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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 110 · 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 68.69 to one decimal place. =
  2. 2.Which is closest to 698 × 62? (Round each number first.) (a) 42000 (b) 4200 (c) 84000 (d) 420000
  3. 3.Round 10536 to the nearest hundred.
  4. 4.Which is closest to 1994 ÷ 51? (a) 400 (b) 80 (c) 40 (d) 20
  5. 5.Which is closest to 704 × 92? (Round each number first.) (a) 63000 (b) 126000 (c) 630000 (d) 6300
  6. 6.Which is closest to 799 ÷ 21? (a) 20 (b) 40 (c) 400 (d) 80
  7. 7.Which is closest to 1593 ÷ 21? (a) 40 (b) 160 (c) 80 (d) 800
  8. 8.Round 44.92 to one decimal place. =
  9. 9.Which is closest to 795 ÷ 19? (a) 80 (b) 40 (c) 400 (d) 20
  10. 10.Round 52181 to the nearest hundred.
  11. 11.Which is closest to 299 × 40? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  12. 12.Round 85.06 to one decimal place. =
  13. 13.Which is closest to 403 × 79? (Round each number first.) (a) 64000 (b) 3200 (c) 32000 (d) 320000
  14. 14.Which is closest to 2392 ÷ 39? (a) 600 (b) 120 (c) 30 (d) 60
  15. 15.Which is closest to 1492 ÷ 49? (a) 60 (b) 300 (c) 30 (d) 15
  16. 16.Round 15.66 to one decimal place. =
  17. 17.Round 78989 to the nearest hundred.
  18. 18.Which is closest to 899 + 195 + 597? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  19. 19.Which is closest to 1505 ÷ 49? (a) 30 (b) 15 (c) 300 (d) 60
  20. 20.Which is closest to 3506 ÷ 49? (a) 35 (b) 700 (c) 70 (d) 140
  21. 21.Which is closest to 2997 ÷ 51? (a) 600 (b) 60 (c) 30 (d) 120
  22. 22.Which is closest to 796 × 91? (Round each number first.) (a) 144000 (b) 72000 (c) 7200 (d) 720000
  23. 23.Which is closest to 799 × 91? (Round each number first.) (a) 7200 (b) 144000 (c) 72000 (d) 720000
  24. 24.Which is closest to 795 + 195 + 299? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  25. 25.Which is closest to 498 × 62? (Round each number first.) (a) 30000 (b) 60000 (c) 300000 (d) 3000
  26. 26.Which is closest to 304 × 90? (Round each number first.) (a) 27000 (b) 54000 (c) 2700 (d) 270000
  27. 27.Which is closest to 201 + 603 + 503? (a) 1400 (b) 1300 (c) 1200 (d) 1500
  28. 28.Round 69538 to the nearest thousand.
  29. 29.Which is closest to 98 + 898 + 496? (a) 1500 (b) 1600 (c) 1700 (d) 1400
  30. 30.Which is closest to 303 × 91? (Round each number first.) (a) 27000 (b) 270000 (c) 54000 (d) 2700
  31. 31.Round 73593 to the nearest hundred.
  32. 32.Which is closest to 700 × 51? (Round each number first.) (a) 3500 (b) 350000 (c) 70000 (d) 35000
  33. 33.Which is closest to 103 + 102 + 300? (a) 700 (b) 600 (c) 500 (d) 400
  34. 34.Which is closest to 898 × 90? (Round each number first.) (a) 81000 (b) 8100 (c) 162000 (d) 810000
  35. 35.Round 50304 to the nearest thousand.
  36. 36.Round 20.63 to one decimal place. =
  37. 37.Round 16.66 to one decimal place. =
  38. 38.Round 24316 to the nearest hundred.
  39. 39.Which is closest to 296 × 38? (Round each number first.) (a) 1200 (b) 12000 (c) 120000 (d) 24000
  40. 40.Which is closest to 197 × 39? (Round each number first.) (a) 16000 (b) 800 (c) 8000 (d) 80000

Answer key

  1. 68.7
  2. 42000
  3. 10500
  4. 40
  5. 63000
  6. 40
  7. 80
  8. 44.9
  9. 40
  10. 52200
  11. 12000
  12. 85.1
  13. 32000
  14. 60
  15. 30
  16. 15.7
  17. 79000
  18. 1700
  19. 30
  20. 70
  21. 60
  22. 72000
  23. 72000
  24. 1300
  25. 30000
  26. 27000
  27. 1300
  28. 70000
  29. 1500
  30. 27000
  31. 73600
  32. 35000
  33. 500
  34. 81000
  35. 50000
  36. 20.6
  37. 16.7
  38. 24300
  39. 12000
  40. 8000

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