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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 745 · 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.Round 63.47 to one decimal place. =
  2. 2.Which is closest to 603 + 200 + 895? (a) 1700 (b) 1600 (c) 1900 (d) 1800
  3. 3.Round 24.81 to one decimal place. =
  4. 4.Round 21035 to the nearest thousand.
  5. 5.Round 30011 to the nearest thousand.
  6. 6.Round 20734 to the nearest ten.
  7. 7.Which is closest to 696 × 92? (Round each number first.) (a) 126000 (b) 63000 (c) 6300 (d) 630000
  8. 8.Round 99.83 to one decimal place. =
  9. 9.Round 68.43 to one decimal place. =
  10. 10.Round 62.79 to one decimal place. =
  11. 11.Round 72332 to the nearest thousand.
  12. 12.Round 44.61 to one decimal place. =
  13. 13.Which is closest to 497 × 61? (Round each number first.) (a) 3000 (b) 300000 (c) 60000 (d) 30000
  14. 14.Which is closest to 503 + 404 + 799? (a) 1600 (b) 1700 (c) 1800 (d) 1900
  15. 15.Which is closest to 405 + 599 + 898? (a) 1900 (b) 2000 (c) 1800 (d) 2100
  16. 16.Which is closest to 298 + 496 + 599? (a) 1500 (b) 1400 (c) 1300 (d) 1600
  17. 17.Which is closest to 2100 ÷ 29? (a) 140 (b) 700 (c) 35 (d) 70
  18. 18.Round 64701 to the nearest ten.
  19. 19.Which is closest to 301 + 397 + 898? (a) 1600 (b) 1700 (c) 1800 (d) 1500
  20. 20.Which is closest to 299 × 58? (Round each number first.) (a) 1800 (b) 36000 (c) 18000 (d) 180000
  21. 21.Which is closest to 4498 ÷ 51? (a) 90 (b) 45 (c) 180 (d) 900
  22. 22.Which is closest to 1008 ÷ 49? (a) 200 (b) 20 (c) 10 (d) 40
  23. 23.Which is closest to 2702 ÷ 31? (a) 180 (b) 45 (c) 900 (d) 90
  24. 24.Round 53.72 to one decimal place. =
  25. 25.Which is closest to 902 × 39? (Round each number first.) (a) 72000 (b) 360000 (c) 3600 (d) 36000
  26. 26.Which is closest to 697 + 197 + 104? (a) 1100 (b) 900 (c) 1200 (d) 1000
  27. 27.Round 49615 to the nearest hundred.
  28. 28.Round 71.26 to one decimal place. =
  29. 29.Round 30.91 to one decimal place. =
  30. 30.Round 90.72 to one decimal place. =
  31. 31.Round 91182 to the nearest thousand.
  32. 32.Which is closest to 698 + 596 + 595? (a) 1800 (b) 1900 (c) 2000 (d) 2100
  33. 33.Which is closest to 401 + 701 + 397? (a) 1500 (b) 1600 (c) 1400 (d) 1700
  34. 34.Round 45.29 to one decimal place. =
  35. 35.Which is closest to 1791 ÷ 29? (a) 600 (b) 60 (c) 120 (d) 30
  36. 36.Which is closest to 905 + 103 + 798? (a) 1700 (b) 1900 (c) 2000 (d) 1800
  37. 37.Which is closest to 896 × 68? (Round each number first.) (a) 630000 (b) 126000 (c) 6300 (d) 63000
  38. 38.Which is closest to 396 × 72? (Round each number first.) (a) 56000 (b) 28000 (c) 280000 (d) 2800
  39. 39.Round 24.73 to one decimal place. =
  40. 40.Which is closest to 800 × 19? (Round each number first.) (a) 160000 (b) 1600 (c) 16000 (d) 32000

Answer key

  1. 63.5
  2. 1700
  3. 24.8
  4. 21000
  5. 30000
  6. 20730
  7. 63000
  8. 99.8
  9. 68.4
  10. 62.8
  11. 72000
  12. 44.6
  13. 30000
  14. 1700
  15. 1900
  16. 1400
  17. 70
  18. 64700
  19. 1600
  20. 18000
  21. 90
  22. 20
  23. 90
  24. 53.7
  25. 36000
  26. 1000
  27. 49600
  28. 71.3
  29. 30.9
  30. 90.7
  31. 91000
  32. 1900
  33. 1500
  34. 45.3
  35. 60
  36. 1800
  37. 63000
  38. 28000
  39. 24.7
  40. 16000

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