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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 897 · 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 93548 to the nearest hundred.
  2. 2.Which is closest to 696 × 79? (Round each number first.) (a) 560000 (b) 5600 (c) 56000 (d) 112000
  3. 3.Round 85.92 to one decimal place. =
  4. 4.Round 88.81 to one decimal place. =
  5. 5.Which is closest to 402 + 105 + 103? (a) 600 (b) 700 (c) 800 (d) 500
  6. 6.Which is closest to 697 + 899 + 498? (a) 2000 (b) 2200 (c) 2300 (d) 2100
  7. 7.Round 75.38 to one decimal place. =
  8. 8.Round 24.67 to one decimal place. =
  9. 9.Which is closest to 599 ÷ 31? (a) 200 (b) 40 (c) 10 (d) 20
  10. 10.Which is closest to 2102 ÷ 31? (a) 70 (b) 700 (c) 35 (d) 140
  11. 11.Which is closest to 1806 ÷ 31? (a) 120 (b) 60 (c) 30 (d) 600
  12. 12.Round 55637 to the nearest ten.
  13. 13.Which is closest to 405 + 796 + 596? (a) 1800 (b) 1700 (c) 1900 (d) 2000
  14. 14.Round 19344 to the nearest ten.
  15. 15.Which is closest to 904 + 97 + 897? (a) 2100 (b) 2000 (c) 1800 (d) 1900
  16. 16.Which is closest to 903 + 400 + 898? (a) 2300 (b) 2400 (c) 2200 (d) 2100
  17. 17.Round 87643 to the nearest ten.
  18. 18.Which is closest to 904 × 32? (Round each number first.) (a) 270000 (b) 54000 (c) 27000 (d) 2700
  19. 19.Round 43.66 to one decimal place. =
  20. 20.Which is closest to 198 × 91? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
  21. 21.Which is closest to 202 + 302 + 401? (a) 900 (b) 1100 (c) 800 (d) 1000
  22. 22.Which is closest to 495 + 402 + 100? (a) 1000 (b) 1200 (c) 1100 (d) 900
  23. 23.Which is closest to 2703 ÷ 29? (a) 900 (b) 180 (c) 45 (d) 90
  24. 24.Round 49874 to the nearest hundred.
  25. 25.Round 71.87 to one decimal place. =
  26. 26.Which is closest to 898 × 20? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  27. 27.Round 82.26 to one decimal place. =
  28. 28.Which is closest to 598 × 18? (Round each number first.) (a) 24000 (b) 12000 (c) 1200 (d) 120000
  29. 29.Which is closest to 902 × 79? (Round each number first.) (a) 72000 (b) 7200 (c) 144000 (d) 720000
  30. 30.Round 51.72 to one decimal place. =
  31. 31.Which is closest to 495 + 895 + 499? (a) 1900 (b) 1800 (c) 2100 (d) 2000
  32. 32.Round 47.51 to one decimal place. =
  33. 33.Which is closest to 597 × 48? (Round each number first.) (a) 3000 (b) 30000 (c) 60000 (d) 300000
  34. 34.Round 76.63 to one decimal place. =
  35. 35.Which is closest to 993 ÷ 21? (a) 50 (b) 500 (c) 25 (d) 100
  36. 36.Which is closest to 902 × 89? (Round each number first.) (a) 8100 (b) 810000 (c) 162000 (d) 81000
  37. 37.Round 89494 to the nearest ten.
  38. 38.Which is closest to 996 ÷ 49? (a) 20 (b) 10 (c) 40 (d) 200
  39. 39.Which is closest to 698 × 59? (Round each number first.) (a) 42000 (b) 420000 (c) 4200 (d) 84000
  40. 40.Which is closest to 900 × 62? (Round each number first.) (a) 108000 (b) 5400 (c) 540000 (d) 54000

Answer key

  1. 93500
  2. 56000
  3. 85.9
  4. 88.8
  5. 600
  6. 2100
  7. 75.4
  8. 24.7
  9. 20
  10. 70
  11. 60
  12. 55640
  13. 1800
  14. 19340
  15. 1900
  16. 2200
  17. 87640
  18. 27000
  19. 43.7
  20. 18000
  21. 900
  22. 1000
  23. 90
  24. 49900
  25. 71.9
  26. 18000
  27. 82.3
  28. 12000
  29. 72000
  30. 51.7
  31. 1900
  32. 47.5
  33. 30000
  34. 76.6
  35. 50
  36. 81000
  37. 89490
  38. 20
  39. 42000
  40. 54000

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