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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 115 · 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 24.76 to one decimal place. =
  2. 2.Which is closest to 3203 ÷ 39? (a) 800 (b) 40 (c) 160 (d) 80
  3. 3.Round 50695 to the nearest hundred.
  4. 4.Round 54.62 to one decimal place. =
  5. 5.Which is closest to 799 + 100 + 299? (a) 1200 (b) 1400 (c) 1300 (d) 1100
  6. 6.Which is closest to 100 + 401 + 597? (a) 1000 (b) 1300 (c) 1100 (d) 1200
  7. 7.Which is closest to 197 × 21? (Round each number first.) (a) 8000 (b) 4000 (c) 400 (d) 40000
  8. 8.Which is closest to 1204 ÷ 39? (a) 300 (b) 60 (c) 15 (d) 30
  9. 9.Which is closest to 605 + 797 + 801? (a) 2100 (b) 2300 (c) 2200 (d) 2400
  10. 10.Round 49602 to the nearest hundred.
  11. 11.Which is closest to 301 × 59? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  12. 12.Which is closest to 603 + 604 + 604? (a) 1900 (b) 2000 (c) 1800 (d) 1700
  13. 13.Round 27.24 to one decimal place. =
  14. 14.Round 72695 to the nearest hundred.
  15. 15.Which is closest to 900 × 38? (Round each number first.) (a) 36000 (b) 360000 (c) 72000 (d) 3600
  16. 16.Which is closest to 1208 ÷ 19? (a) 600 (b) 120 (c) 60 (d) 30
  17. 17.Which is closest to 1805 ÷ 29? (a) 120 (b) 600 (c) 30 (d) 60
  18. 18.Round 81.47 to one decimal place. =
  19. 19.Which is closest to 1993 ÷ 49? (a) 80 (b) 400 (c) 40 (d) 20
  20. 20.Which is closest to 603 + 395 + 397? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  21. 21.Round 23378 to the nearest thousand.
  22. 22.Round 50.39 to one decimal place. =
  23. 23.Which is closest to 298 + 204 + 598? (a) 1100 (b) 1300 (c) 1000 (d) 1200
  24. 24.Which is closest to 198 × 82? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
  25. 25.Round 37.51 to one decimal place. =
  26. 26.Round 50577 to the nearest thousand.
  27. 27.Which is closest to 597 ÷ 19? (a) 60 (b) 30 (c) 300 (d) 15
  28. 28.Round 58.12 to one decimal place. =
  29. 29.Which is closest to 1800 ÷ 29? (a) 120 (b) 600 (c) 30 (d) 60
  30. 30.Which is closest to 2704 ÷ 29? (a) 45 (b) 180 (c) 90 (d) 900
  31. 31.Round 23.21 to one decimal place. =
  32. 32.Which is closest to 397 × 59? (Round each number first.) (a) 24000 (b) 240000 (c) 48000 (d) 2400
  33. 33.Round 13346 to the nearest thousand.
  34. 34.Which is closest to 499 × 59? (Round each number first.) (a) 30000 (b) 300000 (c) 60000 (d) 3000
  35. 35.Round 69.07 to one decimal place. =
  36. 36.Which is closest to 405 + 404 + 503? (a) 1300 (b) 1200 (c) 1400 (d) 1500
  37. 37.Round 67486 to the nearest ten.
  38. 38.Round 35782 to the nearest thousand.
  39. 39.Which is closest to 198 × 29? (Round each number first.) (a) 60000 (b) 600 (c) 12000 (d) 6000
  40. 40.Which is closest to 304 × 50? (Round each number first.) (a) 150000 (b) 30000 (c) 1500 (d) 15000

Answer key

  1. 24.8
  2. 80
  3. 50700
  4. 54.6
  5. 1200
  6. 1100
  7. 4000
  8. 30
  9. 2200
  10. 49600
  11. 18000
  12. 1800
  13. 27.2
  14. 72700
  15. 36000
  16. 60
  17. 60
  18. 81.5
  19. 40
  20. 1400
  21. 23000
  22. 50.4
  23. 1100
  24. 16000
  25. 37.5
  26. 51000
  27. 30
  28. 58.1
  29. 60
  30. 90
  31. 23.2
  32. 24000
  33. 13000
  34. 30000
  35. 69.1
  36. 1300
  37. 67490
  38. 36000
  39. 6000
  40. 15000

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