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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 127 · 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 799 + 597 + 804? (a) 2100 (b) 2300 (c) 2400 (d) 2200
  2. 2.Round 52.22 to one decimal place. =
  3. 3.Which is closest to 401 + 103 + 802? (a) 1500 (b) 1300 (c) 1400 (d) 1200
  4. 4.Round 72986 to the nearest hundred.
  5. 5.Round 41.26 to one decimal place. =
  6. 6.Which is closest to 898 + 597 + 695? (a) 2100 (b) 2400 (c) 2300 (d) 2200
  7. 7.Round 13279 to the nearest ten.
  8. 8.Which is closest to 4507 ÷ 49? (a) 180 (b) 90 (c) 900 (d) 45
  9. 9.Which is closest to 304 × 32? (Round each number first.) (a) 90000 (b) 9000 (c) 18000 (d) 900
  10. 10.Round 72376 to the nearest thousand.
  11. 11.Round 63643 to the nearest thousand.
  12. 12.Which is closest to 702 × 80? (Round each number first.) (a) 5600 (b) 112000 (c) 560000 (d) 56000
  13. 13.Which is closest to 799 + 904 + 701? (a) 2500 (b) 2400 (c) 2600 (d) 2300
  14. 14.Which is closest to 499 × 38? (Round each number first.) (a) 2000 (b) 20000 (c) 200000 (d) 40000
  15. 15.Round 15589 to the nearest thousand.
  16. 16.Which is closest to 2694 ÷ 29? (a) 180 (b) 900 (c) 90 (d) 45
  17. 17.Round 19208 to the nearest ten.
  18. 18.Round 67.66 to one decimal place. =
  19. 19.Which is closest to 303 × 88? (Round each number first.) (a) 2700 (b) 54000 (c) 270000 (d) 27000
  20. 20.Round 31.32 to one decimal place. =
  21. 21.Which is closest to 205 + 805 + 903? (a) 1800 (b) 2100 (c) 1900 (d) 2000
  22. 22.Which is closest to 496 + 202 + 701? (a) 1600 (b) 1400 (c) 1500 (d) 1300
  23. 23.Round 33.08 to one decimal place. =
  24. 24.Round 32145 to the nearest thousand.
  25. 25.Which is closest to 695 + 199 + 396? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  26. 26.Round 95471 to the nearest hundred.
  27. 27.Which is closest to 796 + 805 + 504? (a) 2200 (b) 2100 (c) 2000 (d) 2300
  28. 28.Which is closest to 1205 ÷ 29? (a) 20 (b) 40 (c) 400 (d) 80
  29. 29.Which is closest to 3199 ÷ 39? (a) 800 (b) 160 (c) 80 (d) 40
  30. 30.Which is closest to 199 × 89? (Round each number first.) (a) 180000 (b) 1800 (c) 18000 (d) 36000
  31. 31.Round 45803 to the nearest ten.
  32. 32.Which is closest to 4504 ÷ 49? (a) 90 (b) 45 (c) 900 (d) 180
  33. 33.Round 51.94 to one decimal place. =
  34. 34.Which is closest to 2801 ÷ 39? (a) 70 (b) 700 (c) 140 (d) 35
  35. 35.Which is closest to 1204 ÷ 21? (a) 30 (b) 60 (c) 120 (d) 600
  36. 36.Which is closest to 199 × 60? (Round each number first.) (a) 24000 (b) 120000 (c) 12000 (d) 1200
  37. 37.Which is closest to 803 × 22? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
  38. 38.Round 76.68 to one decimal place. =
  39. 39.Round 94667 to the nearest thousand.
  40. 40.Round 12429 to the nearest ten.

Answer key

  1. 2200
  2. 52.2
  3. 1300
  4. 73000
  5. 41.3
  6. 2200
  7. 13280
  8. 90
  9. 9000
  10. 72000
  11. 64000
  12. 56000
  13. 2400
  14. 20000
  15. 16000
  16. 90
  17. 19210
  18. 67.7
  19. 27000
  20. 31.3
  21. 1900
  22. 1400
  23. 33.1
  24. 32000
  25. 1300
  26. 95500
  27. 2100
  28. 40
  29. 80
  30. 18000
  31. 45800
  32. 90
  33. 51.9
  34. 70
  35. 60
  36. 12000
  37. 16000
  38. 76.7
  39. 95000
  40. 12430

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