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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 5 · 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 33.61 to one decimal place. =
  2. 2.Which is closest to 703 + 396 + 898? (a) 2200 (b) 2100 (c) 1900 (d) 2000
  3. 3.Which is closest to 901 × 38? (Round each number first.) (a) 36000 (b) 3600 (c) 360000 (d) 72000
  4. 4.Which is closest to 296 + 198 + 695? (a) 1300 (b) 1200 (c) 1100 (d) 1400
  5. 5.Round 3754 to the nearest ten.
  6. 6.Which is closest to 1505 ÷ 51? (a) 60 (b) 15 (c) 300 (d) 30
  7. 7.Round 67.49 to one decimal place. =
  8. 8.Which is closest to 599 ÷ 21? (a) 60 (b) 300 (c) 15 (d) 30
  9. 9.Which is closest to 401 × 28? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
  10. 10.Which is closest to 297 × 39? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
  11. 11.Round 25.78 to one decimal place. =
  12. 12.Which is closest to 504 + 801 + 496? (a) 1700 (b) 1900 (c) 2000 (d) 1800
  13. 13.Which is closest to 908 ÷ 31? (a) 15 (b) 60 (c) 30 (d) 300
  14. 14.Round 80401 to the nearest hundred.
  15. 15.Which is closest to 698 + 300 + 500? (a) 1400 (b) 1700 (c) 1600 (d) 1500
  16. 16.Which is closest to 1809 ÷ 21? (a) 900 (b) 180 (c) 90 (d) 45
  17. 17.Which is closest to 798 + 598 + 895? (a) 2200 (b) 2500 (c) 2300 (d) 2400
  18. 18.Which is closest to 793 ÷ 21? (a) 400 (b) 80 (c) 20 (d) 40
  19. 19.Round 12482 to the nearest hundred.
  20. 20.Round 46.33 to one decimal place. =
  21. 21.Which is closest to 702 × 30? (Round each number first.) (a) 2100 (b) 42000 (c) 21000 (d) 210000
  22. 22.Which is closest to 1204 ÷ 19? (a) 30 (b) 600 (c) 120 (d) 60
  23. 23.Which is closest to 497 + 296 + 597? (a) 1500 (b) 1300 (c) 1600 (d) 1400
  24. 24.Which is closest to 894 ÷ 31? (a) 60 (b) 300 (c) 15 (d) 30
  25. 25.Round 66756 to the nearest thousand.
  26. 26.Which is closest to 700 + 300 + 301? (a) 1200 (b) 1400 (c) 1300 (d) 1500
  27. 27.Which is closest to 1000 ÷ 19? (a) 50 (b) 500 (c) 25 (d) 100
  28. 28.Round 32.84 to one decimal place. =
  29. 29.Round 70.72 to one decimal place. =
  30. 30.Round 20175 to the nearest hundred.
  31. 31.Which is closest to 600 + 404 + 402? (a) 1600 (b) 1400 (c) 1500 (d) 1300
  32. 32.Round 48.82 to one decimal place. =
  33. 33.Round 66.68 to one decimal place. =
  34. 34.Which is closest to 904 ÷ 29? (a) 15 (b) 60 (c) 300 (d) 30
  35. 35.Which is closest to 303 + 696 + 798? (a) 2000 (b) 1800 (c) 1900 (d) 1700
  36. 36.Round 73994 to the nearest ten.
  37. 37.Round 71743 to the nearest thousand.
  38. 38.Which is closest to 1602 ÷ 41? (a) 80 (b) 400 (c) 20 (d) 40
  39. 39.Which is closest to 296 × 22? (Round each number first.) (a) 60000 (b) 600 (c) 6000 (d) 12000
  40. 40.Which is closest to 405 + 900 + 196? (a) 1600 (b) 1500 (c) 1700 (d) 1400

Answer key

  1. 33.6
  2. 2000
  3. 36000
  4. 1200
  5. 3750
  6. 30
  7. 67.5
  8. 30
  9. 12000
  10. 12000
  11. 25.8
  12. 1800
  13. 30
  14. 80400
  15. 1500
  16. 90
  17. 2300
  18. 40
  19. 12500
  20. 46.3
  21. 21000
  22. 60
  23. 1400
  24. 30
  25. 67000
  26. 1300
  27. 50
  28. 32.8
  29. 70.7
  30. 20200
  31. 1400
  32. 48.8
  33. 66.7
  34. 30
  35. 1800
  36. 73990
  37. 72000
  38. 40
  39. 6000
  40. 1500

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