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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 866 · 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 205 + 104 + 396? (a) 600 (b) 700 (c) 800 (d) 900
  2. 2.Round 17.21 to one decimal place. =
  3. 3.Round 42.09 to one decimal place. =
  4. 4.Which is closest to 1609 ÷ 41? (a) 400 (b) 80 (c) 40 (d) 20
  5. 5.Round 42687 to the nearest hundred.
  6. 6.Round 26.37 to one decimal place. =
  7. 7.Which is closest to 697 + 601 + 903? (a) 2300 (b) 2400 (c) 2100 (d) 2200
  8. 8.Which is closest to 1398 ÷ 19? (a) 140 (b) 70 (c) 700 (d) 35
  9. 9.Round 17.68 to one decimal place. =
  10. 10.Round 8505 to the nearest hundred.
  11. 11.Which is closest to 496 + 804 + 398? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  12. 12.Which is closest to 1797 ÷ 31? (a) 600 (b) 120 (c) 30 (d) 60
  13. 13.Which is closest to 1506 ÷ 49? (a) 300 (b) 15 (c) 30 (d) 60
  14. 14.Round 64810 to the nearest thousand.
  15. 15.Which is closest to 503 + 605 + 600? (a) 1700 (b) 1900 (c) 1600 (d) 1800
  16. 16.Round 23438 to the nearest hundred.
  17. 17.Round 67.68 to one decimal place. =
  18. 18.Which is closest to 1603 ÷ 41? (a) 400 (b) 80 (c) 20 (d) 40
  19. 19.Which is closest to 399 × 78? (Round each number first.) (a) 320000 (b) 3200 (c) 64000 (d) 32000
  20. 20.Round 41.33 to one decimal place. =
  21. 21.Which is closest to 897 × 58? (Round each number first.) (a) 5400 (b) 540000 (c) 108000 (d) 54000
  22. 22.Which is closest to 898 × 61? (Round each number first.) (a) 5400 (b) 54000 (c) 108000 (d) 540000
  23. 23.Which is closest to 104 + 704 + 898? (a) 1700 (b) 1900 (c) 1800 (d) 1600
  24. 24.Which is closest to 404 + 498 + 305? (a) 1100 (b) 1400 (c) 1300 (d) 1200
  25. 25.Round 41.94 to one decimal place. =
  26. 26.Round 77236 to the nearest thousand.
  27. 27.Round 2263 to the nearest ten.
  28. 28.Round 13613 to the nearest thousand.
  29. 29.Which is closest to 1191 ÷ 19? (a) 120 (b) 30 (c) 60 (d) 600
  30. 30.Which is closest to 98 + 97 + 502? (a) 800 (b) 700 (c) 600 (d) 900
  31. 31.Round 96334 to the nearest thousand.
  32. 32.Which is closest to 705 + 796 + 397? (a) 2100 (b) 1800 (c) 1900 (d) 2000
  33. 33.Round 4264 to the nearest ten.
  34. 34.Round 80012 to the nearest ten.
  35. 35.Which is closest to 499 + 302 + 405? (a) 1100 (b) 1400 (c) 1200 (d) 1300
  36. 36.Which is closest to 899 × 19? (Round each number first.) (a) 180000 (b) 36000 (c) 18000 (d) 1800
  37. 37.Round 32625 to the nearest thousand.
  38. 38.Round 88427 to the nearest hundred.
  39. 39.Round 30.06 to one decimal place. =
  40. 40.Which is closest to 195 + 101 + 605? (a) 1000 (b) 800 (c) 900 (d) 1100

Answer key

  1. 700
  2. 17.2
  3. 42.1
  4. 40
  5. 42700
  6. 26.4
  7. 2200
  8. 70
  9. 17.7
  10. 8500
  11. 1700
  12. 60
  13. 30
  14. 65000
  15. 1700
  16. 23400
  17. 67.7
  18. 40
  19. 32000
  20. 41.3
  21. 54000
  22. 54000
  23. 1700
  24. 1200
  25. 41.9
  26. 77000
  27. 2260
  28. 14000
  29. 60
  30. 700
  31. 96000
  32. 1900
  33. 4260
  34. 80010
  35. 1200
  36. 18000
  37. 33000
  38. 88400
  39. 30.1
  40. 900

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