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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 303 · 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 1596 ÷ 19? (a) 40 (b) 160 (c) 800 (d) 80
  2. 2.Round 10575 to the nearest thousand.
  3. 3.Which is closest to 1805 ÷ 21? (a) 45 (b) 180 (c) 90 (d) 900
  4. 4.Which is closest to 401 + 99 + 197? (a) 800 (b) 600 (c) 700 (d) 900
  5. 5.Which is closest to 605 ÷ 31? (a) 10 (b) 200 (c) 40 (d) 20
  6. 6.Round 59341 to the nearest thousand.
  7. 7.Round 22169 to the nearest ten.
  8. 8.Which is closest to 796 + 302 + 604? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  9. 9.Which is closest to 1199 ÷ 31? (a) 400 (b) 80 (c) 20 (d) 40
  10. 10.Which is closest to 499 × 42? (Round each number first.) (a) 40000 (b) 200000 (c) 2000 (d) 20000
  11. 11.Round 65.82 to one decimal place. =
  12. 12.Which is closest to 602 × 49? (Round each number first.) (a) 60000 (b) 30000 (c) 300000 (d) 3000
  13. 13.Which is closest to 698 × 62? (Round each number first.) (a) 4200 (b) 84000 (c) 420000 (d) 42000
  14. 14.Round 97.17 to one decimal place. =
  15. 15.Which is closest to 704 × 31? (Round each number first.) (a) 210000 (b) 2100 (c) 21000 (d) 42000
  16. 16.Which is closest to 899 + 396 + 197? (a) 1600 (b) 1700 (c) 1400 (d) 1500
  17. 17.Which is closest to 602 + 504 + 195? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  18. 18.Round 26.83 to one decimal place. =
  19. 19.Which is closest to 404 × 91? (Round each number first.) (a) 360000 (b) 72000 (c) 36000 (d) 3600
  20. 20.Round 32.41 to one decimal place. =
  21. 21.Which is closest to 1994 ÷ 51? (a) 80 (b) 20 (c) 400 (d) 40
  22. 22.Which is closest to 1193 ÷ 21? (a) 120 (b) 60 (c) 600 (d) 30
  23. 23.Round 48968 to the nearest thousand.
  24. 24.Which is closest to 901 + 200 + 199? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  25. 25.Which is closest to 598 + 100 + 395? (a) 1200 (b) 1000 (c) 1300 (d) 1100
  26. 26.Round 8063 to the nearest thousand.
  27. 27.Which is closest to 799 × 49? (Round each number first.) (a) 4000 (b) 40000 (c) 80000 (d) 400000
  28. 28.Which is closest to 403 × 19? (Round each number first.) (a) 16000 (b) 8000 (c) 80000 (d) 800
  29. 29.Round 61.57 to one decimal place. =
  30. 30.Round 84.29 to one decimal place. =
  31. 31.Which is closest to 99 + 196 + 100? (a) 300 (b) 500 (c) 600 (d) 400
  32. 32.Which is closest to 1193 ÷ 31? (a) 80 (b) 40 (c) 400 (d) 20
  33. 33.Which is closest to 698 × 89? (Round each number first.) (a) 63000 (b) 6300 (c) 126000 (d) 630000
  34. 34.Which is closest to 701 × 18? (Round each number first.) (a) 140000 (b) 14000 (c) 1400 (d) 28000
  35. 35.Which is closest to 2006 ÷ 39? (a) 100 (b) 50 (c) 500 (d) 25
  36. 36.Round 61425 to the nearest hundred.
  37. 37.Which is closest to 204 × 58? (Round each number first.) (a) 1200 (b) 12000 (c) 120000 (d) 24000
  38. 38.Round 31.08 to one decimal place. =
  39. 39.Which is closest to 1407 ÷ 21? (a) 700 (b) 140 (c) 35 (d) 70
  40. 40.Round 81151 to the nearest ten.

Answer key

  1. 80
  2. 11000
  3. 90
  4. 700
  5. 20
  6. 59000
  7. 22170
  8. 1700
  9. 40
  10. 20000
  11. 65.8
  12. 30000
  13. 42000
  14. 97.2
  15. 21000
  16. 1500
  17. 1300
  18. 26.8
  19. 36000
  20. 32.4
  21. 40
  22. 60
  23. 49000
  24. 1300
  25. 1100
  26. 8000
  27. 40000
  28. 8000
  29. 61.6
  30. 84.3
  31. 400
  32. 40
  33. 63000
  34. 14000
  35. 50
  36. 61400
  37. 12000
  38. 31.1
  39. 70
  40. 81150

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