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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 243 · 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 103 + 600 + 300? (a) 1000 (b) 900 (c) 1100 (d) 1200
  2. 2.Which is closest to 197 + 504 + 902? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  3. 3.Round 90473 to the nearest thousand.
  4. 4.Which is closest to 196 × 30? (Round each number first.) (a) 600 (b) 12000 (c) 6000 (d) 60000
  5. 5.Round 42487 to the nearest ten.
  6. 6.Round 76366 to the nearest ten.
  7. 7.Round 68659 to the nearest hundred.
  8. 8.Which is closest to 404 + 98 + 898? (a) 1500 (b) 1600 (c) 1300 (d) 1400
  9. 9.Which is closest to 203 + 595 + 499? (a) 1400 (b) 1500 (c) 1200 (d) 1300
  10. 10.Which is closest to 98 + 300 + 403? (a) 1000 (b) 700 (c) 800 (d) 900
  11. 11.Which is closest to 2399 ÷ 29? (a) 800 (b) 160 (c) 40 (d) 80
  12. 12.Which is closest to 594 ÷ 29? (a) 40 (b) 20 (c) 10 (d) 200
  13. 13.Round 57089 to the nearest thousand.
  14. 14.Round 19.88 to one decimal place. =
  15. 15.Which is closest to 996 ÷ 19? (a) 500 (b) 50 (c) 100 (d) 25
  16. 16.Which is closest to 502 × 28? (Round each number first.) (a) 1500 (b) 150000 (c) 30000 (d) 15000
  17. 17.Round 96.54 to one decimal place. =
  18. 18.Round 38732 to the nearest thousand.
  19. 19.Which is closest to 1806 ÷ 19? (a) 45 (b) 90 (c) 900 (d) 180
  20. 20.Round 36.66 to one decimal place. =
  21. 21.Which is closest to 2696 ÷ 31? (a) 45 (b) 90 (c) 180 (d) 900
  22. 22.Which is closest to 895 + 697 + 102? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  23. 23.Which is closest to 1198 ÷ 19? (a) 30 (b) 600 (c) 60 (d) 120
  24. 24.Round 44786 to the nearest thousand.
  25. 25.Round 21671 to the nearest ten.
  26. 26.Which is closest to 1999 ÷ 49? (a) 400 (b) 40 (c) 80 (d) 20
  27. 27.Which is closest to 695 + 498 + 496? (a) 1900 (b) 1800 (c) 1700 (d) 1600
  28. 28.Round 14.53 to one decimal place. =
  29. 29.Which is closest to 295 + 197 + 295? (a) 900 (b) 1000 (c) 700 (d) 800
  30. 30.Round 84783 to the nearest ten.
  31. 31.Round 28776 to the nearest ten.
  32. 32.Which is closest to 1201 ÷ 39? (a) 300 (b) 60 (c) 15 (d) 30
  33. 33.Round 53.43 to one decimal place. =
  34. 34.Which is closest to 398 × 68? (Round each number first.) (a) 28000 (b) 280000 (c) 2800 (d) 56000
  35. 35.Which is closest to 1497 ÷ 31? (a) 100 (b) 500 (c) 50 (d) 25
  36. 36.Round 64.59 to one decimal place. =
  37. 37.Round 33.47 to one decimal place. =
  38. 38.Which is closest to 502 × 80? (Round each number first.) (a) 40000 (b) 400000 (c) 80000 (d) 4000
  39. 39.Round 48.11 to one decimal place. =
  40. 40.Which is closest to 296 + 395 + 496? (a) 1200 (b) 1100 (c) 1400 (d) 1300

Answer key

  1. 1000
  2. 1600
  3. 90000
  4. 6000
  5. 42490
  6. 76370
  7. 68700
  8. 1400
  9. 1300
  10. 800
  11. 80
  12. 20
  13. 57000
  14. 19.9
  15. 50
  16. 15000
  17. 96.5
  18. 39000
  19. 90
  20. 36.7
  21. 90
  22. 1700
  23. 60
  24. 45000
  25. 21670
  26. 40
  27. 1700
  28. 14.5
  29. 800
  30. 84780
  31. 28780
  32. 30
  33. 53.4
  34. 28000
  35. 50
  36. 64.6
  37. 33.5
  38. 40000
  39. 48.1
  40. 1200

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