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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 427 · 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 297 + 301 + 596? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  2. 2.Round 40.86 to one decimal place. =
  3. 3.Which is closest to 502 × 92? (Round each number first.) (a) 90000 (b) 45000 (c) 4500 (d) 450000
  4. 4.Which is closest to 702 + 695 + 199? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  5. 5.Which is closest to 2403 ÷ 31? (a) 800 (b) 40 (c) 80 (d) 160
  6. 6.Which is closest to 1491 ÷ 51? (a) 15 (b) 60 (c) 300 (d) 30
  7. 7.Which is closest to 705 + 903 + 103? (a) 1600 (b) 1800 (c) 1700 (d) 1900
  8. 8.Round 4577 to the nearest ten.
  9. 9.Round 12.56 to one decimal place. =
  10. 10.Round 26.16 to one decimal place. =
  11. 11.Round 23.18 to one decimal place. =
  12. 12.Round 84.13 to one decimal place. =
  13. 13.Which is closest to 1595 ÷ 19? (a) 80 (b) 40 (c) 160 (d) 800
  14. 14.Which is closest to 297 × 59? (Round each number first.) (a) 36000 (b) 18000 (c) 1800 (d) 180000
  15. 15.Which is closest to 502 + 605 + 903? (a) 2200 (b) 2000 (c) 2100 (d) 1900
  16. 16.Which is closest to 896 × 21? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  17. 17.Which is closest to 302 + 299 + 902? (a) 1500 (b) 1600 (c) 1400 (d) 1700
  18. 18.Which is closest to 298 × 28? (Round each number first.) (a) 18000 (b) 9000 (c) 90000 (d) 900
  19. 19.Which is closest to 698 × 78? (Round each number first.) (a) 56000 (b) 560000 (c) 5600 (d) 112000
  20. 20.Round 22.29 to one decimal place. =
  21. 21.Which is closest to 604 + 199 + 196? (a) 900 (b) 1200 (c) 1100 (d) 1000
  22. 22.Round 18.26 to one decimal place. =
  23. 23.Which is closest to 404 ÷ 19? (a) 200 (b) 10 (c) 20 (d) 40
  24. 24.Round 67004 to the nearest hundred.
  25. 25.Which is closest to 598 × 70? (Round each number first.) (a) 4200 (b) 420000 (c) 84000 (d) 42000
  26. 26.Which is closest to 296 + 805 + 102? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  27. 27.Round 36659 to the nearest hundred.
  28. 28.Which is closest to 697 × 82? (Round each number first.) (a) 560000 (b) 5600 (c) 56000 (d) 112000
  29. 29.Which is closest to 896 × 39? (Round each number first.) (a) 72000 (b) 36000 (c) 3600 (d) 360000
  30. 30.Which is closest to 301 × 88? (Round each number first.) (a) 27000 (b) 270000 (c) 54000 (d) 2700
  31. 31.Round 26.34 to one decimal place. =
  32. 32.Which is closest to 403 × 88? (Round each number first.) (a) 360000 (b) 3600 (c) 36000 (d) 72000
  33. 33.Which is closest to 397 × 68? (Round each number first.) (a) 28000 (b) 2800 (c) 56000 (d) 280000
  34. 34.Round 83.61 to one decimal place. =
  35. 35.Which is closest to 1994 ÷ 39? (a) 50 (b) 25 (c) 100 (d) 500
  36. 36.Which is closest to 703 × 88? (Round each number first.) (a) 126000 (b) 63000 (c) 630000 (d) 6300
  37. 37.Round 41.82 to one decimal place. =
  38. 38.Round 32.58 to one decimal place. =
  39. 39.Round 78808 to the nearest ten.
  40. 40.Round 11.39 to one decimal place. =

Answer key

  1. 1200
  2. 40.9
  3. 45000
  4. 1600
  5. 80
  6. 30
  7. 1700
  8. 4580
  9. 12.6
  10. 26.2
  11. 23.2
  12. 84.1
  13. 80
  14. 18000
  15. 2000
  16. 18000
  17. 1500
  18. 9000
  19. 56000
  20. 22.3
  21. 1000
  22. 18.3
  23. 20
  24. 67000
  25. 42000
  26. 1200
  27. 36700
  28. 56000
  29. 36000
  30. 27000
  31. 26.3
  32. 36000
  33. 28000
  34. 83.6
  35. 50
  36. 63000
  37. 41.8
  38. 32.6
  39. 78810
  40. 11.4

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