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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 4 · 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 302 × 41? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
  2. 2.Round 43.28 to one decimal place. =
  3. 3.Which is closest to 303 × 80? (Round each number first.) (a) 240000 (b) 2400 (c) 24000 (d) 48000
  4. 4.Which is closest to 4003 ÷ 49? (a) 800 (b) 80 (c) 160 (d) 40
  5. 5.Which is closest to 2697 ÷ 31? (a) 90 (b) 45 (c) 180 (d) 900
  6. 6.Which is closest to 495 + 905 + 305? (a) 1800 (b) 1700 (c) 1600 (d) 1900
  7. 7.Which is closest to 496 × 72? (Round each number first.) (a) 3500 (b) 350000 (c) 35000 (d) 70000
  8. 8.Round 85.57 to one decimal place. =
  9. 9.Which is closest to 602 ÷ 19? (a) 15 (b) 300 (c) 30 (d) 60
  10. 10.Round 38301 to the nearest hundred.
  11. 11.Which is closest to 499 × 20? (Round each number first.) (a) 1000 (b) 10000 (c) 20000 (d) 100000
  12. 12.Which is closest to 897 × 70? (Round each number first.) (a) 126000 (b) 630000 (c) 6300 (d) 63000
  13. 13.Which is closest to 596 + 204 + 897? (a) 1700 (b) 1800 (c) 1900 (d) 1600
  14. 14.Round 48.83 to one decimal place. =
  15. 15.Round 84.61 to one decimal place. =
  16. 16.Round 99.78 to one decimal place. =
  17. 17.Which is closest to 598 × 19? (Round each number first.) (a) 24000 (b) 120000 (c) 12000 (d) 1200
  18. 18.Which is closest to 901 × 21? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  19. 19.Which is closest to 601 ÷ 21? (a) 30 (b) 15 (c) 60 (d) 300
  20. 20.Round 15.07 to one decimal place. =
  21. 21.Which is closest to 703 × 72? (Round each number first.) (a) 4900 (b) 98000 (c) 490000 (d) 49000
  22. 22.Which is closest to 401 + 203 + 698? (a) 1300 (b) 1400 (c) 1500 (d) 1200
  23. 23.Round 28001 to the nearest ten.
  24. 24.Which is closest to 895 + 605 + 503? (a) 2200 (b) 2000 (c) 2100 (d) 1900
  25. 25.Which is closest to 505 + 301 + 798? (a) 1700 (b) 1800 (c) 1600 (d) 1500
  26. 26.Which is closest to 903 × 19? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  27. 27.Round 32.87 to one decimal place. =
  28. 28.Which is closest to 896 + 605 + 299? (a) 1700 (b) 1900 (c) 1800 (d) 2000
  29. 29.Which is closest to 201 × 42? (Round each number first.) (a) 80000 (b) 16000 (c) 8000 (d) 800
  30. 30.Which is closest to 404 × 20? (Round each number first.) (a) 80000 (b) 16000 (c) 8000 (d) 800
  31. 31.Which is closest to 704 × 90? (Round each number first.) (a) 6300 (b) 630000 (c) 63000 (d) 126000
  32. 32.Which is closest to 1001 ÷ 21? (a) 50 (b) 25 (c) 100 (d) 500
  33. 33.Round 76.62 to one decimal place. =
  34. 34.Round 80.29 to one decimal place. =
  35. 35.Round 49.47 to one decimal place. =
  36. 36.Round 48532 to the nearest hundred.
  37. 37.Round 34.37 to one decimal place. =
  38. 38.Which is closest to 3199 ÷ 39? (a) 80 (b) 40 (c) 800 (d) 160
  39. 39.Round 63.72 to one decimal place. =
  40. 40.Which is closest to 701 × 19? (Round each number first.) (a) 140000 (b) 14000 (c) 28000 (d) 1400

Answer key

  1. 12000
  2. 43.3
  3. 24000
  4. 80
  5. 90
  6. 1700
  7. 35000
  8. 85.6
  9. 30
  10. 38300
  11. 10000
  12. 63000
  13. 1700
  14. 48.8
  15. 84.6
  16. 99.8
  17. 12000
  18. 18000
  19. 30
  20. 15.1
  21. 49000
  22. 1300
  23. 28000
  24. 2000
  25. 1600
  26. 18000
  27. 32.9
  28. 1800
  29. 8000
  30. 8000
  31. 63000
  32. 50
  33. 76.6
  34. 80.3
  35. 49.5
  36. 48500
  37. 34.4
  38. 80
  39. 63.7
  40. 14000

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