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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 263 · 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 83438 to the nearest ten.
  2. 2.Which is closest to 696 × 51? (Round each number first.) (a) 350000 (b) 3500 (c) 70000 (d) 35000
  3. 3.Which is closest to 196 × 61? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  4. 4.Which is closest to 495 + 599 + 101? (a) 1300 (b) 1100 (c) 1200 (d) 1400
  5. 5.Which is closest to 597 × 22? (Round each number first.) (a) 1200 (b) 24000 (c) 120000 (d) 12000
  6. 6.Which is closest to 202 × 80? (Round each number first.) (a) 32000 (b) 1600 (c) 160000 (d) 16000
  7. 7.Which is closest to 197 + 903 + 404? (a) 1600 (b) 1700 (c) 1500 (d) 1400
  8. 8.Which is closest to 296 × 21? (Round each number first.) (a) 12000 (b) 6000 (c) 60000 (d) 600
  9. 9.Round 26754 to the nearest thousand.
  10. 10.Round 37.56 to one decimal place. =
  11. 11.Which is closest to 896 × 62? (Round each number first.) (a) 540000 (b) 5400 (c) 54000 (d) 108000
  12. 12.Which is closest to 2995 ÷ 49? (a) 120 (b) 60 (c) 600 (d) 30
  13. 13.Which is closest to 791 ÷ 21? (a) 80 (b) 20 (c) 40 (d) 400
  14. 14.Which is closest to 605 ÷ 29? (a) 10 (b) 200 (c) 40 (d) 20
  15. 15.Which is closest to 197 + 896 + 205? (a) 1400 (b) 1500 (c) 1300 (d) 1200
  16. 16.Round 15.77 to one decimal place. =
  17. 17.Which is closest to 594 ÷ 31? (a) 40 (b) 20 (c) 200 (d) 10
  18. 18.Round 15900 to the nearest thousand.
  19. 19.Round 94589 to the nearest ten.
  20. 20.Which is closest to 297 × 52? (Round each number first.) (a) 30000 (b) 15000 (c) 150000 (d) 1500
  21. 21.Which is closest to 296 × 28? (Round each number first.) (a) 90000 (b) 18000 (c) 900 (d) 9000
  22. 22.Which is closest to 104 + 597 + 798? (a) 1600 (b) 1400 (c) 1700 (d) 1500
  23. 23.Round 88986 to the nearest thousand.
  24. 24.Round 77037 to the nearest hundred.
  25. 25.Which is closest to 204 × 18? (Round each number first.) (a) 4000 (b) 40000 (c) 8000 (d) 400
  26. 26.Which is closest to 98 + 104 + 403? (a) 500 (b) 600 (c) 700 (d) 800
  27. 27.Which is closest to 603 ÷ 21? (a) 15 (b) 30 (c) 60 (d) 300
  28. 28.Which is closest to 2808 ÷ 41? (a) 700 (b) 35 (c) 140 (d) 70
  29. 29.Round 86.09 to one decimal place. =
  30. 30.Round 20994 to the nearest hundred.
  31. 31.Which is closest to 793 ÷ 39? (a) 10 (b) 200 (c) 40 (d) 20
  32. 32.Which is closest to 4506 ÷ 51? (a) 45 (b) 90 (c) 900 (d) 180
  33. 33.Which is closest to 198 × 60? (Round each number first.) (a) 12000 (b) 120000 (c) 1200 (d) 24000
  34. 34.Round 20.67 to one decimal place. =
  35. 35.Round 86.21 to one decimal place. =
  36. 36.Which is closest to 297 × 20? (Round each number first.) (a) 600 (b) 60000 (c) 12000 (d) 6000
  37. 37.Which is closest to 799 + 900 + 905? (a) 2600 (b) 2800 (c) 2500 (d) 2700
  38. 38.Round 14801 to the nearest ten.
  39. 39.Which is closest to 704 × 40? (Round each number first.) (a) 2800 (b) 28000 (c) 280000 (d) 56000
  40. 40.Which is closest to 3196 ÷ 39? (a) 160 (b) 40 (c) 800 (d) 80

Answer key

  1. 83440
  2. 35000
  3. 12000
  4. 1200
  5. 12000
  6. 16000
  7. 1500
  8. 6000
  9. 27000
  10. 37.6
  11. 54000
  12. 60
  13. 40
  14. 20
  15. 1300
  16. 15.8
  17. 20
  18. 16000
  19. 94590
  20. 15000
  21. 9000
  22. 1500
  23. 89000
  24. 77000
  25. 4000
  26. 600
  27. 30
  28. 70
  29. 86.1
  30. 21000
  31. 20
  32. 90
  33. 12000
  34. 20.7
  35. 86.2
  36. 6000
  37. 2600
  38. 14800
  39. 28000
  40. 80

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