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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 656 · 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 1793 ÷ 19? (a) 90 (b) 180 (c) 45 (d) 900
  2. 2.Which is closest to 304 + 699 + 599? (a) 1500 (b) 1800 (c) 1700 (d) 1600
  3. 3.Round 39684 to the nearest thousand.
  4. 4.Which is closest to 204 × 91? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  5. 5.Round 99554 to the nearest thousand.
  6. 6.Which is closest to 404 × 68? (Round each number first.) (a) 56000 (b) 2800 (c) 280000 (d) 28000
  7. 7.Which is closest to 2400 ÷ 31? (a) 800 (b) 80 (c) 40 (d) 160
  8. 8.Which is closest to 398 + 200 + 899? (a) 1700 (b) 1600 (c) 1500 (d) 1400
  9. 9.Round 27304 to the nearest thousand.
  10. 10.Which is closest to 500 + 497 + 603? (a) 1700 (b) 1800 (c) 1500 (d) 1600
  11. 11.Which is closest to 1195 ÷ 29? (a) 40 (b) 80 (c) 20 (d) 400
  12. 12.Which is closest to 704 + 196 + 696? (a) 1600 (b) 1800 (c) 1700 (d) 1500
  13. 13.Round 64759 to the nearest hundred.
  14. 14.Which is closest to 1798 ÷ 21? (a) 180 (b) 900 (c) 90 (d) 45
  15. 15.Which is closest to 2694 ÷ 31? (a) 45 (b) 90 (c) 180 (d) 900
  16. 16.Which is closest to 1607 ÷ 41? (a) 80 (b) 40 (c) 400 (d) 20
  17. 17.Which is closest to 397 + 600 + 404? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  18. 18.Round 85911 to the nearest thousand.
  19. 19.Round 56425 to the nearest hundred.
  20. 20.Which is closest to 1004 ÷ 49? (a) 200 (b) 10 (c) 40 (d) 20
  21. 21.Which is closest to 105 + 497 + 197? (a) 700 (b) 800 (c) 1000 (d) 900
  22. 22.Which is closest to 495 + 102 + 705? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  23. 23.Which is closest to 796 + 895 + 399? (a) 2300 (b) 2000 (c) 2100 (d) 2200
  24. 24.Round 13.93 to one decimal place. =
  25. 25.Which is closest to 1207 ÷ 41? (a) 300 (b) 30 (c) 60 (d) 15
  26. 26.Round 20226 to the nearest ten.
  27. 27.Round 17.17 to one decimal place. =
  28. 28.Round 63.22 to one decimal place. =
  29. 29.Which is closest to 401 × 90? (Round each number first.) (a) 3600 (b) 72000 (c) 360000 (d) 36000
  30. 30.Which is closest to 897 × 82? (Round each number first.) (a) 144000 (b) 72000 (c) 720000 (d) 7200
  31. 31.Which is closest to 595 + 801 + 703? (a) 2200 (b) 2300 (c) 2000 (d) 2100
  32. 32.Round 7816 to the nearest thousand.
  33. 33.Which is closest to 703 × 38? (Round each number first.) (a) 56000 (b) 2800 (c) 28000 (d) 280000
  34. 34.Round 30851 to the nearest ten.
  35. 35.Round 5161 to the nearest hundred.
  36. 36.Which is closest to 797 + 705 + 301? (a) 2000 (b) 1800 (c) 1900 (d) 1700
  37. 37.Round 54.73 to one decimal place. =
  38. 38.Which is closest to 598 × 39? (Round each number first.) (a) 24000 (b) 240000 (c) 48000 (d) 2400
  39. 39.Round 64293 to the nearest thousand.
  40. 40.Which is closest to 800 × 91? (Round each number first.) (a) 144000 (b) 720000 (c) 7200 (d) 72000

Answer key

  1. 90
  2. 1600
  3. 40000
  4. 18000
  5. 100000
  6. 28000
  7. 80
  8. 1500
  9. 27000
  10. 1600
  11. 40
  12. 1600
  13. 64800
  14. 90
  15. 90
  16. 40
  17. 1400
  18. 86000
  19. 56400
  20. 20
  21. 800
  22. 1300
  23. 2100
  24. 13.9
  25. 30
  26. 20230
  27. 17.2
  28. 63.2
  29. 36000
  30. 72000
  31. 2100
  32. 8000
  33. 28000
  34. 30850
  35. 5200
  36. 1800
  37. 54.7
  38. 24000
  39. 64000
  40. 72000

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