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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 657 · 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 902 × 80? (Round each number first.) (a) 144000 (b) 72000 (c) 7200 (d) 720000
  2. 2.Round 50.71 to one decimal place. =
  3. 3.Which is closest to 898 × 89? (Round each number first.) (a) 810000 (b) 162000 (c) 8100 (d) 81000
  4. 4.Round 34.52 to one decimal place. =
  5. 5.Round 83860 to the nearest hundred.
  6. 6.Which is closest to 504 × 90? (Round each number first.) (a) 90000 (b) 450000 (c) 4500 (d) 45000
  7. 7.Round 72838 to the nearest thousand.
  8. 8.Round 67743 to the nearest ten.
  9. 9.Which is closest to 2009 ÷ 51? (a) 400 (b) 40 (c) 80 (d) 20
  10. 10.Round 3159 to the nearest thousand.
  11. 11.Which is closest to 2397 ÷ 39? (a) 120 (b) 60 (c) 600 (d) 30
  12. 12.Round 93.89 to one decimal place. =
  13. 13.Which is closest to 497 × 88? (Round each number first.) (a) 90000 (b) 45000 (c) 4500 (d) 450000
  14. 14.Which is closest to 503 × 59? (Round each number first.) (a) 60000 (b) 300000 (c) 30000 (d) 3000
  15. 15.Round 53624 to the nearest thousand.
  16. 16.Which is closest to 905 + 95 + 705? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  17. 17.Round 68.09 to one decimal place. =
  18. 18.Round 73.29 to one decimal place. =
  19. 19.Which is closest to 102 + 599 + 505? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  20. 20.Round 62142 to the nearest hundred.
  21. 21.Round 26318 to the nearest hundred.
  22. 22.Round 63561 to the nearest hundred.
  23. 23.Which is closest to 596 × 22? (Round each number first.) (a) 1200 (b) 12000 (c) 120000 (d) 24000
  24. 24.Round 26.32 to one decimal place. =
  25. 25.Round 19.78 to one decimal place. =
  26. 26.Which is closest to 1200 ÷ 21? (a) 120 (b) 30 (c) 60 (d) 600
  27. 27.Which is closest to 902 × 81? (Round each number first.) (a) 720000 (b) 144000 (c) 72000 (d) 7200
  28. 28.Round 81475 to the nearest hundred.
  29. 29.Which is closest to 103 + 596 + 198? (a) 1000 (b) 1100 (c) 900 (d) 800
  30. 30.Round 39.46 to one decimal place. =
  31. 31.Which is closest to 196 × 90? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
  32. 32.Which is closest to 105 + 701 + 602? (a) 1300 (b) 1500 (c) 1600 (d) 1400
  33. 33.Round 92.77 to one decimal place. =
  34. 34.Round 46135 to the nearest hundred.
  35. 35.Which is closest to 901 + 796 + 104? (a) 1800 (b) 2000 (c) 1700 (d) 1900
  36. 36.Which is closest to 800 + 803 + 299? (a) 2000 (b) 1900 (c) 1800 (d) 2100
  37. 37.Which is closest to 1802 ÷ 21? (a) 45 (b) 900 (c) 90 (d) 180
  38. 38.Round 95.66 to one decimal place. =
  39. 39.Round 50885 to the nearest hundred.
  40. 40.Which is closest to 906 ÷ 29? (a) 60 (b) 300 (c) 15 (d) 30

Answer key

  1. 72000
  2. 50.7
  3. 81000
  4. 34.5
  5. 83900
  6. 45000
  7. 73000
  8. 67740
  9. 40
  10. 3000
  11. 60
  12. 93.9
  13. 45000
  14. 30000
  15. 54000
  16. 1700
  17. 68.1
  18. 73.3
  19. 1200
  20. 62100
  21. 26300
  22. 63600
  23. 12000
  24. 26.3
  25. 19.8
  26. 60
  27. 72000
  28. 81500
  29. 900
  30. 39.5
  31. 18000
  32. 1400
  33. 92.8
  34. 46100
  35. 1800
  36. 1900
  37. 90
  38. 95.7
  39. 50900
  40. 30

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