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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 850 · 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 197 + 295 + 398? (a) 1000 (b) 900 (c) 1100 (d) 800
  2. 2.Round 78.06 to one decimal place. =
  3. 3.Round 28774 to the nearest ten.
  4. 4.Which is closest to 901 × 89? (Round each number first.) (a) 810000 (b) 162000 (c) 81000 (d) 8100
  5. 5.Which is closest to 1009 ÷ 19? (a) 500 (b) 50 (c) 25 (d) 100
  6. 6.Which is closest to 501 + 603 + 896? (a) 2000 (b) 1900 (c) 2200 (d) 2100
  7. 7.Round 4781 to the nearest hundred.
  8. 8.Which is closest to 2405 ÷ 29? (a) 80 (b) 800 (c) 160 (d) 40
  9. 9.Round 90779 to the nearest thousand.
  10. 10.Round 96763 to the nearest ten.
  11. 11.Round 51341 to the nearest hundred.
  12. 12.Which is closest to 809 ÷ 21? (a) 20 (b) 40 (c) 400 (d) 80
  13. 13.Round 67.43 to one decimal place. =
  14. 14.Round 57396 to the nearest ten.
  15. 15.Round 38.69 to one decimal place. =
  16. 16.Which is closest to 993 ÷ 49? (a) 200 (b) 10 (c) 40 (d) 20
  17. 17.Which is closest to 97 + 899 + 903? (a) 1800 (b) 1900 (c) 2100 (d) 2000
  18. 18.Round 31334 to the nearest hundred.
  19. 19.Round 85.89 to one decimal place. =
  20. 20.Round 48.39 to one decimal place. =
  21. 21.Round 33.52 to one decimal place. =
  22. 22.Which is closest to 404 + 197 + 603? (a) 1100 (b) 1300 (c) 1400 (d) 1200
  23. 23.Which is closest to 304 × 32? (Round each number first.) (a) 900 (b) 18000 (c) 9000 (d) 90000
  24. 24.Round 18588 to the nearest thousand.
  25. 25.Which is closest to 300 × 31? (Round each number first.) (a) 900 (b) 9000 (c) 18000 (d) 90000
  26. 26.Which is closest to 605 + 796 + 796? (a) 2100 (b) 2400 (c) 2300 (d) 2200
  27. 27.Which is closest to 994 ÷ 21? (a) 25 (b) 500 (c) 100 (d) 50
  28. 28.Round 35.33 to one decimal place. =
  29. 29.Which is closest to 104 + 901 + 896? (a) 2100 (b) 1800 (c) 2000 (d) 1900
  30. 30.Which is closest to 801 + 195 + 799? (a) 1800 (b) 1900 (c) 2000 (d) 1700
  31. 31.Which is closest to 2993 ÷ 49? (a) 600 (b) 120 (c) 60 (d) 30
  32. 32.Which is closest to 195 + 497 + 797? (a) 1400 (b) 1600 (c) 1700 (d) 1500
  33. 33.Round 86.61 to one decimal place. =
  34. 34.Round 30.56 to one decimal place. =
  35. 35.Round 39.07 to one decimal place. =
  36. 36.Which is closest to 796 × 48? (Round each number first.) (a) 400000 (b) 4000 (c) 40000 (d) 80000
  37. 37.Which is closest to 202 × 42? (Round each number first.) (a) 80000 (b) 16000 (c) 8000 (d) 800
  38. 38.Which is closest to 1803 ÷ 21? (a) 45 (b) 900 (c) 90 (d) 180
  39. 39.Which is closest to 699 × 62? (Round each number first.) (a) 84000 (b) 4200 (c) 42000 (d) 420000
  40. 40.Which is closest to 202 + 696 + 299? (a) 1400 (b) 1300 (c) 1200 (d) 1100

Answer key

  1. 900
  2. 78.1
  3. 28770
  4. 81000
  5. 50
  6. 2000
  7. 4800
  8. 80
  9. 91000
  10. 96760
  11. 51300
  12. 40
  13. 67.4
  14. 57400
  15. 38.7
  16. 20
  17. 1900
  18. 31300
  19. 85.9
  20. 48.4
  21. 33.5
  22. 1200
  23. 9000
  24. 19000
  25. 9000
  26. 2200
  27. 50
  28. 35.3
  29. 1900
  30. 1800
  31. 60
  32. 1500
  33. 86.6
  34. 30.6
  35. 39.1
  36. 40000
  37. 8000
  38. 90
  39. 42000
  40. 1200

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