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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 815 · 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 1003 ÷ 51? (a) 10 (b) 40 (c) 20 (d) 200
  2. 2.Round 29879 to the nearest hundred.
  3. 3.Which is closest to 700 × 22? (Round each number first.) (a) 14000 (b) 140000 (c) 28000 (d) 1400
  4. 4.Round 29499 to the nearest thousand.
  5. 5.Which is closest to 793 ÷ 41? (a) 40 (b) 200 (c) 10 (d) 20
  6. 6.Round 98.74 to one decimal place. =
  7. 7.Round 46.67 to one decimal place. =
  8. 8.Round 77.59 to one decimal place. =
  9. 9.Which is closest to 902 × 29? (Round each number first.) (a) 270000 (b) 54000 (c) 27000 (d) 2700
  10. 10.Which is closest to 799 + 305 + 497? (a) 1600 (b) 1800 (c) 1500 (d) 1700
  11. 11.Which is closest to 696 × 59? (Round each number first.) (a) 84000 (b) 420000 (c) 42000 (d) 4200
  12. 12.Which is closest to 804 ÷ 21? (a) 80 (b) 40 (c) 20 (d) 400
  13. 13.Which is closest to 2506 ÷ 51? (a) 100 (b) 500 (c) 50 (d) 25
  14. 14.Which is closest to 901 × 39? (Round each number first.) (a) 72000 (b) 3600 (c) 360000 (d) 36000
  15. 15.Round 20.58 to one decimal place. =
  16. 16.Which is closest to 697 × 39? (Round each number first.) (a) 280000 (b) 56000 (c) 28000 (d) 2800
  17. 17.Which is closest to 597 + 899 + 700? (a) 2400 (b) 2100 (c) 2300 (d) 2200
  18. 18.Round 52.41 to one decimal place. =
  19. 19.Which is closest to 1997 ÷ 49? (a) 20 (b) 400 (c) 40 (d) 80
  20. 20.Which is closest to 198 × 89? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  21. 21.Which is closest to 797 + 805 + 498? (a) 2300 (b) 2200 (c) 2100 (d) 2000
  22. 22.Which is closest to 603 × 59? (Round each number first.) (a) 3600 (b) 360000 (c) 72000 (d) 36000
  23. 23.Which is closest to 405 + 101 + 901? (a) 1400 (b) 1500 (c) 1600 (d) 1300
  24. 24.Round 22744 to the nearest thousand.
  25. 25.Round 30.89 to one decimal place. =
  26. 26.Which is closest to 502 × 59? (Round each number first.) (a) 300000 (b) 60000 (c) 3000 (d) 30000
  27. 27.Round 18.92 to one decimal place. =
  28. 28.Which is closest to 399 + 299 + 796? (a) 1600 (b) 1700 (c) 1400 (d) 1500
  29. 29.Round 58.83 to one decimal place. =
  30. 30.Which is closest to 301 × 22? (Round each number first.) (a) 12000 (b) 6000 (c) 600 (d) 60000
  31. 31.Which is closest to 604 ÷ 31? (a) 10 (b) 20 (c) 200 (d) 40
  32. 32.Which is closest to 502 × 28? (Round each number first.) (a) 30000 (b) 15000 (c) 150000 (d) 1500
  33. 33.Round 84912 to the nearest thousand.
  34. 34.Round 78.87 to one decimal place. =
  35. 35.Round 47.79 to one decimal place. =
  36. 36.Which is closest to 600 × 51? (Round each number first.) (a) 60000 (b) 3000 (c) 300000 (d) 30000
  37. 37.Round 42.56 to one decimal place. =
  38. 38.Round 10597 to the nearest thousand.
  39. 39.Round 47420 to the nearest hundred.
  40. 40.Round 51768 to the nearest thousand.

Answer key

  1. 20
  2. 29900
  3. 14000
  4. 29000
  5. 20
  6. 98.7
  7. 46.7
  8. 77.6
  9. 27000
  10. 1600
  11. 42000
  12. 40
  13. 50
  14. 36000
  15. 20.6
  16. 28000
  17. 2200
  18. 52.4
  19. 40
  20. 18000
  21. 2100
  22. 36000
  23. 1400
  24. 23000
  25. 30.9
  26. 30000
  27. 18.9
  28. 1500
  29. 58.8
  30. 6000
  31. 20
  32. 15000
  33. 85000
  34. 78.9
  35. 47.8
  36. 30000
  37. 42.6
  38. 11000
  39. 47400
  40. 52000

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