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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 768 · 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 796 × 68? (Round each number first.) (a) 560000 (b) 112000 (c) 5600 (d) 56000
  2. 2.Round 64.51 to one decimal place. =
  3. 3.Round 6516 to the nearest hundred.
  4. 4.Which is closest to 591 ÷ 19? (a) 30 (b) 60 (c) 300 (d) 15
  5. 5.Which is closest to 704 × 19? (Round each number first.) (a) 140000 (b) 1400 (c) 28000 (d) 14000
  6. 6.Which is closest to 498 + 902 + 405? (a) 1900 (b) 2000 (c) 1700 (d) 1800
  7. 7.Round 15.08 to one decimal place. =
  8. 8.Which is closest to 199 × 30? (Round each number first.) (a) 600 (b) 12000 (c) 6000 (d) 60000
  9. 9.Round 13914 to the nearest hundred.
  10. 10.Which is closest to 596 + 800 + 199? (a) 1600 (b) 1800 (c) 1500 (d) 1700
  11. 11.Which is closest to 902 × 30? (Round each number first.) (a) 270000 (b) 54000 (c) 2700 (d) 27000
  12. 12.Which is closest to 202 + 200 + 502? (a) 1100 (b) 800 (c) 900 (d) 1000
  13. 13.Which is closest to 500 × 41? (Round each number first.) (a) 200000 (b) 40000 (c) 2000 (d) 20000
  14. 14.Round 46.68 to one decimal place. =
  15. 15.Which is closest to 501 × 21? (Round each number first.) (a) 20000 (b) 100000 (c) 10000 (d) 1000
  16. 16.Which is closest to 504 × 32? (Round each number first.) (a) 1500 (b) 15000 (c) 150000 (d) 30000
  17. 17.Round 27146 to the nearest ten.
  18. 18.Round 27.89 to one decimal place. =
  19. 19.Round 67.46 to one decimal place. =
  20. 20.Which is closest to 602 + 705 + 399? (a) 1700 (b) 1800 (c) 1600 (d) 1900
  21. 21.Which is closest to 498 × 30? (Round each number first.) (a) 15000 (b) 150000 (c) 1500 (d) 30000
  22. 22.Which is closest to 598 × 70? (Round each number first.) (a) 84000 (b) 42000 (c) 4200 (d) 420000
  23. 23.Which is closest to 499 + 498 + 698? (a) 1900 (b) 1600 (c) 1700 (d) 1800
  24. 24.Round 36221 to the nearest thousand.
  25. 25.Round 21.64 to one decimal place. =
  26. 26.Round 72.73 to one decimal place. =
  27. 27.Which is closest to 2007 ÷ 51? (a) 400 (b) 20 (c) 80 (d) 40
  28. 28.Which is closest to 991 ÷ 49? (a) 40 (b) 10 (c) 200 (d) 20
  29. 29.Round 10839 to the nearest ten.
  30. 30.Round 63.88 to one decimal place. =
  31. 31.Which is closest to 795 + 97 + 196? (a) 1000 (b) 1100 (c) 1300 (d) 1200
  32. 32.Which is closest to 1593 ÷ 21? (a) 40 (b) 800 (c) 160 (d) 80
  33. 33.Which is closest to 1508 ÷ 49? (a) 15 (b) 300 (c) 60 (d) 30
  34. 34.Round 74.22 to one decimal place. =
  35. 35.Which is closest to 904 + 598 + 97? (a) 1700 (b) 1800 (c) 1600 (d) 1500
  36. 36.Which is closest to 296 × 90? (Round each number first.) (a) 27000 (b) 54000 (c) 270000 (d) 2700
  37. 37.Which is closest to 896 + 101 + 497? (a) 1700 (b) 1500 (c) 1400 (d) 1600
  38. 38.Which is closest to 1797 ÷ 29? (a) 120 (b) 60 (c) 600 (d) 30
  39. 39.Which is closest to 699 × 89? (Round each number first.) (a) 126000 (b) 6300 (c) 630000 (d) 63000
  40. 40.Which is closest to 296 × 19? (Round each number first.) (a) 60000 (b) 600 (c) 6000 (d) 12000

Answer key

  1. 56000
  2. 64.5
  3. 6500
  4. 30
  5. 14000
  6. 1800
  7. 15.1
  8. 6000
  9. 13900
  10. 1600
  11. 27000
  12. 900
  13. 20000
  14. 46.7
  15. 10000
  16. 15000
  17. 27150
  18. 27.9
  19. 67.5
  20. 1700
  21. 15000
  22. 42000
  23. 1700
  24. 36000
  25. 21.6
  26. 72.7
  27. 40
  28. 20
  29. 10840
  30. 63.9
  31. 1100
  32. 80
  33. 30
  34. 74.2
  35. 1600
  36. 27000
  37. 1500
  38. 60
  39. 63000
  40. 6000

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