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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 560 · 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 809 ÷ 21? (a) 80 (b) 20 (c) 400 (d) 40
  2. 2.Round 31688 to the nearest hundred.
  3. 3.Which is closest to 2101 ÷ 31? (a) 700 (b) 140 (c) 35 (d) 70
  4. 4.Round 35.07 to one decimal place. =
  5. 5.Round 77.59 to one decimal place. =
  6. 6.Round 47.71 to one decimal place. =
  7. 7.Which is closest to 2805 ÷ 41? (a) 70 (b) 140 (c) 35 (d) 700
  8. 8.Which is closest to 795 ÷ 41? (a) 10 (b) 40 (c) 20 (d) 200
  9. 9.Which is closest to 699 × 50? (Round each number first.) (a) 350000 (b) 70000 (c) 3500 (d) 35000
  10. 10.Which is closest to 501 + 97 + 104? (a) 900 (b) 700 (c) 600 (d) 800
  11. 11.Round 38838 to the nearest thousand.
  12. 12.Which is closest to 1403 ÷ 19? (a) 700 (b) 35 (c) 70 (d) 140
  13. 13.Round 46769 to the nearest ten.
  14. 14.Which is closest to 600 + 105 + 102? (a) 900 (b) 1000 (c) 700 (d) 800
  15. 15.Which is closest to 704 + 904 + 398? (a) 2100 (b) 1900 (c) 2000 (d) 2200
  16. 16.Which is closest to 3995 ÷ 49? (a) 80 (b) 40 (c) 800 (d) 160
  17. 17.Which is closest to 305 + 497 + 105? (a) 1000 (b) 900 (c) 800 (d) 1100
  18. 18.Round 54948 to the nearest hundred.
  19. 19.Which is closest to 803 × 90? (Round each number first.) (a) 72000 (b) 7200 (c) 144000 (d) 720000
  20. 20.Which is closest to 601 + 105 + 405? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  21. 21.Which is closest to 1794 ÷ 31? (a) 120 (b) 600 (c) 30 (d) 60
  22. 22.Round 68.27 to one decimal place. =
  23. 23.Which is closest to 901 × 38? (Round each number first.) (a) 36000 (b) 360000 (c) 72000 (d) 3600
  24. 24.Which is closest to 303 × 38? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  25. 25.Which is closest to 1800 ÷ 19? (a) 180 (b) 90 (c) 45 (d) 900
  26. 26.Which is closest to 499 + 801 + 402? (a) 1800 (b) 1700 (c) 1600 (d) 1900
  27. 27.Which is closest to 902 × 60? (Round each number first.) (a) 540000 (b) 108000 (c) 5400 (d) 54000
  28. 28.Which is closest to 200 + 795 + 196? (a) 1100 (b) 1200 (c) 1400 (d) 1300
  29. 29.Round 56481 to the nearest thousand.
  30. 30.Which is closest to 195 + 204 + 698? (a) 1300 (b) 1000 (c) 1200 (d) 1100
  31. 31.Which is closest to 96 + 703 + 295? (a) 1100 (b) 1200 (c) 1000 (d) 1300
  32. 32.Which is closest to 904 × 78? (Round each number first.) (a) 72000 (b) 7200 (c) 720000 (d) 144000
  33. 33.Which is closest to 799 + 896 + 400? (a) 2100 (b) 2000 (c) 2200 (d) 2300
  34. 34.Which is closest to 597 × 39? (Round each number first.) (a) 2400 (b) 240000 (c) 24000 (d) 48000
  35. 35.Which is closest to 196 × 81? (Round each number first.) (a) 32000 (b) 160000 (c) 16000 (d) 1600
  36. 36.Which is closest to 696 × 28? (Round each number first.) (a) 21000 (b) 210000 (c) 2100 (d) 42000
  37. 37.Round 15.81 to one decimal place. =
  38. 38.Round 2477 to the nearest hundred.
  39. 39.Which is closest to 905 ÷ 29? (a) 60 (b) 300 (c) 30 (d) 15
  40. 40.Which is closest to 595 + 605 + 901? (a) 2100 (b) 2200 (c) 2000 (d) 2300

Answer key

  1. 40
  2. 31700
  3. 70
  4. 35.1
  5. 77.6
  6. 47.7
  7. 70
  8. 20
  9. 35000
  10. 700
  11. 39000
  12. 70
  13. 46770
  14. 800
  15. 2000
  16. 80
  17. 900
  18. 54900
  19. 72000
  20. 1100
  21. 60
  22. 68.3
  23. 36000
  24. 12000
  25. 90
  26. 1700
  27. 54000
  28. 1200
  29. 56000
  30. 1100
  31. 1100
  32. 72000
  33. 2100
  34. 24000
  35. 16000
  36. 21000
  37. 15.8
  38. 2500
  39. 30
  40. 2100

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