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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 14 · 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 402 × 30? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  2. 2.Round 61.12 to one decimal place. =
  3. 3.Round 21.36 to one decimal place. =
  4. 4.Round 78276 to the nearest thousand.
  5. 5.Which is closest to 1798 ÷ 29? (a) 600 (b) 60 (c) 30 (d) 120
  6. 6.Which is closest to 496 × 30? (Round each number first.) (a) 1500 (b) 30000 (c) 15000 (d) 150000
  7. 7.Which is closest to 801 × 59? (Round each number first.) (a) 96000 (b) 480000 (c) 4800 (d) 48000
  8. 8.Round 33.57 to one decimal place. =
  9. 9.Which is closest to 398 + 600 + 700? (a) 1900 (b) 1600 (c) 1800 (d) 1700
  10. 10.Which is closest to 898 + 402 + 803? (a) 2100 (b) 2000 (c) 2200 (d) 2300
  11. 11.Round 19316 to the nearest ten.
  12. 12.Round 97.29 to one decimal place. =
  13. 13.Which is closest to 597 + 102 + 400? (a) 1000 (b) 1300 (c) 1100 (d) 1200
  14. 14.Which is closest to 2101 ÷ 31? (a) 70 (b) 35 (c) 700 (d) 140
  15. 15.Round 90365 to the nearest hundred.
  16. 16.Round 32.48 to one decimal place. =
  17. 17.Round 7077 to the nearest ten.
  18. 18.Which is closest to 805 + 103 + 296? (a) 1100 (b) 1400 (c) 1200 (d) 1300
  19. 19.Round 20.89 to one decimal place. =
  20. 20.Which is closest to 503 × 30? (Round each number first.) (a) 1500 (b) 30000 (c) 15000 (d) 150000
  21. 21.Round 92.69 to one decimal place. =
  22. 22.Round 64.38 to one decimal place. =
  23. 23.Round 77.27 to one decimal place. =
  24. 24.Round 19.44 to one decimal place. =
  25. 25.Round 89.94 to one decimal place. =
  26. 26.Which is closest to 903 ÷ 29? (a) 60 (b) 300 (c) 30 (d) 15
  27. 27.Round 34.92 to one decimal place. =
  28. 28.Round 64.29 to one decimal place. =
  29. 29.Which is closest to 199 × 50? (Round each number first.) (a) 10000 (b) 1000 (c) 100000 (d) 20000
  30. 30.Round 23.39 to one decimal place. =
  31. 31.Which is closest to 900 × 29? (Round each number first.) (a) 27000 (b) 54000 (c) 270000 (d) 2700
  32. 32.Round 26.78 to one decimal place. =
  33. 33.Round 36.41 to one decimal place. =
  34. 34.Which is closest to 1001 ÷ 21? (a) 25 (b) 50 (c) 100 (d) 500
  35. 35.Round 71.17 to one decimal place. =
  36. 36.Round 70.19 to one decimal place. =
  37. 37.Round 45.07 to one decimal place. =
  38. 38.Which is closest to 300 + 902 + 696? (a) 2000 (b) 1900 (c) 1800 (d) 2100
  39. 39.Which is closest to 904 + 202 + 897? (a) 2200 (b) 1900 (c) 2000 (d) 2100
  40. 40.Which is closest to 301 × 90? (Round each number first.) (a) 27000 (b) 54000 (c) 2700 (d) 270000

Answer key

  1. 12000
  2. 61.1
  3. 21.4
  4. 78000
  5. 60
  6. 15000
  7. 48000
  8. 33.6
  9. 1700
  10. 2100
  11. 19320
  12. 97.3
  13. 1100
  14. 70
  15. 90400
  16. 32.5
  17. 7080
  18. 1200
  19. 20.9
  20. 15000
  21. 92.7
  22. 64.4
  23. 77.3
  24. 19.4
  25. 89.9
  26. 30
  27. 34.9
  28. 64.3
  29. 10000
  30. 23.4
  31. 27000
  32. 26.8
  33. 36.4
  34. 50
  35. 71.2
  36. 70.2
  37. 45.1
  38. 1900
  39. 2000
  40. 27000

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