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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 24 · 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 503 × 62? (Round each number first.) (a) 30000 (b) 3000 (c) 60000 (d) 300000
  2. 2.Which is closest to 703 × 32? (Round each number first.) (a) 21000 (b) 210000 (c) 2100 (d) 42000
  3. 3.Round 41.78 to one decimal place. =
  4. 4.Which is closest to 1805 ÷ 29? (a) 30 (b) 600 (c) 120 (d) 60
  5. 5.Which is closest to 1195 ÷ 19? (a) 30 (b) 60 (c) 120 (d) 600
  6. 6.Which is closest to 895 + 201 + 496? (a) 1500 (b) 1600 (c) 1800 (d) 1700
  7. 7.Round 25.81 to one decimal place. =
  8. 8.Which is closest to 196 + 899 + 903? (a) 2100 (b) 2000 (c) 1900 (d) 2200
  9. 9.Round 42.69 to one decimal place. =
  10. 10.Which is closest to 696 × 29? (Round each number first.) (a) 210000 (b) 2100 (c) 42000 (d) 21000
  11. 11.Which is closest to 105 + 195 + 304? (a) 800 (b) 600 (c) 500 (d) 700
  12. 12.Which is closest to 597 + 799 + 897? (a) 2500 (b) 2200 (c) 2400 (d) 2300
  13. 13.Which is closest to 702 × 38? (Round each number first.) (a) 28000 (b) 2800 (c) 56000 (d) 280000
  14. 14.Round 54956 to the nearest thousand.
  15. 15.Which is closest to 395 + 500 + 501? (a) 1400 (b) 1500 (c) 1300 (d) 1600
  16. 16.Which is closest to 800 + 796 + 900? (a) 2700 (b) 2500 (c) 2600 (d) 2400
  17. 17.Round 57314 to the nearest ten.
  18. 18.Which is closest to 96 + 195 + 204? (a) 500 (b) 700 (c) 600 (d) 400
  19. 19.Round 19499 to the nearest hundred.
  20. 20.Round 54232 to the nearest hundred.
  21. 21.Round 60.32 to one decimal place. =
  22. 22.Round 46.77 to one decimal place. =
  23. 23.Which is closest to 298 × 52? (Round each number first.) (a) 1500 (b) 30000 (c) 150000 (d) 15000
  24. 24.Round 28570 to the nearest hundred.
  25. 25.Round 1697 to the nearest hundred.
  26. 26.Round 20763 to the nearest ten.
  27. 27.Round 81779 to the nearest hundred.
  28. 28.Round 94667 to the nearest thousand.
  29. 29.Which is closest to 597 + 599 + 399? (a) 1500 (b) 1800 (c) 1700 (d) 1600
  30. 30.Which is closest to 3591 ÷ 41? (a) 900 (b) 180 (c) 45 (d) 90
  31. 31.Round 33998 to the nearest thousand.
  32. 32.Which is closest to 599 × 20? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
  33. 33.Which is closest to 901 × 22? (Round each number first.) (a) 180000 (b) 36000 (c) 1800 (d) 18000
  34. 34.Which is closest to 297 × 39? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
  35. 35.Which is closest to 597 × 70? (Round each number first.) (a) 420000 (b) 42000 (c) 4200 (d) 84000
  36. 36.Round 67.83 to one decimal place. =
  37. 37.Which is closest to 802 ÷ 41? (a) 40 (b) 20 (c) 10 (d) 200
  38. 38.Round 65.08 to one decimal place. =
  39. 39.Which is closest to 601 × 39? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  40. 40.Which is closest to 397 × 58? (Round each number first.) (a) 24000 (b) 48000 (c) 2400 (d) 240000

Answer key

  1. 30000
  2. 21000
  3. 41.8
  4. 60
  5. 60
  6. 1600
  7. 25.8
  8. 2000
  9. 42.7
  10. 21000
  11. 600
  12. 2300
  13. 28000
  14. 55000
  15. 1400
  16. 2500
  17. 57310
  18. 500
  19. 19500
  20. 54200
  21. 60.3
  22. 46.8
  23. 15000
  24. 28600
  25. 1700
  26. 20760
  27. 81800
  28. 95000
  29. 1600
  30. 90
  31. 34000
  32. 12000
  33. 18000
  34. 12000
  35. 42000
  36. 67.8
  37. 20
  38. 65.1
  39. 24000
  40. 24000

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