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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 647 · 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 403 ÷ 19? (a) 200 (b) 10 (c) 20 (d) 40
  2. 2.Round 69823 to the nearest hundred.
  3. 3.Which is closest to 2091 ÷ 31? (a) 70 (b) 35 (c) 700 (d) 140
  4. 4.Which is closest to 304 × 90? (Round each number first.) (a) 270000 (b) 2700 (c) 27000 (d) 54000
  5. 5.Round 20.39 to one decimal place. =
  6. 6.Round 54.17 to one decimal place. =
  7. 7.Which is closest to 904 + 403 + 405? (a) 1800 (b) 1600 (c) 1900 (d) 1700
  8. 8.Round 70.47 to one decimal place. =
  9. 9.Which is closest to 196 × 18? (Round each number first.) (a) 4000 (b) 8000 (c) 40000 (d) 400
  10. 10.Round 61.79 to one decimal place. =
  11. 11.Which is closest to 599 × 20? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  12. 12.Which is closest to 2400 ÷ 29? (a) 800 (b) 160 (c) 40 (d) 80
  13. 13.Which is closest to 1206 ÷ 19? (a) 60 (b) 120 (c) 30 (d) 600
  14. 14.Which is closest to 1204 ÷ 21? (a) 30 (b) 60 (c) 120 (d) 600
  15. 15.Round 45.87 to one decimal place. =
  16. 16.Which is closest to 195 + 95 + 900? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  17. 17.Round 74.57 to one decimal place. =
  18. 18.Round 20.36 to one decimal place. =
  19. 19.Which is closest to 1994 ÷ 49? (a) 400 (b) 80 (c) 40 (d) 20
  20. 20.Which is closest to 598 × 30? (Round each number first.) (a) 18000 (b) 180000 (c) 36000 (d) 1800
  21. 21.Which is closest to 201 + 601 + 198? (a) 1100 (b) 900 (c) 1000 (d) 1200
  22. 22.Which is closest to 898 × 22? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  23. 23.Round 58.28 to one decimal place. =
  24. 24.Which is closest to 305 + 900 + 503? (a) 1900 (b) 1700 (c) 1600 (d) 1800
  25. 25.Round 10101 to the nearest hundred.
  26. 26.Round 70.52 to one decimal place. =
  27. 27.Which is closest to 397 × 61? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  28. 28.Round 36.38 to one decimal place. =
  29. 29.Which is closest to 3201 ÷ 39? (a) 800 (b) 80 (c) 40 (d) 160
  30. 30.Round 97899 to the nearest hundred.
  31. 31.Round 56423 to the nearest thousand.
  32. 32.Which is closest to 596 ÷ 19? (a) 15 (b) 60 (c) 300 (d) 30
  33. 33.Which is closest to 1600 ÷ 41? (a) 80 (b) 400 (c) 20 (d) 40
  34. 34.Round 4031 to the nearest hundred.
  35. 35.Which is closest to 502 + 201 + 104? (a) 900 (b) 800 (c) 700 (d) 1000
  36. 36.Which is closest to 598 × 22? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
  37. 37.Which is closest to 1194 ÷ 39? (a) 300 (b) 60 (c) 30 (d) 15
  38. 38.Which is closest to 695 + 199 + 798? (a) 1600 (b) 1700 (c) 1800 (d) 1900
  39. 39.Which is closest to 105 + 200 + 595? (a) 800 (b) 900 (c) 1100 (d) 1000
  40. 40.Which is closest to 896 + 305 + 699? (a) 1800 (b) 1900 (c) 2000 (d) 2100

Answer key

  1. 20
  2. 69800
  3. 70
  4. 27000
  5. 20.4
  6. 54.2
  7. 1700
  8. 70.5
  9. 4000
  10. 61.8
  11. 12000
  12. 80
  13. 60
  14. 60
  15. 45.9
  16. 1200
  17. 74.6
  18. 20.4
  19. 40
  20. 18000
  21. 1000
  22. 18000
  23. 58.3
  24. 1700
  25. 10100
  26. 70.5
  27. 24000
  28. 36.4
  29. 80
  30. 97900
  31. 56000
  32. 30
  33. 40
  34. 4000
  35. 800
  36. 12000
  37. 30
  38. 1700
  39. 900
  40. 1900

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