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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 512 · 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 599 ÷ 31? (a) 40 (b) 10 (c) 200 (d) 20
  2. 2.Round 90727 to the nearest thousand.
  3. 3.Which is closest to 397 × 81? (Round each number first.) (a) 3200 (b) 320000 (c) 64000 (d) 32000
  4. 4.Which is closest to 3507 ÷ 49? (a) 140 (b) 70 (c) 35 (d) 700
  5. 5.Which is closest to 804 + 405 + 498? (a) 1900 (b) 1700 (c) 1600 (d) 1800
  6. 6.Which is closest to 397 + 696 + 600? (a) 1700 (b) 1800 (c) 1900 (d) 1600
  7. 7.Which is closest to 902 × 22? (Round each number first.) (a) 18000 (b) 36000 (c) 180000 (d) 1800
  8. 8.Round 45486 to the nearest thousand.
  9. 9.Which is closest to 1205 ÷ 19? (a) 120 (b) 60 (c) 600 (d) 30
  10. 10.Which is closest to 399 × 21? (Round each number first.) (a) 80000 (b) 800 (c) 8000 (d) 16000
  11. 11.Which is closest to 1591 ÷ 39? (a) 80 (b) 40 (c) 20 (d) 400
  12. 12.Which is closest to 97 + 499 + 301? (a) 1100 (b) 900 (c) 1000 (d) 800
  13. 13.Which is closest to 401 × 39? (Round each number first.) (a) 32000 (b) 1600 (c) 16000 (d) 160000
  14. 14.Round 21536 to the nearest hundred.
  15. 15.Which is closest to 1791 ÷ 21? (a) 900 (b) 180 (c) 45 (d) 90
  16. 16.Round 89.43 to one decimal place. =
  17. 17.Which is closest to 603 × 18? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  18. 18.Which is closest to 200 × 61? (Round each number first.) (a) 12000 (b) 1200 (c) 120000 (d) 24000
  19. 19.Which is closest to 505 + 601 + 398? (a) 1600 (b) 1400 (c) 1500 (d) 1700
  20. 20.Round 21.31 to one decimal place. =
  21. 21.Which is closest to 197 × 82? (Round each number first.) (a) 160000 (b) 32000 (c) 16000 (d) 1600
  22. 22.Which is closest to 296 × 88? (Round each number first.) (a) 54000 (b) 270000 (c) 2700 (d) 27000
  23. 23.Which is closest to 804 ÷ 19? (a) 20 (b) 400 (c) 80 (d) 40
  24. 24.Which is closest to 700 + 496 + 504? (a) 1900 (b) 1700 (c) 1800 (d) 1600
  25. 25.Which is closest to 203 × 82? (Round each number first.) (a) 1600 (b) 32000 (c) 16000 (d) 160000
  26. 26.Round 77.79 to one decimal place. =
  27. 27.Round 33734 to the nearest hundred.
  28. 28.Round 50.19 to one decimal place. =
  29. 29.Which is closest to 804 × 52? (Round each number first.) (a) 80000 (b) 40000 (c) 4000 (d) 400000
  30. 30.Which is closest to 1591 ÷ 41? (a) 80 (b) 20 (c) 400 (d) 40
  31. 31.Round 42.24 to one decimal place. =
  32. 32.Which is closest to 795 + 401 + 202? (a) 1300 (b) 1400 (c) 1600 (d) 1500
  33. 33.Round 40109 to the nearest hundred.
  34. 34.Which is closest to 803 + 704 + 197? (a) 1900 (b) 1600 (c) 1800 (d) 1700
  35. 35.Which is closest to 203 + 905 + 100? (a) 1100 (b) 1400 (c) 1300 (d) 1200
  36. 36.Which is closest to 2400 ÷ 41? (a) 120 (b) 60 (c) 30 (d) 600
  37. 37.Which is closest to 798 × 49? (Round each number first.) (a) 80000 (b) 400000 (c) 40000 (d) 4000
  38. 38.Which is closest to 904 + 203 + 202? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  39. 39.Round 14.27 to one decimal place. =
  40. 40.Which is closest to 598 × 32? (Round each number first.) (a) 36000 (b) 180000 (c) 18000 (d) 1800

Answer key

  1. 20
  2. 91000
  3. 32000
  4. 70
  5. 1700
  6. 1700
  7. 18000
  8. 45000
  9. 60
  10. 8000
  11. 40
  12. 900
  13. 16000
  14. 21500
  15. 90
  16. 89.4
  17. 12000
  18. 12000
  19. 1500
  20. 21.3
  21. 16000
  22. 27000
  23. 40
  24. 1700
  25. 16000
  26. 77.8
  27. 33700
  28. 50.2
  29. 40000
  30. 40
  31. 42.2
  32. 1400
  33. 40100
  34. 1700
  35. 1200
  36. 60
  37. 40000
  38. 1300
  39. 14.3
  40. 18000

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