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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 93 · 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 51698 to the nearest hundred.
  2. 2.Round 27.82 to one decimal place. =
  3. 3.Round 68.08 to one decimal place. =
  4. 4.Which is closest to 1606 ÷ 39? (a) 400 (b) 80 (c) 20 (d) 40
  5. 5.Round 1568 to the nearest hundred.
  6. 6.Which is closest to 100 + 301 + 199? (a) 500 (b) 800 (c) 600 (d) 700
  7. 7.Which is closest to 799 + 497 + 103? (a) 1400 (b) 1500 (c) 1300 (d) 1600
  8. 8.Which is closest to 496 × 68? (Round each number first.) (a) 3500 (b) 70000 (c) 350000 (d) 35000
  9. 9.Which is closest to 801 + 105 + 496? (a) 1500 (b) 1300 (c) 1600 (d) 1400
  10. 10.Which is closest to 896 + 303 + 605? (a) 1800 (b) 1900 (c) 2000 (d) 1700
  11. 11.Which is closest to 2996 ÷ 49? (a) 600 (b) 120 (c) 60 (d) 30
  12. 12.Which is closest to 199 × 41? (Round each number first.) (a) 800 (b) 16000 (c) 80000 (d) 8000
  13. 13.Which is closest to 901 + 301 + 95? (a) 1500 (b) 1400 (c) 1200 (d) 1300
  14. 14.Which is closest to 804 × 49? (Round each number first.) (a) 4000 (b) 40000 (c) 400000 (d) 80000
  15. 15.Which is closest to 396 + 105 + 500? (a) 1200 (b) 1100 (c) 1000 (d) 900
  16. 16.Which is closest to 1205 ÷ 31? (a) 40 (b) 80 (c) 20 (d) 400
  17. 17.Round 89816 to the nearest ten.
  18. 18.Round 92.57 to one decimal place. =
  19. 19.Which is closest to 1209 ÷ 41? (a) 300 (b) 15 (c) 30 (d) 60
  20. 20.Which is closest to 3992 ÷ 49? (a) 40 (b) 80 (c) 160 (d) 800
  21. 21.Round 68065 to the nearest thousand.
  22. 22.Which is closest to 699 × 70? (Round each number first.) (a) 4900 (b) 98000 (c) 490000 (d) 49000
  23. 23.Which is closest to 195 + 296 + 201? (a) 900 (b) 700 (c) 800 (d) 600
  24. 24.Which is closest to 696 × 50? (Round each number first.) (a) 350000 (b) 35000 (c) 3500 (d) 70000
  25. 25.Which is closest to 895 + 599 + 801? (a) 2200 (b) 2500 (c) 2300 (d) 2400
  26. 26.Round 31.89 to one decimal place. =
  27. 27.Which is closest to 295 + 597 + 903? (a) 1700 (b) 2000 (c) 1800 (d) 1900
  28. 28.Round 35.19 to one decimal place. =
  29. 29.Which is closest to 798 + 97 + 499? (a) 1500 (b) 1400 (c) 1600 (d) 1300
  30. 30.Which is closest to 497 + 599 + 595? (a) 1900 (b) 1700 (c) 1800 (d) 1600
  31. 31.Round 18.72 to one decimal place. =
  32. 32.Which is closest to 699 + 798 + 696? (a) 2100 (b) 2300 (c) 2200 (d) 2400
  33. 33.Which is closest to 2406 ÷ 31? (a) 800 (b) 80 (c) 160 (d) 40
  34. 34.Which is closest to 403 × 31? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  35. 35.Which is closest to 604 × 82? (Round each number first.) (a) 480000 (b) 4800 (c) 48000 (d) 96000
  36. 36.Round 74.46 to one decimal place. =
  37. 37.Which is closest to 703 + 304 + 203? (a) 1100 (b) 1200 (c) 1300 (d) 1400
  38. 38.Which is closest to 299 × 88? (Round each number first.) (a) 54000 (b) 2700 (c) 27000 (d) 270000
  39. 39.Which is closest to 892 ÷ 29? (a) 300 (b) 15 (c) 30 (d) 60
  40. 40.Round 91258 to the nearest ten.

Answer key

  1. 51700
  2. 27.8
  3. 68.1
  4. 40
  5. 1600
  6. 600
  7. 1400
  8. 35000
  9. 1400
  10. 1800
  11. 60
  12. 8000
  13. 1300
  14. 40000
  15. 1000
  16. 40
  17. 89820
  18. 92.6
  19. 30
  20. 80
  21. 68000
  22. 49000
  23. 700
  24. 35000
  25. 2300
  26. 31.9
  27. 1800
  28. 35.2
  29. 1400
  30. 1700
  31. 18.7
  32. 2200
  33. 80
  34. 12000
  35. 48000
  36. 74.5
  37. 1200
  38. 27000
  39. 30
  40. 91260

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