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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 367 · 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 78.74 to one decimal place. =
  2. 2.Which is closest to 403 × 92? (Round each number first.) (a) 360000 (b) 36000 (c) 3600 (d) 72000
  3. 3.Round 16.58 to one decimal place. =
  4. 4.Which is closest to 97 + 104 + 495? (a) 800 (b) 600 (c) 700 (d) 900
  5. 5.Which is closest to 4497 ÷ 51? (a) 45 (b) 180 (c) 900 (d) 90
  6. 6.Round 56.58 to one decimal place. =
  7. 7.Which is closest to 197 × 88? (Round each number first.) (a) 36000 (b) 18000 (c) 1800 (d) 180000
  8. 8.Round 31.39 to one decimal place. =
  9. 9.Round 86.84 to one decimal place. =
  10. 10.Which is closest to 702 × 92? (Round each number first.) (a) 126000 (b) 6300 (c) 630000 (d) 63000
  11. 11.Which is closest to 202 × 72? (Round each number first.) (a) 1400 (b) 28000 (c) 140000 (d) 14000
  12. 12.Round 28.44 to one decimal place. =
  13. 13.Round 2763 to the nearest hundred.
  14. 14.Which is closest to 898 + 304 + 703? (a) 2100 (b) 1900 (c) 2000 (d) 1800
  15. 15.Round 93.68 to one decimal place. =
  16. 16.Which is closest to 797 + 602 + 401? (a) 1900 (b) 2000 (c) 1700 (d) 1800
  17. 17.Round 88067 to the nearest thousand.
  18. 18.Which is closest to 1196 ÷ 29? (a) 20 (b) 80 (c) 40 (d) 400
  19. 19.Which is closest to 297 × 19? (Round each number first.) (a) 12000 (b) 600 (c) 60000 (d) 6000
  20. 20.Round 80.61 to one decimal place. =
  21. 21.Which is closest to 197 + 805 + 595? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  22. 22.Which is closest to 3202 ÷ 39? (a) 80 (b) 40 (c) 800 (d) 160
  23. 23.Round 44926 to the nearest hundred.
  24. 24.Which is closest to 3601 ÷ 41? (a) 180 (b) 90 (c) 45 (d) 900
  25. 25.Round 36.42 to one decimal place. =
  26. 26.Which is closest to 900 + 901 + 902? (a) 2800 (b) 2900 (c) 2700 (d) 2600
  27. 27.Round 72.72 to one decimal place. =
  28. 28.Which is closest to 402 × 91? (Round each number first.) (a) 36000 (b) 3600 (c) 72000 (d) 360000
  29. 29.Which is closest to 1609 ÷ 19? (a) 160 (b) 40 (c) 80 (d) 800
  30. 30.Which is closest to 903 × 38? (Round each number first.) (a) 360000 (b) 36000 (c) 72000 (d) 3600
  31. 31.Round 17.47 to one decimal place. =
  32. 32.Which is closest to 903 + 297 + 299? (a) 1600 (b) 1500 (c) 1700 (d) 1400
  33. 33.Round 45.82 to one decimal place. =
  34. 34.Round 58740 to the nearest hundred.
  35. 35.Round 65.89 to one decimal place. =
  36. 36.Which is closest to 698 × 81? (Round each number first.) (a) 5600 (b) 560000 (c) 56000 (d) 112000
  37. 37.Which is closest to 198 × 62? (Round each number first.) (a) 24000 (b) 120000 (c) 1200 (d) 12000
  38. 38.Round 7997 to the nearest hundred.
  39. 39.Which is closest to 601 + 798 + 195? (a) 1700 (b) 1600 (c) 1800 (d) 1500
  40. 40.Round 11.54 to one decimal place. =

Answer key

  1. 78.7
  2. 36000
  3. 16.6
  4. 700
  5. 90
  6. 56.6
  7. 18000
  8. 31.4
  9. 86.8
  10. 63000
  11. 14000
  12. 28.4
  13. 2800
  14. 1900
  15. 93.7
  16. 1800
  17. 88000
  18. 40
  19. 6000
  20. 80.6
  21. 1600
  22. 80
  23. 44900
  24. 90
  25. 36.4
  26. 2700
  27. 72.7
  28. 36000
  29. 80
  30. 36000
  31. 17.5
  32. 1500
  33. 45.8
  34. 58700
  35. 65.9
  36. 56000
  37. 12000
  38. 8000
  39. 1600
  40. 11.5

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