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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 225 · 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 28.47 to one decimal place. =
  2. 2.Round 69.07 to one decimal place. =
  3. 3.Which is closest to 498 × 88? (Round each number first.) (a) 90000 (b) 450000 (c) 4500 (d) 45000
  4. 4.Round 46093 to the nearest hundred.
  5. 5.Round 92963 to the nearest ten.
  6. 6.Round 23.29 to one decimal place. =
  7. 7.Which is closest to 402 × 62? (Round each number first.) (a) 48000 (b) 240000 (c) 2400 (d) 24000
  8. 8.Round 53223 to the nearest ten.
  9. 9.Round 49857 to the nearest hundred.
  10. 10.Round 19.89 to one decimal place. =
  11. 11.Round 52.22 to one decimal place. =
  12. 12.Round 34.81 to one decimal place. =
  13. 13.Which is closest to 803 + 502 + 100? (a) 1600 (b) 1400 (c) 1500 (d) 1300
  14. 14.Which is closest to 398 + 198 + 596? (a) 1100 (b) 1400 (c) 1300 (d) 1200
  15. 15.Round 62.06 to one decimal place. =
  16. 16.Which is closest to 1008 ÷ 49? (a) 200 (b) 20 (c) 40 (d) 10
  17. 17.Which is closest to 201 × 50? (Round each number first.) (a) 20000 (b) 1000 (c) 100000 (d) 10000
  18. 18.Which is closest to 597 + 295 + 304? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  19. 19.Which is closest to 97 + 496 + 698? (a) 1200 (b) 1500 (c) 1300 (d) 1400
  20. 20.Which is closest to 204 + 900 + 98? (a) 1400 (b) 1300 (c) 1100 (d) 1200
  21. 21.Round 15097 to the nearest hundred.
  22. 22.Which is closest to 896 × 31? (Round each number first.) (a) 2700 (b) 27000 (c) 54000 (d) 270000
  23. 23.Round 57.52 to one decimal place. =
  24. 24.Round 81.21 to one decimal place. =
  25. 25.Round 28493 to the nearest thousand.
  26. 26.Which is closest to 495 + 705 + 295? (a) 1400 (b) 1700 (c) 1600 (d) 1500
  27. 27.Round 89.78 to one decimal place. =
  28. 28.Which is closest to 603 + 397 + 701? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  29. 29.Which is closest to 503 + 902 + 496? (a) 1900 (b) 2000 (c) 2100 (d) 1800
  30. 30.Which is closest to 398 × 19? (Round each number first.) (a) 800 (b) 8000 (c) 80000 (d) 16000
  31. 31.Round 20513 to the nearest thousand.
  32. 32.Round 55.68 to one decimal place. =
  33. 33.Which is closest to 3009 ÷ 49? (a) 30 (b) 60 (c) 120 (d) 600
  34. 34.Which is closest to 596 × 58? (Round each number first.) (a) 360000 (b) 36000 (c) 72000 (d) 3600
  35. 35.Round 82.93 to one decimal place. =
  36. 36.Which is closest to 502 × 48? (Round each number first.) (a) 250000 (b) 2500 (c) 25000 (d) 50000
  37. 37.Which is closest to 2098 ÷ 29? (a) 700 (b) 70 (c) 140 (d) 35
  38. 38.Which is closest to 804 × 49? (Round each number first.) (a) 400000 (b) 4000 (c) 40000 (d) 80000
  39. 39.Round 54.39 to one decimal place. =
  40. 40.Round 67.61 to one decimal place. =

Answer key

  1. 28.5
  2. 69.1
  3. 45000
  4. 46100
  5. 92960
  6. 23.3
  7. 24000
  8. 53220
  9. 49900
  10. 19.9
  11. 52.2
  12. 34.8
  13. 1400
  14. 1200
  15. 62.1
  16. 20
  17. 10000
  18. 1200
  19. 1300
  20. 1200
  21. 15100
  22. 27000
  23. 57.5
  24. 81.2
  25. 28000
  26. 1500
  27. 89.8
  28. 1700
  29. 1900
  30. 8000
  31. 21000
  32. 55.7
  33. 60
  34. 36000
  35. 82.9
  36. 25000
  37. 70
  38. 40000
  39. 54.4
  40. 67.6

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