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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 368 · 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 17.26 to one decimal place. =
  2. 2.Which is closest to 1197 ÷ 31? (a) 20 (b) 400 (c) 80 (d) 40
  3. 3.Which is closest to 98 + 895 + 697? (a) 1700 (b) 1900 (c) 1800 (d) 1600
  4. 4.Which is closest to 800 + 503 + 700? (a) 2000 (b) 2200 (c) 1900 (d) 2100
  5. 5.Which is closest to 596 + 104 + 902? (a) 1800 (b) 1500 (c) 1600 (d) 1700
  6. 6.Round 67.21 to one decimal place. =
  7. 7.Which is closest to 197 × 48? (Round each number first.) (a) 20000 (b) 1000 (c) 10000 (d) 100000
  8. 8.Which is closest to 302 + 400 + 401? (a) 1100 (b) 1300 (c) 1200 (d) 1000
  9. 9.Round 47015 to the nearest thousand.
  10. 10.Which is closest to 398 + 97 + 202? (a) 600 (b) 800 (c) 700 (d) 900
  11. 11.Round 51135 to the nearest hundred.
  12. 12.Round 93.83 to one decimal place. =
  13. 13.Round 74323 to the nearest ten.
  14. 14.Which is closest to 1491 ÷ 49? (a) 60 (b) 15 (c) 30 (d) 300
  15. 15.Round 9601 to the nearest ten.
  16. 16.Which is closest to 696 × 52? (Round each number first.) (a) 35000 (b) 70000 (c) 3500 (d) 350000
  17. 17.Round 97454 to the nearest hundred.
  18. 18.Round 71301 to the nearest hundred.
  19. 19.Which is closest to 602 × 59? (Round each number first.) (a) 36000 (b) 360000 (c) 3600 (d) 72000
  20. 20.Round 10.07 to one decimal place. =
  21. 21.Which is closest to 2098 ÷ 29? (a) 700 (b) 70 (c) 35 (d) 140
  22. 22.Which is closest to 2801 ÷ 39? (a) 140 (b) 700 (c) 35 (d) 70
  23. 23.Round 66.59 to one decimal place. =
  24. 24.Which is closest to 796 ÷ 21? (a) 20 (b) 40 (c) 400 (d) 80
  25. 25.Round 33.11 to one decimal place. =
  26. 26.Which is closest to 801 ÷ 39? (a) 40 (b) 200 (c) 10 (d) 20
  27. 27.Round 23483 to the nearest ten.
  28. 28.Round 34.91 to one decimal place. =
  29. 29.Round 70625 to the nearest hundred.
  30. 30.Round 81.11 to one decimal place. =
  31. 31.Round 45.11 to one decimal place. =
  32. 32.Which is closest to 1196 ÷ 29? (a) 400 (b) 80 (c) 20 (d) 40
  33. 33.Round 36.42 to one decimal place. =
  34. 34.Which is closest to 903 + 900 + 404? (a) 2100 (b) 2200 (c) 2400 (d) 2300
  35. 35.Round 60.39 to one decimal place. =
  36. 36.Round 29758 to the nearest thousand.
  37. 37.Round 86.59 to one decimal place. =
  38. 38.Which is closest to 702 × 62? (Round each number first.) (a) 84000 (b) 420000 (c) 42000 (d) 4200
  39. 39.Round 17.49 to one decimal place. =
  40. 40.Which is closest to 899 × 49? (Round each number first.) (a) 4500 (b) 45000 (c) 450000 (d) 90000

Answer key

  1. 17.3
  2. 40
  3. 1700
  4. 2000
  5. 1600
  6. 67.2
  7. 10000
  8. 1100
  9. 47000
  10. 700
  11. 51100
  12. 93.8
  13. 74320
  14. 30
  15. 9600
  16. 35000
  17. 97500
  18. 71300
  19. 36000
  20. 10.1
  21. 70
  22. 70
  23. 66.6
  24. 40
  25. 33.1
  26. 20
  27. 23480
  28. 34.9
  29. 70600
  30. 81.1
  31. 45.1
  32. 40
  33. 36.4
  34. 2200
  35. 60.4
  36. 30000
  37. 86.6
  38. 42000
  39. 17.5
  40. 45000

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