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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 860 · 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 395 + 696 + 695? (a) 2000 (b) 1800 (c) 1700 (d) 1900
  2. 2.Which is closest to 500 + 496 + 901? (a) 2000 (b) 1800 (c) 2100 (d) 1900
  3. 3.Which is closest to 902 × 22? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  4. 4.Which is closest to 392 ÷ 19? (a) 40 (b) 200 (c) 20 (d) 10
  5. 5.Which is closest to 804 + 501 + 699? (a) 2200 (b) 2100 (c) 1900 (d) 2000
  6. 6.Which is closest to 296 + 97 + 199? (a) 800 (b) 600 (c) 500 (d) 700
  7. 7.Which is closest to 195 + 797 + 296? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  8. 8.Which is closest to 601 + 98 + 202? (a) 1100 (b) 800 (c) 900 (d) 1000
  9. 9.Which is closest to 204 × 22? (Round each number first.) (a) 40000 (b) 400 (c) 8000 (d) 4000
  10. 10.Round 41.83 to one decimal place. =
  11. 11.Which is closest to 298 × 21? (Round each number first.) (a) 6000 (b) 12000 (c) 600 (d) 60000
  12. 12.Which is closest to 993 ÷ 19? (a) 50 (b) 25 (c) 100 (d) 500
  13. 13.Which is closest to 2007 ÷ 49? (a) 20 (b) 400 (c) 40 (d) 80
  14. 14.Round 33247 to the nearest ten.
  15. 15.Which is closest to 901 × 68? (Round each number first.) (a) 126000 (b) 63000 (c) 630000 (d) 6300
  16. 16.Round 28.89 to one decimal place. =
  17. 17.Which is closest to 597 + 101 + 299? (a) 1000 (b) 900 (c) 1200 (d) 1100
  18. 18.Which is closest to 2395 ÷ 29? (a) 160 (b) 40 (c) 800 (d) 80
  19. 19.Round 43.29 to one decimal place. =
  20. 20.Round 79.57 to one decimal place. =
  21. 21.Which is closest to 3209 ÷ 41? (a) 800 (b) 160 (c) 40 (d) 80
  22. 22.Which is closest to 903 × 60? (Round each number first.) (a) 540000 (b) 5400 (c) 108000 (d) 54000
  23. 23.Round 66.07 to one decimal place. =
  24. 24.Round 57984 to the nearest hundred.
  25. 25.Which is closest to 2491 ÷ 51? (a) 500 (b) 100 (c) 50 (d) 25
  26. 26.Which is closest to 204 + 900 + 404? (a) 1400 (b) 1600 (c) 1700 (d) 1500
  27. 27.Which is closest to 501 × 68? (Round each number first.) (a) 35000 (b) 3500 (c) 70000 (d) 350000
  28. 28.Round 42858 to the nearest thousand.
  29. 29.Which is closest to 4498 ÷ 51? (a) 45 (b) 90 (c) 180 (d) 900
  30. 30.Round 54.17 to one decimal place. =
  31. 31.Which is closest to 608 ÷ 31? (a) 20 (b) 40 (c) 200 (d) 10
  32. 32.Which is closest to 604 ÷ 19? (a) 60 (b) 15 (c) 300 (d) 30
  33. 33.Round 42.58 to one decimal place. =
  34. 34.Round 67.41 to one decimal place. =
  35. 35.Round 78.16 to one decimal place. =
  36. 36.Which is closest to 2105 ÷ 29? (a) 35 (b) 700 (c) 140 (d) 70
  37. 37.Which is closest to 994 ÷ 21? (a) 25 (b) 50 (c) 500 (d) 100
  38. 38.Which is closest to 398 × 62? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  39. 39.Which is closest to 992 ÷ 49? (a) 20 (b) 10 (c) 40 (d) 200
  40. 40.Which is closest to 397 + 195 + 495? (a) 1300 (b) 1100 (c) 1000 (d) 1200

Answer key

  1. 1800
  2. 1900
  3. 18000
  4. 20
  5. 2000
  6. 600
  7. 1300
  8. 900
  9. 4000
  10. 41.8
  11. 6000
  12. 50
  13. 40
  14. 33250
  15. 63000
  16. 28.9
  17. 1000
  18. 80
  19. 43.3
  20. 79.6
  21. 80
  22. 54000
  23. 66.1
  24. 58000
  25. 50
  26. 1500
  27. 35000
  28. 43000
  29. 90
  30. 54.2
  31. 20
  32. 30
  33. 42.6
  34. 67.4
  35. 78.2
  36. 70
  37. 50
  38. 24000
  39. 20
  40. 1100

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