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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 922 · 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 796 × 21? (Round each number first.) (a) 32000 (b) 160000 (c) 16000 (d) 1600
  2. 2.Round 81797 to the nearest ten.
  3. 3.Which is closest to 96 + 499 + 200? (a) 900 (b) 700 (c) 800 (d) 1000
  4. 4.Which is closest to 97 + 401 + 299? (a) 1000 (b) 900 (c) 700 (d) 800
  5. 5.Round 78912 to the nearest ten.
  6. 6.Round 12059 to the nearest thousand.
  7. 7.Round 66963 to the nearest ten.
  8. 8.Which is closest to 1007 ÷ 19? (a) 25 (b) 100 (c) 500 (d) 50
  9. 9.Round 92.39 to one decimal place. =
  10. 10.Which is closest to 198 + 599 + 205? (a) 1200 (b) 1000 (c) 1100 (d) 900
  11. 11.Which is closest to 608 ÷ 21? (a) 15 (b) 300 (c) 30 (d) 60
  12. 12.Which is closest to 198 × 62? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  13. 13.Round 45.66 to one decimal place. =
  14. 14.Round 99.46 to one decimal place. =
  15. 15.Which is closest to 798 × 48? (Round each number first.) (a) 400000 (b) 80000 (c) 40000 (d) 4000
  16. 16.Round 36.57 to one decimal place. =
  17. 17.Round 8651 to the nearest ten.
  18. 18.Which is closest to 596 + 195 + 402? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  19. 19.Round 21.62 to one decimal place. =
  20. 20.Which is closest to 397 + 496 + 495? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  21. 21.Which is closest to 1795 ÷ 31? (a) 600 (b) 60 (c) 30 (d) 120
  22. 22.Which is closest to 904 × 61? (Round each number first.) (a) 108000 (b) 54000 (c) 5400 (d) 540000
  23. 23.Which is closest to 900 + 895 + 100? (a) 2000 (b) 2100 (c) 1900 (d) 1800
  24. 24.Round 68.53 to one decimal place. =
  25. 25.Which is closest to 801 + 398 + 396? (a) 1800 (b) 1700 (c) 1600 (d) 1500
  26. 26.Which is closest to 600 + 503 + 704? (a) 2000 (b) 1800 (c) 1700 (d) 1900
  27. 27.Which is closest to 304 × 30? (Round each number first.) (a) 900 (b) 18000 (c) 9000 (d) 90000
  28. 28.Round 53.77 to one decimal place. =
  29. 29.Which is closest to 1509 ÷ 31? (a) 25 (b) 50 (c) 500 (d) 100
  30. 30.Which is closest to 303 × 49? (Round each number first.) (a) 15000 (b) 1500 (c) 30000 (d) 150000
  31. 31.Which is closest to 299 × 42? (Round each number first.) (a) 1200 (b) 24000 (c) 12000 (d) 120000
  32. 32.Which is closest to 702 × 91? (Round each number first.) (a) 6300 (b) 63000 (c) 126000 (d) 630000
  33. 33.Which is closest to 503 × 78? (Round each number first.) (a) 80000 (b) 4000 (c) 40000 (d) 400000
  34. 34.Round 74832 to the nearest hundred.
  35. 35.Which is closest to 200 × 79? (Round each number first.) (a) 1600 (b) 160000 (c) 32000 (d) 16000
  36. 36.Which is closest to 598 × 69? (Round each number first.) (a) 84000 (b) 4200 (c) 42000 (d) 420000
  37. 37.Round 16146 to the nearest hundred.
  38. 38.Round 94820 to the nearest thousand.
  39. 39.Round 34.17 to one decimal place. =
  40. 40.Which is closest to 700 × 68? (Round each number first.) (a) 98000 (b) 49000 (c) 490000 (d) 4900

Answer key

  1. 16000
  2. 81800
  3. 800
  4. 800
  5. 78910
  6. 12000
  7. 66960
  8. 50
  9. 92.4
  10. 1000
  11. 30
  12. 12000
  13. 45.7
  14. 99.5
  15. 40000
  16. 36.6
  17. 8650
  18. 1200
  19. 21.6
  20. 1400
  21. 60
  22. 54000
  23. 1900
  24. 68.5
  25. 1600
  26. 1800
  27. 9000
  28. 53.8
  29. 50
  30. 15000
  31. 12000
  32. 63000
  33. 40000
  34. 74800
  35. 16000
  36. 42000
  37. 16100
  38. 95000
  39. 34.2
  40. 49000

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