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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 318 · 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 796 × 72? (Round each number first.) (a) 56000 (b) 560000 (c) 112000 (d) 5600
  2. 2.Round 60683 to the nearest hundred.
  3. 3.Which is closest to 303 × 22? (Round each number first.) (a) 60000 (b) 600 (c) 6000 (d) 12000
  4. 4.Round 49642 to the nearest hundred.
  5. 5.Which is closest to 203 + 99 + 604? (a) 900 (b) 800 (c) 1100 (d) 1000
  6. 6.Round 13133 to the nearest ten.
  7. 7.Round 34.47 to one decimal place. =
  8. 8.Round 55.71 to one decimal place. =
  9. 9.Which is closest to 600 × 82? (Round each number first.) (a) 480000 (b) 96000 (c) 48000 (d) 4800
  10. 10.Which is closest to 802 + 400 + 601? (a) 1700 (b) 1800 (c) 2000 (d) 1900
  11. 11.Round 63.51 to one decimal place. =
  12. 12.Round 45081 to the nearest hundred.
  13. 13.Which is closest to 4001 ÷ 51? (a) 40 (b) 80 (c) 160 (d) 800
  14. 14.Which is closest to 795 + 897 + 703? (a) 2400 (b) 2600 (c) 2300 (d) 2500
  15. 15.Which is closest to 791 ÷ 21? (a) 400 (b) 40 (c) 80 (d) 20
  16. 16.Which is closest to 698 × 42? (Round each number first.) (a) 2800 (b) 280000 (c) 28000 (d) 56000
  17. 17.Which is closest to 2996 ÷ 51? (a) 120 (b) 600 (c) 30 (d) 60
  18. 18.Round 24.59 to one decimal place. =
  19. 19.Which is closest to 1593 ÷ 19? (a) 80 (b) 40 (c) 800 (d) 160
  20. 20.Which is closest to 803 + 205 + 301? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  21. 21.Which is closest to 2504 ÷ 49? (a) 25 (b) 50 (c) 500 (d) 100
  22. 22.Which is closest to 1203 ÷ 31? (a) 20 (b) 400 (c) 80 (d) 40
  23. 23.Which is closest to 994 ÷ 21? (a) 25 (b) 500 (c) 50 (d) 100
  24. 24.Which is closest to 697 × 82? (Round each number first.) (a) 112000 (b) 5600 (c) 56000 (d) 560000
  25. 25.Which is closest to 604 + 704 + 405? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  26. 26.Which is closest to 197 × 39? (Round each number first.) (a) 16000 (b) 800 (c) 80000 (d) 8000
  27. 27.Round 81.17 to one decimal place. =
  28. 28.Round 98645 to the nearest thousand.
  29. 29.Round 60384 to the nearest thousand.
  30. 30.Round 4382 to the nearest ten.
  31. 31.Round 21742 to the nearest ten.
  32. 32.Round 78.29 to one decimal place. =
  33. 33.Round 31836 to the nearest hundred.
  34. 34.Round 46.18 to one decimal place. =
  35. 35.Which is closest to 605 + 601 + 201? (a) 1500 (b) 1400 (c) 1300 (d) 1600
  36. 36.Round 45039 to the nearest thousand.
  37. 37.Which is closest to 901 + 205 + 201? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  38. 38.Round 75139 to the nearest thousand.
  39. 39.Which is closest to 702 × 70? (Round each number first.) (a) 490000 (b) 4900 (c) 49000 (d) 98000
  40. 40.Round 12.32 to one decimal place. =

Answer key

  1. 56000
  2. 60700
  3. 6000
  4. 49600
  5. 900
  6. 13130
  7. 34.5
  8. 55.7
  9. 48000
  10. 1800
  11. 63.5
  12. 45100
  13. 80
  14. 2400
  15. 40
  16. 28000
  17. 60
  18. 24.6
  19. 80
  20. 1300
  21. 50
  22. 40
  23. 50
  24. 56000
  25. 1700
  26. 8000
  27. 81.2
  28. 99000
  29. 60000
  30. 4380
  31. 21740
  32. 78.3
  33. 31800
  34. 46.2
  35. 1400
  36. 45000
  37. 1300
  38. 75000
  39. 49000
  40. 12.3

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