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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 756 · 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 402 + 496 + 296? (a) 1300 (b) 1200 (c) 1400 (d) 1100
  2. 2.Which is closest to 896 + 801 + 98? (a) 1800 (b) 1900 (c) 1700 (d) 2000
  3. 3.Which is closest to 704 + 805 + 399? (a) 1900 (b) 2100 (c) 1800 (d) 2000
  4. 4.Round 11261 to the nearest ten.
  5. 5.Round 81343 to the nearest hundred.
  6. 6.Which is closest to 705 + 204 + 797? (a) 1800 (b) 1600 (c) 1700 (d) 1900
  7. 7.Which is closest to 2404 ÷ 29? (a) 800 (b) 40 (c) 80 (d) 160
  8. 8.Round 80.89 to one decimal place. =
  9. 9.Round 61.91 to one decimal place. =
  10. 10.Which is closest to 605 + 203 + 401? (a) 1100 (b) 1300 (c) 1400 (d) 1200
  11. 11.Which is closest to 198 + 801 + 395? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  12. 12.Round 94706 to the nearest thousand.
  13. 13.Which is closest to 1492 ÷ 29? (a) 25 (b) 50 (c) 500 (d) 100
  14. 14.Which is closest to 699 + 396 + 902? (a) 1900 (b) 2000 (c) 2200 (d) 2100
  15. 15.Which is closest to 496 × 41? (Round each number first.) (a) 200000 (b) 2000 (c) 40000 (d) 20000
  16. 16.Round 6794 to the nearest ten.
  17. 17.Which is closest to 396 + 597 + 195? (a) 1100 (b) 1400 (c) 1300 (d) 1200
  18. 18.Which is closest to 599 × 58? (Round each number first.) (a) 3600 (b) 360000 (c) 72000 (d) 36000
  19. 19.Which is closest to 303 + 403 + 502? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  20. 20.Which is closest to 504 + 803 + 196? (a) 1700 (b) 1500 (c) 1400 (d) 1600
  21. 21.Round 38.61 to one decimal place. =
  22. 22.Which is closest to 1202 ÷ 39? (a) 300 (b) 15 (c) 30 (d) 60
  23. 23.Which is closest to 504 × 79? (Round each number first.) (a) 4000 (b) 40000 (c) 80000 (d) 400000
  24. 24.Round 36938 to the nearest thousand.
  25. 25.Round 16.81 to one decimal place. =
  26. 26.Round 97.81 to one decimal place. =
  27. 27.Which is closest to 2494 ÷ 51? (a) 50 (b) 25 (c) 100 (d) 500
  28. 28.Which is closest to 497 + 504 + 296? (a) 1300 (b) 1200 (c) 1500 (d) 1400
  29. 29.Which is closest to 796 + 195 + 401? (a) 1300 (b) 1600 (c) 1400 (d) 1500
  30. 30.Round 38.52 to one decimal place. =
  31. 31.Round 69.92 to one decimal place. =
  32. 32.Which is closest to 798 + 700 + 702? (a) 2300 (b) 2200 (c) 2100 (d) 2400
  33. 33.Which is closest to 305 + 205 + 901? (a) 1600 (b) 1500 (c) 1400 (d) 1300
  34. 34.Round 59.28 to one decimal place. =
  35. 35.Which is closest to 904 × 78? (Round each number first.) (a) 7200 (b) 720000 (c) 144000 (d) 72000
  36. 36.Round 55.92 to one decimal place. =
  37. 37.Which is closest to 400 + 596 + 905? (a) 1800 (b) 2100 (c) 1900 (d) 2000
  38. 38.Which is closest to 301 × 28? (Round each number first.) (a) 18000 (b) 90000 (c) 900 (d) 9000
  39. 39.Round 80.84 to one decimal place. =
  40. 40.Which is closest to 798 × 58? (Round each number first.) (a) 480000 (b) 96000 (c) 4800 (d) 48000

Answer key

  1. 1200
  2. 1800
  3. 1900
  4. 11260
  5. 81300
  6. 1700
  7. 80
  8. 80.9
  9. 61.9
  10. 1200
  11. 1400
  12. 95000
  13. 50
  14. 2000
  15. 20000
  16. 6790
  17. 1200
  18. 36000
  19. 1200
  20. 1500
  21. 38.6
  22. 30
  23. 40000
  24. 37000
  25. 16.8
  26. 97.8
  27. 50
  28. 1300
  29. 1400
  30. 38.5
  31. 69.9
  32. 2200
  33. 1400
  34. 59.3
  35. 72000
  36. 55.9
  37. 1900
  38. 9000
  39. 80.8
  40. 48000

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