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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 210 · 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 35306 to the nearest thousand.
  2. 2.Which is closest to 402 × 32? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  3. 3.Round 6876 to the nearest hundred.
  4. 4.Round 37.64 to one decimal place. =
  5. 5.Which is closest to 901 + 503 + 201? (a) 1600 (b) 1500 (c) 1800 (d) 1700
  6. 6.Which is closest to 700 × 59? (Round each number first.) (a) 42000 (b) 420000 (c) 4200 (d) 84000
  7. 7.Round 40343 to the nearest hundred.
  8. 8.Which is closest to 504 × 92? (Round each number first.) (a) 450000 (b) 45000 (c) 90000 (d) 4500
  9. 9.Which is closest to 1805 ÷ 19? (a) 45 (b) 90 (c) 900 (d) 180
  10. 10.Round 99575 to the nearest hundred.
  11. 11.Round 68.64 to one decimal place. =
  12. 12.Round 72.93 to one decimal place. =
  13. 13.Round 26.78 to one decimal place. =
  14. 14.Round 22.19 to one decimal place. =
  15. 15.Which is closest to 897 × 29? (Round each number first.) (a) 270000 (b) 2700 (c) 54000 (d) 27000
  16. 16.Round 78002 to the nearest thousand.
  17. 17.Which is closest to 595 + 295 + 404? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  18. 18.Which is closest to 397 + 404 + 898? (a) 1600 (b) 1800 (c) 1700 (d) 1900
  19. 19.Round 12643 to the nearest ten.
  20. 20.Round 97.38 to one decimal place. =
  21. 21.Which is closest to 699 × 51? (Round each number first.) (a) 3500 (b) 35000 (c) 350000 (d) 70000
  22. 22.Which is closest to 704 + 402 + 601? (a) 1600 (b) 1800 (c) 1900 (d) 1700
  23. 23.Which is closest to 900 × 92? (Round each number first.) (a) 81000 (b) 8100 (c) 810000 (d) 162000
  24. 24.Which is closest to 297 × 39? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
  25. 25.Round 89.14 to one decimal place. =
  26. 26.Round 53.33 to one decimal place. =
  27. 27.Round 34.52 to one decimal place. =
  28. 28.Round 6669 to the nearest hundred.
  29. 29.Which is closest to 598 + 895 + 805? (a) 2500 (b) 2300 (c) 2200 (d) 2400
  30. 30.Which is closest to 3004 ÷ 51? (a) 60 (b) 600 (c) 120 (d) 30
  31. 31.Round 74.16 to one decimal place. =
  32. 32.Round 73938 to the nearest thousand.
  33. 33.Round 7664 to the nearest hundred.
  34. 34.Which is closest to 2705 ÷ 29? (a) 180 (b) 900 (c) 90 (d) 45
  35. 35.Which is closest to 796 + 199 + 400? (a) 1500 (b) 1600 (c) 1400 (d) 1300
  36. 36.Round 53.64 to one decimal place. =
  37. 37.Which is closest to 1396 ÷ 19? (a) 140 (b) 70 (c) 700 (d) 35
  38. 38.Which is closest to 896 × 48? (Round each number first.) (a) 4500 (b) 90000 (c) 450000 (d) 45000
  39. 39.Round 85079 to the nearest ten.
  40. 40.Which is closest to 405 + 600 + 800? (a) 1800 (b) 1900 (c) 2000 (d) 1700

Answer key

  1. 35000
  2. 12000
  3. 6900
  4. 37.6
  5. 1600
  6. 42000
  7. 40300
  8. 45000
  9. 90
  10. 99600
  11. 68.6
  12. 72.9
  13. 26.8
  14. 22.2
  15. 27000
  16. 78000
  17. 1300
  18. 1700
  19. 12640
  20. 97.4
  21. 35000
  22. 1700
  23. 81000
  24. 12000
  25. 89.1
  26. 53.3
  27. 34.5
  28. 6700
  29. 2300
  30. 60
  31. 74.2
  32. 74000
  33. 7700
  34. 90
  35. 1400
  36. 53.6
  37. 70
  38. 45000
  39. 85080
  40. 1800

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