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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 52 · 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 67.89 to one decimal place. =
  2. 2.Which is closest to 394 ÷ 19? (a) 20 (b) 40 (c) 10 (d) 200
  3. 3.Round 75.66 to one decimal place. =
  4. 4.Which is closest to 808 ÷ 21? (a) 20 (b) 40 (c) 400 (d) 80
  5. 5.Which is closest to 303 + 897 + 196? (a) 1400 (b) 1300 (c) 1500 (d) 1600
  6. 6.Which is closest to 398 + 697 + 895? (a) 1900 (b) 2100 (c) 2000 (d) 2200
  7. 7.Round 74148 to the nearest ten.
  8. 8.Round 6331 to the nearest thousand.
  9. 9.Round 85567 to the nearest hundred.
  10. 10.Round 58.92 to one decimal place. =
  11. 11.Which is closest to 2501 ÷ 49? (a) 100 (b) 25 (c) 50 (d) 500
  12. 12.Which is closest to 591 ÷ 21? (a) 300 (b) 15 (c) 30 (d) 60
  13. 13.Which is closest to 602 × 32? (Round each number first.) (a) 18000 (b) 180000 (c) 1800 (d) 36000
  14. 14.Which is closest to 599 × 68? (Round each number first.) (a) 420000 (b) 4200 (c) 42000 (d) 84000
  15. 15.Which is closest to 801 × 21? (Round each number first.) (a) 32000 (b) 160000 (c) 1600 (d) 16000
  16. 16.Round 43834 to the nearest ten.
  17. 17.Which is closest to 403 × 49? (Round each number first.) (a) 2000 (b) 200000 (c) 40000 (d) 20000
  18. 18.Which is closest to 397 + 604 + 303? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  19. 19.Which is closest to 3602 ÷ 39? (a) 180 (b) 90 (c) 45 (d) 900
  20. 20.Which is closest to 3006 ÷ 49? (a) 30 (b) 120 (c) 60 (d) 600
  21. 21.Which is closest to 500 × 78? (Round each number first.) (a) 400000 (b) 4000 (c) 80000 (d) 40000
  22. 22.Which is closest to 3494 ÷ 49? (a) 70 (b) 140 (c) 35 (d) 700
  23. 23.Which is closest to 604 + 96 + 102? (a) 1000 (b) 800 (c) 900 (d) 700
  24. 24.Which is closest to 605 + 500 + 395? (a) 1400 (b) 1700 (c) 1500 (d) 1600
  25. 25.Round 76.43 to one decimal place. =
  26. 26.Round 55.31 to one decimal place. =
  27. 27.Which is closest to 298 + 401 + 897? (a) 1600 (b) 1700 (c) 1800 (d) 1500
  28. 28.Which is closest to 409 ÷ 19? (a) 20 (b) 200 (c) 40 (d) 10
  29. 29.Which is closest to 598 ÷ 29? (a) 40 (b) 20 (c) 200 (d) 10
  30. 30.Which is closest to 95 + 97 + 398? (a) 500 (b) 700 (c) 600 (d) 800
  31. 31.Round 31.38 to one decimal place. =
  32. 32.Round 61.69 to one decimal place. =
  33. 33.Which is closest to 500 × 28? (Round each number first.) (a) 30000 (b) 15000 (c) 1500 (d) 150000
  34. 34.Which is closest to 105 + 604 + 305? (a) 1200 (b) 1000 (c) 1100 (d) 900
  35. 35.Which is closest to 1808 ÷ 19? (a) 180 (b) 90 (c) 45 (d) 900
  36. 36.Round 24.69 to one decimal place. =
  37. 37.Which is closest to 497 × 18? (Round each number first.) (a) 20000 (b) 1000 (c) 10000 (d) 100000
  38. 38.Which is closest to 800 × 61? (Round each number first.) (a) 480000 (b) 4800 (c) 48000 (d) 96000
  39. 39.Which is closest to 1208 ÷ 21? (a) 120 (b) 60 (c) 30 (d) 600
  40. 40.Which is closest to 1792 ÷ 29? (a) 120 (b) 30 (c) 600 (d) 60

Answer key

  1. 67.9
  2. 20
  3. 75.7
  4. 40
  5. 1400
  6. 2000
  7. 74150
  8. 6000
  9. 85600
  10. 58.9
  11. 50
  12. 30
  13. 18000
  14. 42000
  15. 16000
  16. 43830
  17. 20000
  18. 1300
  19. 90
  20. 60
  21. 40000
  22. 70
  23. 800
  24. 1500
  25. 76.4
  26. 55.3
  27. 1600
  28. 20
  29. 20
  30. 600
  31. 31.4
  32. 61.7
  33. 15000
  34. 1000
  35. 90
  36. 24.7
  37. 10000
  38. 48000
  39. 60
  40. 60

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