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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 831 · 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 26.59 to one decimal place. =
  2. 2.Round 49.43 to one decimal place. =
  3. 3.Round 95084 to the nearest thousand.
  4. 4.Round 30346 to the nearest ten.
  5. 5.Round 85.52 to one decimal place. =
  6. 6.Round 75.24 to one decimal place. =
  7. 7.Which is closest to 1792 ÷ 29? (a) 30 (b) 60 (c) 600 (d) 120
  8. 8.Round 27.12 to one decimal place. =
  9. 9.Which is closest to 203 × 52? (Round each number first.) (a) 100000 (b) 1000 (c) 10000 (d) 20000
  10. 10.Round 97.83 to one decimal place. =
  11. 11.Which is closest to 196 × 72? (Round each number first.) (a) 14000 (b) 28000 (c) 1400 (d) 140000
  12. 12.Which is closest to 499 × 88? (Round each number first.) (a) 450000 (b) 90000 (c) 4500 (d) 45000
  13. 13.Round 64.43 to one decimal place. =
  14. 14.Round 30851 to the nearest ten.
  15. 15.Which is closest to 696 + 798 + 502? (a) 1900 (b) 2000 (c) 2100 (d) 2200
  16. 16.Round 38.54 to one decimal place. =
  17. 17.Round 27.13 to one decimal place. =
  18. 18.Round 19126 to the nearest ten.
  19. 19.Which is closest to 502 × 29? (Round each number first.) (a) 30000 (b) 150000 (c) 15000 (d) 1500
  20. 20.Round 61018 to the nearest thousand.
  21. 21.Which is closest to 602 × 90? (Round each number first.) (a) 5400 (b) 54000 (c) 540000 (d) 108000
  22. 22.Round 72.33 to one decimal place. =
  23. 23.Round 34.12 to one decimal place. =
  24. 24.Round 34.44 to one decimal place. =
  25. 25.Which is closest to 392 ÷ 19? (a) 200 (b) 20 (c) 40 (d) 10
  26. 26.Which is closest to 1794 ÷ 29? (a) 120 (b) 30 (c) 600 (d) 60
  27. 27.Which is closest to 3505 ÷ 51? (a) 140 (b) 700 (c) 35 (d) 70
  28. 28.Which is closest to 900 + 495 + 399? (a) 1700 (b) 1900 (c) 2000 (d) 1800
  29. 29.Round 59102 to the nearest ten.
  30. 30.Which is closest to 2792 ÷ 41? (a) 700 (b) 35 (c) 70 (d) 140
  31. 31.Round 66893 to the nearest ten.
  32. 32.Which is closest to 201 × 20? (Round each number first.) (a) 40000 (b) 400 (c) 4000 (d) 8000
  33. 33.Which is closest to 500 + 295 + 804? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  34. 34.Which is closest to 705 + 595 + 695? (a) 2200 (b) 2100 (c) 2000 (d) 1900
  35. 35.Which is closest to 993 ÷ 49? (a) 20 (b) 200 (c) 40 (d) 10
  36. 36.Which is closest to 102 + 802 + 704? (a) 1600 (b) 1800 (c) 1700 (d) 1500
  37. 37.Which is closest to 198 × 68? (Round each number first.) (a) 1400 (b) 14000 (c) 140000 (d) 28000
  38. 38.Round 71.64 to one decimal place. =
  39. 39.Which is closest to 606 ÷ 21? (a) 300 (b) 30 (c) 60 (d) 15
  40. 40.Round 28.41 to one decimal place. =

Answer key

  1. 26.6
  2. 49.4
  3. 95000
  4. 30350
  5. 85.5
  6. 75.2
  7. 60
  8. 27.1
  9. 10000
  10. 97.8
  11. 14000
  12. 45000
  13. 64.4
  14. 30850
  15. 2000
  16. 38.5
  17. 27.1
  18. 19130
  19. 15000
  20. 61000
  21. 54000
  22. 72.3
  23. 34.1
  24. 34.4
  25. 20
  26. 60
  27. 70
  28. 1800
  29. 59100
  30. 70
  31. 66890
  32. 4000
  33. 1600
  34. 2000
  35. 20
  36. 1600
  37. 14000
  38. 71.6
  39. 30
  40. 28.4

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