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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 30 · 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 72.93 to one decimal place. =
  2. 2.Round 77305 to the nearest thousand.
  3. 3.Which is closest to 100 + 700 + 801? (a) 1600 (b) 1700 (c) 1800 (d) 1500
  4. 4.Round 28.16 to one decimal place. =
  5. 5.Which is closest to 197 × 49? (Round each number first.) (a) 20000 (b) 100000 (c) 10000 (d) 1000
  6. 6.Round 27.73 to one decimal place. =
  7. 7.Which is closest to 202 + 801 + 98? (a) 1000 (b) 1100 (c) 1200 (d) 1300
  8. 8.Round 82.06 to one decimal place. =
  9. 9.Which is closest to 96 + 796 + 303? (a) 1400 (b) 1100 (c) 1300 (d) 1200
  10. 10.Which is closest to 895 + 303 + 705? (a) 2000 (b) 2100 (c) 1900 (d) 1800
  11. 11.Round 51.57 to one decimal place. =
  12. 12.Which is closest to 399 × 40? (Round each number first.) (a) 32000 (b) 160000 (c) 1600 (d) 16000
  13. 13.Which is closest to 303 + 604 + 96? (a) 900 (b) 1100 (c) 1200 (d) 1000
  14. 14.Which is closest to 296 + 501 + 296? (a) 1000 (b) 1200 (c) 1100 (d) 1300
  15. 15.Which is closest to 2499 ÷ 51? (a) 100 (b) 25 (c) 500 (d) 50
  16. 16.Which is closest to 497 × 51? (Round each number first.) (a) 50000 (b) 2500 (c) 250000 (d) 25000
  17. 17.Round 57099 to the nearest thousand.
  18. 18.Which is closest to 602 + 500 + 698? (a) 1900 (b) 2000 (c) 1800 (d) 1700
  19. 19.Which is closest to 96 + 795 + 601? (a) 1400 (b) 1700 (c) 1600 (d) 1500
  20. 20.Round 39.52 to one decimal place. =
  21. 21.Which is closest to 399 × 28? (Round each number first.) (a) 24000 (b) 120000 (c) 12000 (d) 1200
  22. 22.Round 41913 to the nearest ten.
  23. 23.Which is closest to 95 + 600 + 901? (a) 1600 (b) 1800 (c) 1500 (d) 1700
  24. 24.Round 84.54 to one decimal place. =
  25. 25.Round 88.73 to one decimal place. =
  26. 26.Which is closest to 702 × 39? (Round each number first.) (a) 28000 (b) 2800 (c) 56000 (d) 280000
  27. 27.Which is closest to 801 + 295 + 797? (a) 1800 (b) 2000 (c) 1900 (d) 2100
  28. 28.Which is closest to 101 + 398 + 95? (a) 500 (b) 700 (c) 600 (d) 800
  29. 29.Which is closest to 799 + 595 + 601? (a) 1900 (b) 2000 (c) 2100 (d) 2200
  30. 30.Which is closest to 904 + 97 + 803? (a) 1900 (b) 1700 (c) 1800 (d) 2000
  31. 31.Which is closest to 405 + 203 + 101? (a) 800 (b) 900 (c) 600 (d) 700
  32. 32.Round 95610 to the nearest thousand.
  33. 33.Round 25197 to the nearest hundred.
  34. 34.Which is closest to 502 + 395 + 495? (a) 1400 (b) 1300 (c) 1600 (d) 1500
  35. 35.Which is closest to 2494 ÷ 49? (a) 25 (b) 100 (c) 500 (d) 50
  36. 36.Round 49587 to the nearest hundred.
  37. 37.Round 66.22 to one decimal place. =
  38. 38.Which is closest to 1609 ÷ 19? (a) 160 (b) 80 (c) 40 (d) 800
  39. 39.Round 51764 to the nearest hundred.
  40. 40.Which is closest to 496 × 88? (Round each number first.) (a) 450000 (b) 4500 (c) 45000 (d) 90000

Answer key

  1. 72.9
  2. 77000
  3. 1600
  4. 28.2
  5. 10000
  6. 27.7
  7. 1100
  8. 82.1
  9. 1200
  10. 1900
  11. 51.6
  12. 16000
  13. 1000
  14. 1100
  15. 50
  16. 25000
  17. 57000
  18. 1800
  19. 1500
  20. 39.5
  21. 12000
  22. 41910
  23. 1600
  24. 84.5
  25. 88.7
  26. 28000
  27. 1900
  28. 600
  29. 2000
  30. 1800
  31. 700
  32. 96000
  33. 25200
  34. 1400
  35. 50
  36. 49600
  37. 66.2
  38. 80
  39. 51800
  40. 45000

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