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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 755 · 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 68146 to the nearest thousand.
  2. 2.Which is closest to 1007 ÷ 49? (a) 200 (b) 20 (c) 10 (d) 40
  3. 3.Which is closest to 3603 ÷ 41? (a) 45 (b) 90 (c) 900 (d) 180
  4. 4.Which is closest to 701 + 603 + 705? (a) 2100 (b) 2000 (c) 1900 (d) 2200
  5. 5.Round 40467 to the nearest ten.
  6. 6.Round 59.33 to one decimal place. =
  7. 7.Round 43177 to the nearest ten.
  8. 8.Which is closest to 1493 ÷ 51? (a) 300 (b) 30 (c) 15 (d) 60
  9. 9.Which is closest to 897 × 21? (Round each number first.) (a) 1800 (b) 18000 (c) 36000 (d) 180000
  10. 10.Round 74859 to the nearest thousand.
  11. 11.Which is closest to 597 × 52? (Round each number first.) (a) 30000 (b) 60000 (c) 300000 (d) 3000
  12. 12.Which is closest to 2404 ÷ 39? (a) 600 (b) 120 (c) 60 (d) 30
  13. 13.Round 97.18 to one decimal place. =
  14. 14.Which is closest to 303 × 39? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  15. 15.Round 10.93 to one decimal place. =
  16. 16.Round 84.79 to one decimal place. =
  17. 17.Which is closest to 497 × 70? (Round each number first.) (a) 350000 (b) 35000 (c) 3500 (d) 70000
  18. 18.Which is closest to 398 + 101 + 601? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  19. 19.Which is closest to 903 × 40? (Round each number first.) (a) 72000 (b) 3600 (c) 360000 (d) 36000
  20. 20.Which is closest to 398 + 898 + 297? (a) 1600 (b) 1500 (c) 1800 (d) 1700
  21. 21.Round 80.19 to one decimal place. =
  22. 22.Which is closest to 2094 ÷ 29? (a) 35 (b) 700 (c) 70 (d) 140
  23. 23.Which is closest to 699 + 205 + 204? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  24. 24.Which is closest to 906 ÷ 31? (a) 15 (b) 300 (c) 60 (d) 30
  25. 25.Which is closest to 501 × 91? (Round each number first.) (a) 4500 (b) 90000 (c) 45000 (d) 450000
  26. 26.Round 23.16 to one decimal place. =
  27. 27.Which is closest to 1198 ÷ 39? (a) 30 (b) 60 (c) 15 (d) 300
  28. 28.Round 48.66 to one decimal place. =
  29. 29.Which is closest to 203 × 31? (Round each number first.) (a) 6000 (b) 600 (c) 60000 (d) 12000
  30. 30.Which is closest to 594 ÷ 19? (a) 300 (b) 60 (c) 15 (d) 30
  31. 31.Which is closest to 2401 ÷ 41? (a) 30 (b) 120 (c) 60 (d) 600
  32. 32.Round 57841 to the nearest ten.
  33. 33.Which is closest to 895 + 799 + 905? (a) 2600 (b) 2800 (c) 2500 (d) 2700
  34. 34.Round 33339 to the nearest thousand.
  35. 35.Round 68136 to the nearest ten.
  36. 36.Which is closest to 1202 ÷ 31? (a) 20 (b) 80 (c) 40 (d) 400
  37. 37.Round 21.77 to one decimal place. =
  38. 38.Which is closest to 497 + 498 + 503? (a) 1600 (b) 1700 (c) 1400 (d) 1500
  39. 39.Which is closest to 299 × 29? (Round each number first.) (a) 18000 (b) 900 (c) 9000 (d) 90000
  40. 40.Round 89.16 to one decimal place. =

Answer key

  1. 68000
  2. 20
  3. 90
  4. 2000
  5. 40470
  6. 59.3
  7. 43180
  8. 30
  9. 18000
  10. 75000
  11. 30000
  12. 60
  13. 97.2
  14. 12000
  15. 10.9
  16. 84.8
  17. 35000
  18. 1100
  19. 36000
  20. 1600
  21. 80.2
  22. 70
  23. 1100
  24. 30
  25. 45000
  26. 23.2
  27. 30
  28. 48.7
  29. 6000
  30. 30
  31. 60
  32. 57840
  33. 2600
  34. 33000
  35. 68140
  36. 40
  37. 21.8
  38. 1500
  39. 9000
  40. 89.2

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