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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 580 · 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 598 × 42? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  2. 2.Round 11695 to the nearest hundred.
  3. 3.Round 43907 to the nearest hundred.
  4. 4.Which is closest to 202 + 902 + 597? (a) 1900 (b) 1700 (c) 1800 (d) 1600
  5. 5.Round 26.79 to one decimal place. =
  6. 6.Round 97414 to the nearest hundred.
  7. 7.Round 18361 to the nearest hundred.
  8. 8.Which is closest to 702 + 199 + 698? (a) 1600 (b) 1500 (c) 1700 (d) 1800
  9. 9.Round 72074 to the nearest ten.
  10. 10.Which is closest to 503 × 78? (Round each number first.) (a) 80000 (b) 400000 (c) 40000 (d) 4000
  11. 11.Which is closest to 1798 ÷ 29? (a) 120 (b) 30 (c) 600 (d) 60
  12. 12.Which is closest to 605 + 503 + 801? (a) 1900 (b) 2100 (c) 2000 (d) 1800
  13. 13.Which is closest to 597 + 396 + 798? (a) 2000 (b) 1800 (c) 1900 (d) 1700
  14. 14.Round 92.38 to one decimal place. =
  15. 15.Which is closest to 696 × 32? (Round each number first.) (a) 42000 (b) 210000 (c) 2100 (d) 21000
  16. 16.Round 72499 to the nearest ten.
  17. 17.Which is closest to 2804 ÷ 39? (a) 700 (b) 70 (c) 140 (d) 35
  18. 18.Which is closest to 704 + 604 + 702? (a) 2000 (b) 2100 (c) 1900 (d) 2200
  19. 19.Round 39.07 to one decimal place. =
  20. 20.Round 81336 to the nearest thousand.
  21. 21.Which is closest to 396 × 48? (Round each number first.) (a) 200000 (b) 20000 (c) 40000 (d) 2000
  22. 22.Which is closest to 301 × 58? (Round each number first.) (a) 180000 (b) 36000 (c) 18000 (d) 1800
  23. 23.Round 16.91 to one decimal place. =
  24. 24.Round 34.44 to one decimal place. =
  25. 25.Which is closest to 602 ÷ 19? (a) 30 (b) 300 (c) 60 (d) 15
  26. 26.Round 77.61 to one decimal place. =
  27. 27.Round 32.64 to one decimal place. =
  28. 28.Which is closest to 297 × 28? (Round each number first.) (a) 18000 (b) 900 (c) 90000 (d) 9000
  29. 29.Which is closest to 806 ÷ 19? (a) 80 (b) 20 (c) 400 (d) 40
  30. 30.Which is closest to 2103 ÷ 29? (a) 140 (b) 70 (c) 35 (d) 700
  31. 31.Which is closest to 901 + 597 + 796? (a) 2500 (b) 2300 (c) 2400 (d) 2200
  32. 32.Round 86774 to the nearest hundred.
  33. 33.Which is closest to 2005 ÷ 39? (a) 100 (b) 50 (c) 500 (d) 25
  34. 34.Which is closest to 499 × 90? (Round each number first.) (a) 4500 (b) 450000 (c) 90000 (d) 45000
  35. 35.Which is closest to 595 ÷ 21? (a) 15 (b) 300 (c) 30 (d) 60
  36. 36.Round 48059 to the nearest hundred.
  37. 37.Which is closest to 505 + 604 + 603? (a) 1800 (b) 1900 (c) 1600 (d) 1700
  38. 38.Which is closest to 397 × 70? (Round each number first.) (a) 56000 (b) 28000 (c) 2800 (d) 280000
  39. 39.Round 24576 to the nearest hundred.
  40. 40.Which is closest to 204 × 49? (Round each number first.) (a) 10000 (b) 100000 (c) 20000 (d) 1000

Answer key

  1. 24000
  2. 11700
  3. 43900
  4. 1700
  5. 26.8
  6. 97400
  7. 18400
  8. 1600
  9. 72070
  10. 40000
  11. 60
  12. 1900
  13. 1800
  14. 92.4
  15. 21000
  16. 72500
  17. 70
  18. 2000
  19. 39.1
  20. 81000
  21. 20000
  22. 18000
  23. 16.9
  24. 34.4
  25. 30
  26. 77.6
  27. 32.6
  28. 9000
  29. 40
  30. 70
  31. 2300
  32. 86800
  33. 50
  34. 45000
  35. 30
  36. 48100
  37. 1700
  38. 28000
  39. 24600
  40. 10000

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