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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 377 · 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.Round 40.26 to one decimal place. =
  2. 2.Which is closest to 4496 ÷ 51? (a) 180 (b) 900 (c) 90 (d) 45
  3. 3.Which is closest to 3605 ÷ 41? (a) 45 (b) 180 (c) 90 (d) 900
  4. 4.Round 87987 to the nearest thousand.
  5. 5.Round 35.29 to one decimal place. =
  6. 6.Which is closest to 808 ÷ 21? (a) 80 (b) 20 (c) 400 (d) 40
  7. 7.Which is closest to 1809 ÷ 21? (a) 45 (b) 180 (c) 90 (d) 900
  8. 8.Which is closest to 906 ÷ 31? (a) 60 (b) 15 (c) 30 (d) 300
  9. 9.Round 99895 to the nearest hundred.
  10. 10.Which is closest to 2492 ÷ 51? (a) 25 (b) 50 (c) 500 (d) 100
  11. 11.Round 68.18 to one decimal place. =
  12. 12.Which is closest to 4501 ÷ 49? (a) 45 (b) 90 (c) 180 (d) 900
  13. 13.Which is closest to 696 + 597 + 902? (a) 2300 (b) 2200 (c) 2400 (d) 2100
  14. 14.Which is closest to 405 + 197 + 796? (a) 1400 (b) 1600 (c) 1500 (d) 1300
  15. 15.Round 31.23 to one decimal place. =
  16. 16.Round 43709 to the nearest ten.
  17. 17.Round 41.89 to one decimal place. =
  18. 18.Which is closest to 502 + 205 + 905? (a) 1700 (b) 1800 (c) 1600 (d) 1500
  19. 19.Which is closest to 303 + 898 + 205? (a) 1300 (b) 1500 (c) 1400 (d) 1600
  20. 20.Round 16041 to the nearest hundred.
  21. 21.Which is closest to 697 + 600 + 300? (a) 1500 (b) 1700 (c) 1800 (d) 1600
  22. 22.Which is closest to 2006 ÷ 39? (a) 50 (b) 100 (c) 25 (d) 500
  23. 23.Round 23.49 to one decimal place. =
  24. 24.Which is closest to 198 × 39? (Round each number first.) (a) 16000 (b) 80000 (c) 800 (d) 8000
  25. 25.Which is closest to 604 × 40? (Round each number first.) (a) 48000 (b) 240000 (c) 2400 (d) 24000
  26. 26.Which is closest to 201 × 42? (Round each number first.) (a) 800 (b) 16000 (c) 8000 (d) 80000
  27. 27.Which is closest to 695 + 97 + 796? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  28. 28.Which is closest to 1006 ÷ 21? (a) 500 (b) 100 (c) 25 (d) 50
  29. 29.Which is closest to 96 + 302 + 898? (a) 1400 (b) 1500 (c) 1300 (d) 1200
  30. 30.Round 29414 to the nearest hundred.
  31. 31.Which is closest to 301 × 22? (Round each number first.) (a) 12000 (b) 60000 (c) 6000 (d) 600
  32. 32.Which is closest to 198 + 305 + 600? (a) 1000 (b) 1200 (c) 1300 (d) 1100
  33. 33.Which is closest to 901 × 18? (Round each number first.) (a) 1800 (b) 36000 (c) 18000 (d) 180000
  34. 34.Which is closest to 397 + 697 + 798? (a) 1800 (b) 2100 (c) 2000 (d) 1900
  35. 35.Which is closest to 1995 ÷ 51? (a) 20 (b) 80 (c) 40 (d) 400
  36. 36.Round 54168 to the nearest ten.
  37. 37.Round 30.56 to one decimal place. =
  38. 38.Round 79431 to the nearest hundred.
  39. 39.Which is closest to 903 + 897 + 304? (a) 2100 (b) 2000 (c) 2200 (d) 2300
  40. 40.Round 21391 to the nearest ten.

Answer key

  1. 40.3
  2. 90
  3. 90
  4. 88000
  5. 35.3
  6. 40
  7. 90
  8. 30
  9. 99900
  10. 50
  11. 68.2
  12. 90
  13. 2200
  14. 1400
  15. 31.2
  16. 43710
  17. 41.9
  18. 1600
  19. 1400
  20. 16000
  21. 1600
  22. 50
  23. 23.5
  24. 8000
  25. 24000
  26. 8000
  27. 1600
  28. 50
  29. 1300
  30. 29400
  31. 6000
  32. 1100
  33. 18000
  34. 1900
  35. 40
  36. 54170
  37. 30.6
  38. 79400
  39. 2100
  40. 21390

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