) 6000 (c) 12000 (d) 600
  24. 24.Round 14631 to the nearest hundred.
  25. 25.Which is closest to 3599 ÷ 41? (a) 900 (b) 180 (c) 45 (d) 90
  26. 26.Which is closest to 1995 ÷ 49? (a) 20 (b) 40 (c) 80 (d) 400
  27. 27.Round 73.41 to one decimal place. =
  28. 28.Round 22.08 to one decimal place. =
  29. 29.Which is closest to 895 ÷ 31? (a) 30 (b) 15 (c) 60 (d) 300
  30. 30.Round 20918 to the nearest hundred.
  31. 31.Which is closest to 804 × 89? (Round each number first.) (a) 7200 (b) 720000 (c) 144000 (d) 72000
  32. 32.Round 35017 to the nearest hundred.
  33. 33.Which is closest to 300 × 21? (Round each number first.) (a) 12000 (b) 600 (c) 6000 (d) 60000
  34. 34.Which is closest to 97 + 196 + 405? (a) 800 (b) 900 (c) 600 (d) 700
  35. 35.Round 31.76 to one decimal place. =
  36. 36.Which is closest to 301 × 78? (Round each number first.) (a) 2400 (b) 48000 (c) 240000 (d) 24000
  37. 37.Which is closest to 805 + 496 + 695? (a) 1900 (b) 2200 (c) 2100 (d) 2000
  38. 38.Round 22990 to the nearest hundred.
  39. 39.Round 27.16 to one decimal place. =
  40. 40.Which is closest to 697 × 51? (Round each number first.) (a) 350000 (b) 70000 (c) 3500 (d) 35000

Answer key

  1. 95940
  2. 700
  3. 86.5
  4. 1300
  5. 1700
  6. 34.1
  7. 45000
  8. 36000
  9. 24000
  10. 21000
  11. 34.3
  12. 30
  13. 30000
  14. 24000
  15. 37.9
  16. 73.8
  17. 34000
  18. 50
  19. 16.9
  20. 38.3
  21. 1800
  22. 10000
  23. 6000
  24. 14600
  25. 90
  26. 40
  27. 73.4
  28. 22.1
  29. 30
  30. 20900
  31. 72000
  32. 35000
  33. 6000
  34. 700
  35. 31.8
  36. 24000
  37. 2000
  38. 23000
  39. 27.2
  40. 35000

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