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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 616 · 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 705 + 202 + 196? (a) 1100 (b) 1200 (c) 1000 (d) 1300
  2. 2.Round 34588 to the nearest hundred.
  3. 3.Round 23839 to the nearest ten.
  4. 4.Round 67.56 to one decimal place. =
  5. 5.Which is closest to 302 × 59? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  6. 6.Which is closest to 298 + 703 + 302? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  7. 7.Which is closest to 304 × 58? (Round each number first.) (a) 18000 (b) 36000 (c) 1800 (d) 180000
  8. 8.Round 14285 to the nearest thousand.
  9. 9.Round 56867 to the nearest ten.
  10. 10.Round 73.43 to one decimal place. =
  11. 11.Which is closest to 2701 ÷ 29? (a) 900 (b) 45 (c) 180 (d) 90
  12. 12.Which is closest to 603 × 62? (Round each number first.) (a) 3600 (b) 360000 (c) 36000 (d) 72000
  13. 13.Which is closest to 903 + 804 + 198? (a) 1900 (b) 2000 (c) 1800 (d) 2100
  14. 14.Which is closest to 1806 ÷ 19? (a) 900 (b) 180 (c) 45 (d) 90
  15. 15.Which is closest to 803 + 602 + 605? (a) 1900 (b) 2100 (c) 2000 (d) 2200
  16. 16.Round 4189 to the nearest hundred.
  17. 17.Round 18.94 to one decimal place. =
  18. 18.Round 72.41 to one decimal place. =
  19. 19.Round 51.49 to one decimal place. =
  20. 20.Round 39989 to the nearest thousand.
  21. 21.Which is closest to 396 + 499 + 201? (a) 1100 (b) 1000 (c) 1200 (d) 1300
  22. 22.Round 98.18 to one decimal place. =
  23. 23.Which is closest to 198 × 48? (Round each number first.) (a) 20000 (b) 1000 (c) 10000 (d) 100000
  24. 24.Which is closest to 398 × 61? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  25. 25.Which is closest to 599 × 72? (Round each number first.) (a) 84000 (b) 420000 (c) 42000 (d) 4200
  26. 26.Round 96.24 to one decimal place. =
  27. 27.Which is closest to 99 + 303 + 298? (a) 600 (b) 900 (c) 800 (d) 700
  28. 28.Which is closest to 799 × 82? (Round each number first.) (a) 6400 (b) 128000 (c) 64000 (d) 640000
  29. 29.Round 75607 to the nearest thousand.
  30. 30.Which is closest to 2401 ÷ 39? (a) 120 (b) 600 (c) 60 (d) 30
  31. 31.Which is closest to 1504 ÷ 49? (a) 15 (b) 30 (c) 60 (d) 300
  32. 32.Round 93041 to the nearest thousand.
  33. 33.Round 67.21 to one decimal place. =
  34. 34.Which is closest to 95 + 800 + 703? (a) 1800 (b) 1700 (c) 1600 (d) 1500
  35. 35.Which is closest to 907 ÷ 29? (a) 30 (b) 60 (c) 300 (d) 15
  36. 36.Which is closest to 203 × 19? (Round each number first.) (a) 40000 (b) 400 (c) 4000 (d) 8000
  37. 37.Which is closest to 403 × 30? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  38. 38.Round 28451 to the nearest hundred.
  39. 39.Which is closest to 1801 ÷ 31? (a) 120 (b) 60 (c) 600 (d) 30
  40. 40.Which is closest to 395 + 501 + 495? (a) 1300 (b) 1600 (c) 1400 (d) 1500

Answer key

  1. 1100
  2. 34600
  3. 23840
  4. 67.6
  5. 18000
  6. 1300
  7. 18000
  8. 14000
  9. 56870
  10. 73.4
  11. 90
  12. 36000
  13. 1900
  14. 90
  15. 2000
  16. 4200
  17. 18.9
  18. 72.4
  19. 51.5
  20. 40000
  21. 1100
  22. 98.2
  23. 10000
  24. 24000
  25. 42000
  26. 96.2
  27. 700
  28. 64000
  29. 76000
  30. 60
  31. 30
  32. 93000
  33. 67.2
  34. 1600
  35. 30
  36. 4000
  37. 12000
  38. 28500
  39. 60
  40. 1400

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