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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 985 · 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 1794 ÷ 19? (a) 45 (b) 180 (c) 90 (d) 900
  2. 2.Which is closest to 1200 ÷ 19? (a) 120 (b) 60 (c) 30 (d) 600
  3. 3.Round 36238 to the nearest ten.
  4. 4.Which is closest to 202 + 102 + 905? (a) 1300 (b) 1200 (c) 1400 (d) 1100
  5. 5.Which is closest to 898 + 595 + 697? (a) 2300 (b) 2100 (c) 2200 (d) 2400
  6. 6.Which is closest to 897 × 39? (Round each number first.) (a) 72000 (b) 36000 (c) 3600 (d) 360000
  7. 7.Which is closest to 396 × 62? (Round each number first.) (a) 2400 (b) 24000 (c) 48000 (d) 240000
  8. 8.Round 90.08 to one decimal place. =
  9. 9.Round 41141 to the nearest hundred.
  10. 10.Which is closest to 202 × 30? (Round each number first.) (a) 12000 (b) 6000 (c) 600 (d) 60000
  11. 11.Round 84.38 to one decimal place. =
  12. 12.Which is closest to 903 × 29? (Round each number first.) (a) 27000 (b) 270000 (c) 54000 (d) 2700
  13. 13.Which is closest to 3509 ÷ 49? (a) 140 (b) 70 (c) 700 (d) 35
  14. 14.Which is closest to 2091 ÷ 31? (a) 140 (b) 35 (c) 70 (d) 700
  15. 15.Round 45.87 to one decimal place. =
  16. 16.Which is closest to 700 × 68? (Round each number first.) (a) 490000 (b) 98000 (c) 49000 (d) 4900
  17. 17.Which is closest to 204 × 59? (Round each number first.) (a) 24000 (b) 120000 (c) 1200 (d) 12000
  18. 18.Which is closest to 598 ÷ 31? (a) 40 (b) 10 (c) 200 (d) 20
  19. 19.Which is closest to 3994 ÷ 49? (a) 160 (b) 40 (c) 800 (d) 80
  20. 20.Which is closest to 197 × 58? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  21. 21.Which is closest to 899 + 404 + 903? (a) 2100 (b) 2300 (c) 2400 (d) 2200
  22. 22.Which is closest to 599 ÷ 21? (a) 60 (b) 300 (c) 30 (d) 15
  23. 23.Which is closest to 905 + 296 + 704? (a) 1900 (b) 1800 (c) 2000 (d) 2100
  24. 24.Round 3587 to the nearest thousand.
  25. 25.Round 48.59 to one decimal place. =
  26. 26.Round 38.87 to one decimal place. =
  27. 27.Which is closest to 595 + 502 + 295? (a) 1300 (b) 1600 (c) 1400 (d) 1500
  28. 28.Which is closest to 200 + 601 + 102? (a) 1000 (b) 900 (c) 1100 (d) 800
  29. 29.Which is closest to 2106 ÷ 29? (a) 140 (b) 35 (c) 700 (d) 70
  30. 30.Which is closest to 604 × 58? (Round each number first.) (a) 360000 (b) 72000 (c) 36000 (d) 3600
  31. 31.Round 11296 to the nearest ten.
  32. 32.Round 62.76 to one decimal place. =
  33. 33.Which is closest to 602 + 403 + 704? (a) 1700 (b) 1600 (c) 1900 (d) 1800
  34. 34.Round 91.58 to one decimal place. =
  35. 35.Round 15.94 to one decimal place. =
  36. 36.Which is closest to 409 ÷ 19? (a) 10 (b) 40 (c) 20 (d) 200
  37. 37.Round 31.31 to one decimal place. =
  38. 38.Which is closest to 303 × 61? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  39. 39.Which is closest to 200 × 78? (Round each number first.) (a) 160000 (b) 16000 (c) 32000 (d) 1600
  40. 40.Which is closest to 901 × 90? (Round each number first.) (a) 8100 (b) 162000 (c) 81000 (d) 810000

Answer key

  1. 90
  2. 60
  3. 36240
  4. 1200
  5. 2200
  6. 36000
  7. 24000
  8. 90.1
  9. 41100
  10. 6000
  11. 84.4
  12. 27000
  13. 70
  14. 70
  15. 45.9
  16. 49000
  17. 12000
  18. 20
  19. 80
  20. 12000
  21. 2200
  22. 30
  23. 1900
  24. 4000
  25. 48.6
  26. 38.9
  27. 1400
  28. 900
  29. 70
  30. 36000
  31. 11300
  32. 62.8
  33. 1700
  34. 91.6
  35. 15.9
  36. 20
  37. 31.3
  38. 18000
  39. 16000
  40. 81000

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