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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 842 · 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 47.23 to one decimal place. =
  2. 2.Which is closest to 97 + 695 + 199? (a) 1000 (b) 1100 (c) 1200 (d) 900
  3. 3.Round 44677 to the nearest ten.
  4. 4.Which is closest to 799 ÷ 41? (a) 200 (b) 40 (c) 20 (d) 10
  5. 5.Round 14855 to the nearest thousand.
  6. 6.Round 68.49 to one decimal place. =
  7. 7.Round 57401 to the nearest ten.
  8. 8.Which is closest to 705 + 897 + 295? (a) 1800 (b) 1900 (c) 2100 (d) 2000
  9. 9.Round 8424 to the nearest hundred.
  10. 10.Which is closest to 893 ÷ 31? (a) 60 (b) 300 (c) 30 (d) 15
  11. 11.Round 31.76 to one decimal place. =
  12. 12.Round 12.82 to one decimal place. =
  13. 13.Round 56479 to the nearest hundred.
  14. 14.Round 52.47 to one decimal place. =
  15. 15.Which is closest to 897 + 495 + 401? (a) 1900 (b) 1700 (c) 1800 (d) 2000
  16. 16.Round 98365 to the nearest thousand.
  17. 17.Which is closest to 1603 ÷ 39? (a) 400 (b) 20 (c) 40 (d) 80
  18. 18.Which is closest to 601 × 29? (Round each number first.) (a) 180000 (b) 1800 (c) 18000 (d) 36000
  19. 19.Which is closest to 201 × 39? (Round each number first.) (a) 80000 (b) 16000 (c) 800 (d) 8000
  20. 20.Which is closest to 98 + 605 + 295? (a) 1100 (b) 1200 (c) 900 (d) 1000
  21. 21.Which is closest to 400 + 202 + 501? (a) 1000 (b) 1300 (c) 1100 (d) 1200
  22. 22.Which is closest to 800 × 51? (Round each number first.) (a) 4000 (b) 40000 (c) 400000 (d) 80000
  23. 23.Round 41.71 to one decimal place. =
  24. 24.Round 44.43 to one decimal place. =
  25. 25.Which is closest to 2009 ÷ 51? (a) 400 (b) 20 (c) 80 (d) 40
  26. 26.Round 12.58 to one decimal place. =
  27. 27.Which is closest to 904 × 60? (Round each number first.) (a) 540000 (b) 54000 (c) 5400 (d) 108000
  28. 28.Which is closest to 809 ÷ 19? (a) 400 (b) 20 (c) 40 (d) 80
  29. 29.Round 40.68 to one decimal place. =
  30. 30.Which is closest to 3004 ÷ 49? (a) 120 (b) 60 (c) 600 (d) 30
  31. 31.Round 38227 to the nearest ten.
  32. 32.Which is closest to 695 + 696 + 96? (a) 1600 (b) 1500 (c) 1400 (d) 1700
  33. 33.Round 94232 to the nearest ten.
  34. 34.Round 45.38 to one decimal place. =
  35. 35.Which is closest to 400 × 81? (Round each number first.) (a) 3200 (b) 320000 (c) 32000 (d) 64000
  36. 36.Which is closest to 700 + 895 + 298? (a) 1900 (b) 1800 (c) 2000 (d) 2100
  37. 37.Which is closest to 204 + 297 + 200? (a) 700 (b) 800 (c) 900 (d) 600
  38. 38.Round 49.77 to one decimal place. =
  39. 39.Round 30934 to the nearest ten.
  40. 40.Which is closest to 1204 ÷ 41? (a) 60 (b) 15 (c) 300 (d) 30

Answer key

  1. 47.2
  2. 1000
  3. 44680
  4. 20
  5. 15000
  6. 68.5
  7. 57400
  8. 1900
  9. 8400
  10. 30
  11. 31.8
  12. 12.8
  13. 56500
  14. 52.5
  15. 1800
  16. 98000
  17. 40
  18. 18000
  19. 8000
  20. 1000
  21. 1100
  22. 40000
  23. 41.7
  24. 44.4
  25. 40
  26. 12.6
  27. 54000
  28. 40
  29. 40.7
  30. 60
  31. 38230
  32. 1500
  33. 94230
  34. 45.4
  35. 32000
  36. 1900
  37. 700
  38. 49.8
  39. 30930
  40. 30

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