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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 530 · 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 104 + 398 + 897? (a) 1400 (b) 1600 (c) 1300 (d) 1500
  2. 2.Which is closest to 905 + 601 + 201? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  3. 3.Which is closest to 704 × 80? (Round each number first.) (a) 112000 (b) 5600 (c) 56000 (d) 560000
  4. 4.Which is closest to 296 + 105 + 399? (a) 1000 (b) 900 (c) 700 (d) 800
  5. 5.Which is closest to 1208 ÷ 19? (a) 60 (b) 120 (c) 30 (d) 600
  6. 6.Which is closest to 299 × 61? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  7. 7.Round 96157 to the nearest hundred.
  8. 8.Which is closest to 396 × 51? (Round each number first.) (a) 200000 (b) 2000 (c) 40000 (d) 20000
  9. 9.Which is closest to 796 ÷ 19? (a) 20 (b) 80 (c) 400 (d) 40
  10. 10.Which is closest to 896 + 796 + 200? (a) 1900 (b) 2000 (c) 1800 (d) 2100
  11. 11.Which is closest to 603 × 18? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
  12. 12.Round 57397 to the nearest thousand.
  13. 13.Round 92.89 to one decimal place. =
  14. 14.Round 46.53 to one decimal place. =
  15. 15.Which is closest to 594 ÷ 21? (a) 15 (b) 60 (c) 30 (d) 300
  16. 16.Round 87409 to the nearest hundred.
  17. 17.Which is closest to 497 + 401 + 298? (a) 1200 (b) 1300 (c) 1100 (d) 1400
  18. 18.Round 16.82 to one decimal place. =
  19. 19.Which is closest to 705 + 502 + 597? (a) 2000 (b) 1800 (c) 1700 (d) 1900
  20. 20.Which is closest to 1403 ÷ 21? (a) 70 (b) 35 (c) 140 (d) 700
  21. 21.Round 75.52 to one decimal place. =
  22. 22.Which is closest to 602 ÷ 19? (a) 60 (b) 300 (c) 15 (d) 30
  23. 23.Round 51.16 to one decimal place. =
  24. 24.Which is closest to 504 + 500 + 100? (a) 1000 (b) 1100 (c) 1300 (d) 1200
  25. 25.Which is closest to 799 × 31? (Round each number first.) (a) 240000 (b) 48000 (c) 24000 (d) 2400
  26. 26.Which is closest to 899 × 92? (Round each number first.) (a) 81000 (b) 162000 (c) 8100 (d) 810000
  27. 27.Which is closest to 95 + 301 + 97? (a) 500 (b) 700 (c) 600 (d) 400
  28. 28.Which is closest to 3600 ÷ 39? (a) 900 (b) 180 (c) 90 (d) 45
  29. 29.Which is closest to 898 + 604 + 500? (a) 2100 (b) 1900 (c) 2000 (d) 2200
  30. 30.Round 15727 to the nearest ten.
  31. 31.Round 14.48 to one decimal place. =
  32. 32.Which is closest to 800 + 197 + 696? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  33. 33.Round 94.79 to one decimal place. =
  34. 34.Round 48.23 to one decimal place. =
  35. 35.Which is closest to 503 × 70? (Round each number first.) (a) 3500 (b) 350000 (c) 35000 (d) 70000
  36. 36.Round 24.16 to one decimal place. =
  37. 37.Round 38.83 to one decimal place. =
  38. 38.Which is closest to 698 + 600 + 399? (a) 1600 (b) 1800 (c) 1900 (d) 1700
  39. 39.Round 77.59 to one decimal place. =
  40. 40.Which is closest to 497 × 38? (Round each number first.) (a) 20000 (b) 40000 (c) 200000 (d) 2000

Answer key

  1. 1400
  2. 1700
  3. 56000
  4. 800
  5. 60
  6. 18000
  7. 96200
  8. 20000
  9. 40
  10. 1900
  11. 12000
  12. 57000
  13. 92.9
  14. 46.5
  15. 30
  16. 87400
  17. 1200
  18. 16.8
  19. 1800
  20. 70
  21. 75.5
  22. 30
  23. 51.2
  24. 1100
  25. 24000
  26. 81000
  27. 500
  28. 90
  29. 2000
  30. 15730
  31. 14.5
  32. 1700
  33. 94.8
  34. 48.2
  35. 35000
  36. 24.2
  37. 38.8
  38. 1700
  39. 77.6
  40. 20000

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