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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 465 · 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 97 + 800 + 204? (a) 1100 (b) 1000 (c) 1200 (d) 1300
  2. 2.Round 91.07 to one decimal place. =
  3. 3.Which is closest to 801 × 19? (Round each number first.) (a) 1600 (b) 32000 (c) 16000 (d) 160000
  4. 4.Round 81422 to the nearest hundred.
  5. 5.Round 36475 to the nearest thousand.
  6. 6.Round 56997 to the nearest ten.
  7. 7.Round 13.19 to one decimal place. =
  8. 8.Which is closest to 2808 ÷ 39? (a) 700 (b) 70 (c) 140 (d) 35
  9. 9.Which is closest to 699 × 32? (Round each number first.) (a) 21000 (b) 210000 (c) 42000 (d) 2100
  10. 10.Which is closest to 601 ÷ 21? (a) 60 (b) 30 (c) 300 (d) 15
  11. 11.Round 93.84 to one decimal place. =
  12. 12.Round 72786 to the nearest hundred.
  13. 13.Round 96888 to the nearest hundred.
  14. 14.Which is closest to 993 ÷ 21? (a) 100 (b) 50 (c) 500 (d) 25
  15. 15.Round 88852 to the nearest ten.
  16. 16.Which is closest to 504 × 49? (Round each number first.) (a) 2500 (b) 250000 (c) 50000 (d) 25000
  17. 17.Round 95.56 to one decimal place. =
  18. 18.Which is closest to 807 ÷ 41? (a) 40 (b) 10 (c) 200 (d) 20
  19. 19.Which is closest to 400 + 96 + 398? (a) 1100 (b) 800 (c) 900 (d) 1000
  20. 20.Which is closest to 297 + 800 + 597? (a) 1700 (b) 1800 (c) 1600 (d) 1900
  21. 21.Which is closest to 796 × 18? (Round each number first.) (a) 32000 (b) 1600 (c) 160000 (d) 16000
  22. 22.Which is closest to 403 + 797 + 705? (a) 2000 (b) 1800 (c) 1900 (d) 2100
  23. 23.Round 49.64 to one decimal place. =
  24. 24.Which is closest to 996 ÷ 19? (a) 25 (b) 50 (c) 100 (d) 500
  25. 25.Round 56412 to the nearest hundred.
  26. 26.Which is closest to 696 × 69? (Round each number first.) (a) 490000 (b) 98000 (c) 49000 (d) 4900
  27. 27.Round 22.41 to one decimal place. =
  28. 28.Which is closest to 904 × 70? (Round each number first.) (a) 630000 (b) 6300 (c) 63000 (d) 126000
  29. 29.Round 36116 to the nearest hundred.
  30. 30.Which is closest to 200 + 400 + 901? (a) 1500 (b) 1400 (c) 1700 (d) 1600
  31. 31.Which is closest to 198 × 38? (Round each number first.) (a) 8000 (b) 16000 (c) 80000 (d) 800
  32. 32.Round 33.58 to one decimal place. =
  33. 33.Which is closest to 796 × 68? (Round each number first.) (a) 560000 (b) 112000 (c) 5600 (d) 56000
  34. 34.Which is closest to 597 × 68? (Round each number first.) (a) 42000 (b) 420000 (c) 4200 (d) 84000
  35. 35.Which is closest to 396 × 41? (Round each number first.) (a) 32000 (b) 160000 (c) 16000 (d) 1600
  36. 36.Which is closest to 897 + 399 + 703? (a) 1900 (b) 2000 (c) 2200 (d) 2100
  37. 37.Which is closest to 696 + 900 + 504? (a) 2300 (b) 2200 (c) 2100 (d) 2000
  38. 38.Which is closest to 398 × 60? (Round each number first.) (a) 24000 (b) 240000 (c) 2400 (d) 48000
  39. 39.Which is closest to 1504 ÷ 29? (a) 25 (b) 500 (c) 50 (d) 100
  40. 40.Round 85.21 to one decimal place. =

Answer key

  1. 1100
  2. 91.1
  3. 16000
  4. 81400
  5. 36000
  6. 57000
  7. 13.2
  8. 70
  9. 21000
  10. 30
  11. 93.8
  12. 72800
  13. 96900
  14. 50
  15. 88850
  16. 25000
  17. 95.6
  18. 20
  19. 900
  20. 1700
  21. 16000
  22. 1900
  23. 49.6
  24. 50
  25. 56400
  26. 49000
  27. 22.4
  28. 63000
  29. 36100
  30. 1500
  31. 8000
  32. 33.6
  33. 56000
  34. 42000
  35. 16000
  36. 2000
  37. 2100
  38. 24000
  39. 50
  40. 85.2

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