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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 911 · 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 499 × 80? (Round each number first.) (a) 4000 (b) 400000 (c) 80000 (d) 40000
  2. 2.Round 36.92 to one decimal place. =
  3. 3.Round 52961 to the nearest ten.
  4. 4.Which is closest to 102 + 396 + 797? (a) 1400 (b) 1500 (c) 1300 (d) 1200
  5. 5.Which is closest to 305 + 201 + 404? (a) 800 (b) 1100 (c) 900 (d) 1000
  6. 6.Which is closest to 204 × 38? (Round each number first.) (a) 800 (b) 16000 (c) 8000 (d) 80000
  7. 7.Which is closest to 395 + 401 + 705? (a) 1700 (b) 1400 (c) 1500 (d) 1600
  8. 8.Which is closest to 605 + 899 + 195? (a) 1800 (b) 1900 (c) 1600 (d) 1700
  9. 9.Which is closest to 397 + 401 + 804? (a) 1600 (b) 1500 (c) 1700 (d) 1800
  10. 10.Round 71.64 to one decimal place. =
  11. 11.Round 36.18 to one decimal place. =
  12. 12.Round 95221 to the nearest hundred.
  13. 13.Round 54.57 to one decimal place. =
  14. 14.Which is closest to 4009 ÷ 51? (a) 160 (b) 80 (c) 40 (d) 800
  15. 15.Round 14.87 to one decimal place. =
  16. 16.Which is closest to 100 + 595 + 197? (a) 1000 (b) 900 (c) 1100 (d) 800
  17. 17.Round 18648 to the nearest hundred.
  18. 18.Round 19.88 to one decimal place. =
  19. 19.Which is closest to 300 × 22? (Round each number first.) (a) 6000 (b) 60000 (c) 12000 (d) 600
  20. 20.Round 26.72 to one decimal place. =
  21. 21.Which is closest to 696 + 604 + 505? (a) 2000 (b) 1700 (c) 1900 (d) 1800
  22. 22.Which is closest to 397 + 300 + 205? (a) 1000 (b) 900 (c) 1100 (d) 800
  23. 23.Which is closest to 702 × 19? (Round each number first.) (a) 1400 (b) 28000 (c) 14000 (d) 140000
  24. 24.Round 82.74 to one decimal place. =
  25. 25.Which is closest to 895 ÷ 31? (a) 60 (b) 15 (c) 30 (d) 300
  26. 26.Round 33.31 to one decimal place. =
  27. 27.Which is closest to 301 × 38? (Round each number first.) (a) 24000 (b) 120000 (c) 12000 (d) 1200
  28. 28.Which is closest to 103 + 299 + 597? (a) 900 (b) 1200 (c) 1000 (d) 1100
  29. 29.Which is closest to 403 + 604 + 797? (a) 1900 (b) 1700 (c) 1800 (d) 2000
  30. 30.Which is closest to 396 × 19? (Round each number first.) (a) 80000 (b) 8000 (c) 16000 (d) 800
  31. 31.Round 19.14 to one decimal place. =
  32. 32.Round 61.84 to one decimal place. =
  33. 33.Which is closest to 897 + 896 + 305? (a) 2300 (b) 2200 (c) 2100 (d) 2000
  34. 34.Which is closest to 3209 ÷ 39? (a) 160 (b) 80 (c) 800 (d) 40
  35. 35.Which is closest to 403 + 95 + 195? (a) 900 (b) 800 (c) 700 (d) 600
  36. 36.Round 16293 to the nearest hundred.
  37. 37.Which is closest to 896 × 40? (Round each number first.) (a) 3600 (b) 36000 (c) 360000 (d) 72000
  38. 38.Which is closest to 1192 ÷ 31? (a) 20 (b) 400 (c) 40 (d) 80
  39. 39.Round 15056 to the nearest thousand.
  40. 40.Which is closest to 599 × 68? (Round each number first.) (a) 420000 (b) 42000 (c) 84000 (d) 4200

Answer key

  1. 40000
  2. 36.9
  3. 52960
  4. 1300
  5. 900
  6. 8000
  7. 1500
  8. 1700
  9. 1600
  10. 71.6
  11. 36.2
  12. 95200
  13. 54.6
  14. 80
  15. 14.9
  16. 900
  17. 18600
  18. 19.9
  19. 6000
  20. 26.7
  21. 1800
  22. 900
  23. 14000
  24. 82.7
  25. 30
  26. 33.3
  27. 12000
  28. 1000
  29. 1800
  30. 8000
  31. 19.1
  32. 61.8
  33. 2100
  34. 80
  35. 700
  36. 16300
  37. 36000
  38. 40
  39. 15000
  40. 42000

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