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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 486 · 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 1207 ÷ 21? (a) 120 (b) 30 (c) 600 (d) 60
  2. 2.Which is closest to 803 × 88? (Round each number first.) (a) 720000 (b) 144000 (c) 72000 (d) 7200
  3. 3.Which is closest to 800 × 79? (Round each number first.) (a) 128000 (b) 64000 (c) 6400 (d) 640000
  4. 4.Round 72.58 to one decimal place. =
  5. 5.Round 13.59 to one decimal place. =
  6. 6.Which is closest to 501 × 90? (Round each number first.) (a) 45000 (b) 90000 (c) 450000 (d) 4500
  7. 7.Which is closest to 304 + 200 + 504? (a) 1000 (b) 1100 (c) 1200 (d) 900
  8. 8.Which is closest to 1798 ÷ 19? (a) 45 (b) 900 (c) 180 (d) 90
  9. 9.Round 90968 to the nearest ten.
  10. 10.Which is closest to 296 × 29? (Round each number first.) (a) 18000 (b) 900 (c) 9000 (d) 90000
  11. 11.Which is closest to 297 × 52? (Round each number first.) (a) 30000 (b) 150000 (c) 15000 (d) 1500
  12. 12.Which is closest to 3494 ÷ 49? (a) 700 (b) 140 (c) 35 (d) 70
  13. 13.Which is closest to 100 + 299 + 203? (a) 800 (b) 500 (c) 600 (d) 700
  14. 14.Round 12.67 to one decimal place. =
  15. 15.Which is closest to 799 × 39? (Round each number first.) (a) 64000 (b) 32000 (c) 3200 (d) 320000
  16. 16.Round 87.49 to one decimal place. =
  17. 17.Which is closest to 2399 ÷ 41? (a) 600 (b) 120 (c) 30 (d) 60
  18. 18.Which is closest to 795 + 201 + 696? (a) 1800 (b) 1600 (c) 1900 (d) 1700
  19. 19.Which is closest to 4505 ÷ 49? (a) 90 (b) 900 (c) 180 (d) 45
  20. 20.Which is closest to 897 × 18? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  21. 21.Round 10682 to the nearest hundred.
  22. 22.Round 59.84 to one decimal place. =
  23. 23.Which is closest to 300 × 92? (Round each number first.) (a) 2700 (b) 27000 (c) 54000 (d) 270000
  24. 24.Which is closest to 404 × 51? (Round each number first.) (a) 20000 (b) 2000 (c) 200000 (d) 40000
  25. 25.Which is closest to 606 ÷ 21? (a) 300 (b) 60 (c) 30 (d) 15
  26. 26.Which is closest to 596 × 30? (Round each number first.) (a) 180000 (b) 1800 (c) 18000 (d) 36000
  27. 27.Which is closest to 597 × 29? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
  28. 28.Which is closest to 204 × 51? (Round each number first.) (a) 10000 (b) 100000 (c) 1000 (d) 20000
  29. 29.Which is closest to 704 + 699 + 200? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  30. 30.Which is closest to 899 + 95 + 105? (a) 1300 (b) 1000 (c) 1100 (d) 1200
  31. 31.Round 75.69 to one decimal place. =
  32. 32.Round 29523 to the nearest hundred.
  33. 33.Round 22.27 to one decimal place. =
  34. 34.Round 33190 to the nearest hundred.
  35. 35.Which is closest to 703 + 101 + 204? (a) 900 (b) 1000 (c) 1100 (d) 1200
  36. 36.Round 14855 to the nearest thousand.
  37. 37.Round 83786 to the nearest thousand.
  38. 38.Which is closest to 3008 ÷ 49? (a) 60 (b) 120 (c) 30 (d) 600
  39. 39.Which is closest to 603 ÷ 29? (a) 10 (b) 200 (c) 40 (d) 20
  40. 40.Which is closest to 400 × 19? (Round each number first.) (a) 80000 (b) 800 (c) 16000 (d) 8000

Answer key

  1. 60
  2. 72000
  3. 64000
  4. 72.6
  5. 13.6
  6. 45000
  7. 1000
  8. 90
  9. 90970
  10. 9000
  11. 15000
  12. 70
  13. 600
  14. 12.7
  15. 32000
  16. 87.5
  17. 60
  18. 1700
  19. 90
  20. 18000
  21. 10700
  22. 59.8
  23. 27000
  24. 20000
  25. 30
  26. 18000
  27. 18000
  28. 10000
  29. 1600
  30. 1100
  31. 75.7
  32. 29500
  33. 22.3
  34. 33200
  35. 1000
  36. 15000
  37. 84000
  38. 60
  39. 20
  40. 8000

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