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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 150 · 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 400 × 91? (Round each number first.) (a) 36000 (b) 72000 (c) 3600 (d) 360000
  2. 2.Which is closest to 600 × 88? (Round each number first.) (a) 540000 (b) 54000 (c) 108000 (d) 5400
  3. 3.Which is closest to 199 + 903 + 700? (a) 1700 (b) 2000 (c) 1800 (d) 1900
  4. 4.Which is closest to 899 ÷ 29? (a) 60 (b) 300 (c) 15 (d) 30
  5. 5.Round 40952 to the nearest ten.
  6. 6.Round 15608 to the nearest hundred.
  7. 7.Which is closest to 903 × 80? (Round each number first.) (a) 720000 (b) 144000 (c) 72000 (d) 7200
  8. 8.Round 54.74 to one decimal place. =
  9. 9.Round 72242 to the nearest ten.
  10. 10.Which is closest to 798 + 505 + 296? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  11. 11.Which is closest to 497 + 796 + 702? (a) 2200 (b) 2000 (c) 1900 (d) 2100
  12. 12.Which is closest to 1497 ÷ 31? (a) 100 (b) 500 (c) 50 (d) 25
  13. 13.Which is closest to 601 + 295 + 400? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  14. 14.Round 99.53 to one decimal place. =
  15. 15.Round 42.49 to one decimal place. =
  16. 16.Which is closest to 2509 ÷ 49? (a) 100 (b) 25 (c) 500 (d) 50
  17. 17.Which is closest to 1494 ÷ 49? (a) 30 (b) 60 (c) 15 (d) 300
  18. 18.Round 57.39 to one decimal place. =
  19. 19.Round 68.29 to one decimal place. =
  20. 20.Which is closest to 497 × 49? (Round each number first.) (a) 50000 (b) 2500 (c) 25000 (d) 250000
  21. 21.Round 17285 to the nearest hundred.
  22. 22.Round 19074 to the nearest thousand.
  23. 23.Which is closest to 403 × 52? (Round each number first.) (a) 2000 (b) 40000 (c) 20000 (d) 200000
  24. 24.Which is closest to 96 + 195 + 300? (a) 500 (b) 700 (c) 800 (d) 600
  25. 25.Round 9841 to the nearest hundred.
  26. 26.Which is closest to 303 × 28? (Round each number first.) (a) 900 (b) 90000 (c) 18000 (d) 9000
  27. 27.Which is closest to 399 × 32? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  28. 28.Which is closest to 2009 ÷ 49? (a) 400 (b) 80 (c) 40 (d) 20
  29. 29.Round 24273 to the nearest ten.
  30. 30.Round 94.51 to one decimal place. =
  31. 31.Round 27022 to the nearest hundred.
  32. 32.Which is closest to 401 × 70? (Round each number first.) (a) 28000 (b) 2800 (c) 280000 (d) 56000
  33. 33.Which is closest to 903 × 19? (Round each number first.) (a) 18000 (b) 36000 (c) 1800 (d) 180000
  34. 34.Round 12.51 to one decimal place. =
  35. 35.Round 25.89 to one decimal place. =
  36. 36.Round 91064 to the nearest hundred.
  37. 37.Which is closest to 600 + 105 + 396? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  38. 38.Which is closest to 203 × 19? (Round each number first.) (a) 400 (b) 4000 (c) 40000 (d) 8000
  39. 39.Which is closest to 1491 ÷ 51? (a) 15 (b) 300 (c) 30 (d) 60
  40. 40.Which is closest to 796 + 401 + 605? (a) 1800 (b) 2000 (c) 1700 (d) 1900

Answer key

  1. 36000
  2. 54000
  3. 1800
  4. 30
  5. 40950
  6. 15600
  7. 72000
  8. 54.7
  9. 72240
  10. 1600
  11. 2000
  12. 50
  13. 1300
  14. 99.5
  15. 42.5
  16. 50
  17. 30
  18. 57.4
  19. 68.3
  20. 25000
  21. 17300
  22. 19000
  23. 20000
  24. 600
  25. 9800
  26. 9000
  27. 12000
  28. 40
  29. 24270
  30. 94.5
  31. 27000
  32. 28000
  33. 18000
  34. 12.5
  35. 25.9
  36. 91100
  37. 1100
  38. 4000
  39. 30
  40. 1800

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