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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 525 · 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 70.29 to one decimal place. =
  2. 2.Which is closest to 505 + 696 + 299? (a) 1600 (b) 1700 (c) 1500 (d) 1400
  3. 3.Round 53829 to the nearest ten.
  4. 4.Which is closest to 1995 ÷ 51? (a) 80 (b) 400 (c) 40 (d) 20
  5. 5.Round 8399 to the nearest ten.
  6. 6.Which is closest to 1501 ÷ 31? (a) 500 (b) 50 (c) 25 (d) 100
  7. 7.Which is closest to 1799 ÷ 21? (a) 45 (b) 180 (c) 90 (d) 900
  8. 8.Which is closest to 696 × 32? (Round each number first.) (a) 42000 (b) 2100 (c) 21000 (d) 210000
  9. 9.Round 31006 to the nearest thousand.
  10. 10.Round 48455 to the nearest hundred.
  11. 11.Round 31.78 to one decimal place. =
  12. 12.Which is closest to 899 × 49? (Round each number first.) (a) 4500 (b) 45000 (c) 450000 (d) 90000
  13. 13.Which is closest to 505 + 602 + 105? (a) 1100 (b) 1400 (c) 1300 (d) 1200
  14. 14.Which is closest to 295 + 399 + 704? (a) 1300 (b) 1500 (c) 1400 (d) 1600
  15. 15.Which is closest to 1807 ÷ 19? (a) 900 (b) 180 (c) 90 (d) 45
  16. 16.Which is closest to 503 + 499 + 202? (a) 1300 (b) 1400 (c) 1200 (d) 1100
  17. 17.Round 85.37 to one decimal place. =
  18. 18.Which is closest to 499 × 41? (Round each number first.) (a) 200000 (b) 2000 (c) 20000 (d) 40000
  19. 19.Which is closest to 601 + 403 + 296? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  20. 20.Which is closest to 599 × 19? (Round each number first.) (a) 12000 (b) 24000 (c) 120000 (d) 1200
  21. 21.Which is closest to 597 + 99 + 198? (a) 1100 (b) 1000 (c) 900 (d) 800
  22. 22.Which is closest to 201 + 799 + 797? (a) 2000 (b) 1700 (c) 1800 (d) 1900
  23. 23.Which is closest to 598 + 701 + 902? (a) 2200 (b) 2300 (c) 2100 (d) 2400
  24. 24.Round 87.87 to one decimal place. =
  25. 25.Which is closest to 796 + 99 + 297? (a) 1300 (b) 1200 (c) 1400 (d) 1100
  26. 26.Which is closest to 697 + 496 + 401? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  27. 27.Round 29961 to the nearest ten.
  28. 28.Which is closest to 602 × 41? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  29. 29.Which is closest to 2491 ÷ 49? (a) 100 (b) 500 (c) 50 (d) 25
  30. 30.Round 14999 to the nearest ten.
  31. 31.Which is closest to 501 × 28? (Round each number first.) (a) 150000 (b) 1500 (c) 30000 (d) 15000
  32. 32.Round 73.31 to one decimal place. =
  33. 33.Which is closest to 499 × 18? (Round each number first.) (a) 100000 (b) 20000 (c) 1000 (d) 10000
  34. 34.Round 57.44 to one decimal place. =
  35. 35.Which is closest to 603 + 604 + 902? (a) 2300 (b) 2000 (c) 2100 (d) 2200
  36. 36.Which is closest to 502 × 18? (Round each number first.) (a) 100000 (b) 10000 (c) 20000 (d) 1000
  37. 37.Which is closest to 799 × 70? (Round each number first.) (a) 560000 (b) 56000 (c) 112000 (d) 5600
  38. 38.Which is closest to 397 + 303 + 202? (a) 1100 (b) 1000 (c) 900 (d) 800
  39. 39.Which is closest to 504 × 22? (Round each number first.) (a) 1000 (b) 10000 (c) 20000 (d) 100000
  40. 40.Which is closest to 605 ÷ 29? (a) 20 (b) 200 (c) 40 (d) 10

Answer key

  1. 70.3
  2. 1500
  3. 53830
  4. 40
  5. 8400
  6. 50
  7. 90
  8. 21000
  9. 31000
  10. 48500
  11. 31.8
  12. 45000
  13. 1200
  14. 1400
  15. 90
  16. 1200
  17. 85.4
  18. 20000
  19. 1300
  20. 12000
  21. 900
  22. 1800
  23. 2200
  24. 87.9
  25. 1200
  26. 1600
  27. 29960
  28. 24000
  29. 50
  30. 15000
  31. 15000
  32. 73.3
  33. 10000
  34. 57.4
  35. 2100
  36. 10000
  37. 56000
  38. 900
  39. 10000
  40. 20

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