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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 203 · 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 11.94 to one decimal place. =
  2. 2.Round 29143 to the nearest hundred.
  3. 3.Which is closest to 2705 ÷ 29? (a) 180 (b) 45 (c) 90 (d) 900
  4. 4.Which is closest to 95 + 602 + 505? (a) 1300 (b) 1200 (c) 1100 (d) 1400
  5. 5.Which is closest to 602 × 81? (Round each number first.) (a) 96000 (b) 48000 (c) 480000 (d) 4800
  6. 6.Which is closest to 500 + 397 + 795? (a) 1800 (b) 1600 (c) 1700 (d) 1900
  7. 7.Which is closest to 204 × 20? (Round each number first.) (a) 8000 (b) 40000 (c) 4000 (d) 400
  8. 8.Round 28.42 to one decimal place. =
  9. 9.Round 48358 to the nearest hundred.
  10. 10.Round 3978 to the nearest hundred.
  11. 11.Round 84.47 to one decimal place. =
  12. 12.Round 37.29 to one decimal place. =
  13. 13.Round 20.86 to one decimal place. =
  14. 14.Round 29964 to the nearest hundred.
  15. 15.Round 21.94 to one decimal place. =
  16. 16.Round 84001 to the nearest hundred.
  17. 17.Round 61.49 to one decimal place. =
  18. 18.Which is closest to 604 × 19? (Round each number first.) (a) 24000 (b) 120000 (c) 12000 (d) 1200
  19. 19.Round 18.77 to one decimal place. =
  20. 20.Which is closest to 701 + 305 + 897? (a) 2000 (b) 1800 (c) 2100 (d) 1900
  21. 21.Round 55737 to the nearest thousand.
  22. 22.Round 61985 to the nearest thousand.
  23. 23.Which is closest to 297 × 40? (Round each number first.) (a) 12000 (b) 1200 (c) 120000 (d) 24000
  24. 24.Round 22.27 to one decimal place. =
  25. 25.Round 80013 to the nearest hundred.
  26. 26.Which is closest to 497 × 72? (Round each number first.) (a) 350000 (b) 3500 (c) 35000 (d) 70000
  27. 27.Round 24.79 to one decimal place. =
  28. 28.Which is closest to 1609 ÷ 41? (a) 400 (b) 80 (c) 20 (d) 40
  29. 29.Which is closest to 503 × 82? (Round each number first.) (a) 400000 (b) 40000 (c) 4000 (d) 80000
  30. 30.Which is closest to 3596 ÷ 41? (a) 180 (b) 45 (c) 90 (d) 900
  31. 31.Round 26076 to the nearest ten.
  32. 32.Round 21.88 to one decimal place. =
  33. 33.Which is closest to 1205 ÷ 39? (a) 300 (b) 15 (c) 60 (d) 30
  34. 34.Round 17.32 to one decimal place. =
  35. 35.Which is closest to 499 + 802 + 305? (a) 1600 (b) 1500 (c) 1700 (d) 1800
  36. 36.Round 58507 to the nearest hundred.
  37. 37.Which is closest to 302 × 38? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  38. 38.Round 46.06 to one decimal place. =
  39. 39.Which is closest to 196 × 28? (Round each number first.) (a) 60000 (b) 6000 (c) 12000 (d) 600
  40. 40.Which is closest to 3503 ÷ 51? (a) 70 (b) 700 (c) 140 (d) 35

Answer key

  1. 11.9
  2. 29100
  3. 90
  4. 1200
  5. 48000
  6. 1700
  7. 4000
  8. 28.4
  9. 48400
  10. 4000
  11. 84.5
  12. 37.3
  13. 20.9
  14. 30000
  15. 21.9
  16. 84000
  17. 61.5
  18. 12000
  19. 18.8
  20. 1900
  21. 56000
  22. 62000
  23. 12000
  24. 22.3
  25. 80000
  26. 35000
  27. 24.8
  28. 40
  29. 40000
  30. 90
  31. 26080
  32. 21.9
  33. 30
  34. 17.3
  35. 1600
  36. 58500
  37. 12000
  38. 46.1
  39. 6000
  40. 70

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