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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 967 · 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 3209 ÷ 39? (a) 160 (b) 800 (c) 40 (d) 80
  2. 2.Round 61.27 to one decimal place. =
  3. 3.Round 79.83 to one decimal place. =
  4. 4.Round 94922 to the nearest ten.
  5. 5.Which is closest to 1809 ÷ 31? (a) 600 (b) 30 (c) 120 (d) 60
  6. 6.Round 71449 to the nearest ten.
  7. 7.Which is closest to 1503 ÷ 49? (a) 300 (b) 30 (c) 15 (d) 60
  8. 8.Which is closest to 1792 ÷ 19? (a) 90 (b) 900 (c) 180 (d) 45
  9. 9.Which is closest to 1209 ÷ 31? (a) 80 (b) 20 (c) 400 (d) 40
  10. 10.Which is closest to 601 + 398 + 498? (a) 1700 (b) 1600 (c) 1500 (d) 1400
  11. 11.Which is closest to 299 + 503 + 198? (a) 1200 (b) 1000 (c) 1100 (d) 900
  12. 12.Which is closest to 1002 ÷ 21? (a) 500 (b) 100 (c) 50 (d) 25
  13. 13.Which is closest to 798 × 19? (Round each number first.) (a) 16000 (b) 32000 (c) 160000 (d) 1600
  14. 14.Which is closest to 198 + 303 + 898? (a) 1500 (b) 1400 (c) 1600 (d) 1300
  15. 15.Round 20.74 to one decimal place. =
  16. 16.Which is closest to 204 × 18? (Round each number first.) (a) 4000 (b) 40000 (c) 400 (d) 8000
  17. 17.Which is closest to 202 × 38? (Round each number first.) (a) 16000 (b) 8000 (c) 80000 (d) 800
  18. 18.Round 25291 to the nearest ten.
  19. 19.Which is closest to 1496 ÷ 29? (a) 50 (b) 25 (c) 500 (d) 100
  20. 20.Round 93661 to the nearest ten.
  21. 21.Round 52567 to the nearest thousand.
  22. 22.Round 48.31 to one decimal place. =
  23. 23.Which is closest to 1593 ÷ 39? (a) 80 (b) 40 (c) 400 (d) 20
  24. 24.Round 39.58 to one decimal place. =
  25. 25.Which is closest to 800 × 82? (Round each number first.) (a) 640000 (b) 64000 (c) 6400 (d) 128000
  26. 26.Which is closest to 604 × 32? (Round each number first.) (a) 36000 (b) 1800 (c) 180000 (d) 18000
  27. 27.Round 52241 to the nearest thousand.
  28. 28.Round 24271 to the nearest hundred.
  29. 29.Which is closest to 595 + 196 + 503? (a) 1500 (b) 1400 (c) 1300 (d) 1200
  30. 30.Which is closest to 700 × 82? (Round each number first.) (a) 112000 (b) 5600 (c) 56000 (d) 560000
  31. 31.Which is closest to 299 × 30? (Round each number first.) (a) 9000 (b) 90000 (c) 900 (d) 18000
  32. 32.Which is closest to 602 × 18? (Round each number first.) (a) 24000 (b) 12000 (c) 1200 (d) 120000
  33. 33.Which is closest to 201 + 303 + 504? (a) 1200 (b) 1000 (c) 1100 (d) 900
  34. 34.Round 78.82 to one decimal place. =
  35. 35.Which is closest to 400 + 199 + 203? (a) 800 (b) 1000 (c) 900 (d) 700
  36. 36.Which is closest to 398 × 58? (Round each number first.) (a) 24000 (b) 48000 (c) 240000 (d) 2400
  37. 37.Which is closest to 197 × 70? (Round each number first.) (a) 1400 (b) 140000 (c) 14000 (d) 28000
  38. 38.Which is closest to 2794 ÷ 41? (a) 140 (b) 700 (c) 35 (d) 70
  39. 39.Which is closest to 403 × 32? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  40. 40.Round 76.43 to one decimal place. =

Answer key

  1. 80
  2. 61.3
  3. 79.8
  4. 94920
  5. 60
  6. 71450
  7. 30
  8. 90
  9. 40
  10. 1500
  11. 1000
  12. 50
  13. 16000
  14. 1400
  15. 20.7
  16. 4000
  17. 8000
  18. 25290
  19. 50
  20. 93660
  21. 53000
  22. 48.3
  23. 40
  24. 39.6
  25. 64000
  26. 18000
  27. 52000
  28. 24300
  29. 1300
  30. 56000
  31. 9000
  32. 12000
  33. 1000
  34. 78.8
  35. 800
  36. 24000
  37. 14000
  38. 70
  39. 12000
  40. 76.4

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