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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 769 · 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 63.11 to one decimal place. =
  2. 2.Round 8507 to the nearest hundred.
  3. 3.Which is closest to 801 × 21? (Round each number first.) (a) 32000 (b) 16000 (c) 1600 (d) 160000
  4. 4.Which is closest to 204 × 79? (Round each number first.) (a) 160000 (b) 1600 (c) 32000 (d) 16000
  5. 5.Which is closest to 499 + 202 + 300? (a) 1000 (b) 1200 (c) 1100 (d) 900
  6. 6.Round 31598 to the nearest hundred.
  7. 7.Which is closest to 404 × 59? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  8. 8.Round 37.86 to one decimal place. =
  9. 9.Round 72783 to the nearest thousand.
  10. 10.Round 83.79 to one decimal place. =
  11. 11.Which is closest to 905 + 896 + 101? (a) 1900 (b) 2000 (c) 1800 (d) 2100
  12. 12.Which is closest to 597 + 796 + 499? (a) 1800 (b) 1900 (c) 2100 (d) 2000
  13. 13.Round 32633 to the nearest hundred.
  14. 14.Which is closest to 807 ÷ 21? (a) 80 (b) 400 (c) 20 (d) 40
  15. 15.Which is closest to 104 + 605 + 895? (a) 1500 (b) 1800 (c) 1600 (d) 1700
  16. 16.Round 81.73 to one decimal place. =
  17. 17.Which is closest to 1406 ÷ 19? (a) 70 (b) 35 (c) 700 (d) 140
  18. 18.Which is closest to 899 × 39? (Round each number first.) (a) 36000 (b) 3600 (c) 360000 (d) 72000
  19. 19.Which is closest to 599 + 604 + 297? (a) 1700 (b) 1600 (c) 1400 (d) 1500
  20. 20.Which is closest to 99 + 298 + 202? (a) 500 (b) 700 (c) 600 (d) 800
  21. 21.Which is closest to 397 + 798 + 605? (a) 1800 (b) 2000 (c) 1700 (d) 1900
  22. 22.Round 3258 to the nearest hundred.
  23. 23.Which is closest to 798 × 70? (Round each number first.) (a) 112000 (b) 5600 (c) 56000 (d) 560000
  24. 24.Round 23.86 to one decimal place. =
  25. 25.Which is closest to 895 + 798 + 802? (a) 2400 (b) 2600 (c) 2500 (d) 2700
  26. 26.Round 40.26 to one decimal place. =
  27. 27.Round 81.06 to one decimal place. =
  28. 28.Which is closest to 701 × 71? (Round each number first.) (a) 49000 (b) 490000 (c) 4900 (d) 98000
  29. 29.Which is closest to 2397 ÷ 31? (a) 800 (b) 40 (c) 160 (d) 80
  30. 30.Round 97.09 to one decimal place. =
  31. 31.Round 16767 to the nearest ten.
  32. 32.Round 36.31 to one decimal place. =
  33. 33.Round 85.44 to one decimal place. =
  34. 34.Which is closest to 797 × 31? (Round each number first.) (a) 24000 (b) 48000 (c) 2400 (d) 240000
  35. 35.Round 36864 to the nearest hundred.
  36. 36.Which is closest to 201 × 18? (Round each number first.) (a) 8000 (b) 40000 (c) 4000 (d) 400
  37. 37.Which is closest to 409 ÷ 19? (a) 10 (b) 40 (c) 20 (d) 200
  38. 38.Which is closest to 401 + 597 + 204? (a) 1400 (b) 1100 (c) 1200 (d) 1300
  39. 39.Round 64.86 to one decimal place. =
  40. 40.Round 67.48 to one decimal place. =

Answer key

  1. 63.1
  2. 8500
  3. 16000
  4. 16000
  5. 1000
  6. 31600
  7. 24000
  8. 37.9
  9. 73000
  10. 83.8
  11. 1900
  12. 1900
  13. 32600
  14. 40
  15. 1600
  16. 81.7
  17. 70
  18. 36000
  19. 1500
  20. 600
  21. 1800
  22. 3300
  23. 56000
  24. 23.9
  25. 2500
  26. 40.3
  27. 81.1
  28. 49000
  29. 80
  30. 97.1
  31. 16770
  32. 36.3
  33. 85.4
  34. 24000
  35. 36900
  36. 4000
  37. 20
  38. 1200
  39. 64.9
  40. 67.5

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