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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 286 · 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 2006 ÷ 39? (a) 500 (b) 50 (c) 25 (d) 100
  2. 2.Which is closest to 596 × 79? (Round each number first.) (a) 96000 (b) 4800 (c) 480000 (d) 48000
  3. 3.Round 98.37 to one decimal place. =
  4. 4.Which is closest to 696 × 59? (Round each number first.) (a) 84000 (b) 42000 (c) 420000 (d) 4200
  5. 5.Round 56.32 to one decimal place. =
  6. 6.Round 16.64 to one decimal place. =
  7. 7.Round 70.18 to one decimal place. =
  8. 8.Which is closest to 799 × 29? (Round each number first.) (a) 24000 (b) 2400 (c) 240000 (d) 48000
  9. 9.Which is closest to 804 × 29? (Round each number first.) (a) 2400 (b) 48000 (c) 24000 (d) 240000
  10. 10.Which is closest to 3997 ÷ 49? (a) 800 (b) 160 (c) 40 (d) 80
  11. 11.Which is closest to 897 × 60? (Round each number first.) (a) 54000 (b) 540000 (c) 108000 (d) 5400
  12. 12.Round 19.28 to one decimal place. =
  13. 13.Which is closest to 205 + 499 + 603? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  14. 14.Which is closest to 798 + 99 + 101? (a) 1200 (b) 1000 (c) 900 (d) 1100
  15. 15.Round 75803 to the nearest hundred.
  16. 16.Which is closest to 2993 ÷ 51? (a) 120 (b) 30 (c) 60 (d) 600
  17. 17.Which is closest to 797 × 80? (Round each number first.) (a) 128000 (b) 64000 (c) 640000 (d) 6400
  18. 18.Which is closest to 505 + 603 + 405? (a) 1600 (b) 1700 (c) 1400 (d) 1500
  19. 19.Which is closest to 597 + 303 + 602? (a) 1400 (b) 1700 (c) 1600 (d) 1500
  20. 20.Which is closest to 698 × 78? (Round each number first.) (a) 560000 (b) 5600 (c) 56000 (d) 112000
  21. 21.Round 21321 to the nearest ten.
  22. 22.Round 76561 to the nearest thousand.
  23. 23.Round 82120 to the nearest thousand.
  24. 24.Round 62635 to the nearest thousand.
  25. 25.Round 26.48 to one decimal place. =
  26. 26.Round 30063 to the nearest hundred.
  27. 27.Which is closest to 995 ÷ 51? (a) 40 (b) 200 (c) 10 (d) 20
  28. 28.Round 59.92 to one decimal place. =
  29. 29.Which is closest to 399 + 503 + 797? (a) 1700 (b) 1800 (c) 1600 (d) 1900
  30. 30.Round 43422 to the nearest hundred.
  31. 31.Which is closest to 498 + 600 + 798? (a) 1800 (b) 1900 (c) 2000 (d) 2100
  32. 32.Round 14.33 to one decimal place. =
  33. 33.Round 58.48 to one decimal place. =
  34. 34.Round 53.17 to one decimal place. =
  35. 35.Round 36.56 to one decimal place. =
  36. 36.Round 20831 to the nearest hundred.
  37. 37.Which is closest to 405 + 295 + 899? (a) 1700 (b) 1600 (c) 1800 (d) 1500
  38. 38.Which is closest to 999 ÷ 49? (a) 10 (b) 40 (c) 200 (d) 20
  39. 39.Round 11368 to the nearest hundred.
  40. 40.Which is closest to 402 × 89? (Round each number first.) (a) 36000 (b) 72000 (c) 3600 (d) 360000

Answer key

  1. 50
  2. 48000
  3. 98.4
  4. 42000
  5. 56.3
  6. 16.6
  7. 70.2
  8. 24000
  9. 24000
  10. 80
  11. 54000
  12. 19.3
  13. 1300
  14. 1000
  15. 75800
  16. 60
  17. 64000
  18. 1500
  19. 1500
  20. 56000
  21. 21320
  22. 77000
  23. 82000
  24. 63000
  25. 26.5
  26. 30100
  27. 20
  28. 59.9
  29. 1700
  30. 43400
  31. 1900
  32. 14.3
  33. 58.5
  34. 53.2
  35. 36.6
  36. 20800
  37. 1600
  38. 20
  39. 11400
  40. 36000

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