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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 960 · 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 75.92 to one decimal place. =
  2. 2.Round 1653 to the nearest hundred.
  3. 3.Which is closest to 105 + 601 + 605? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  4. 4.Which is closest to 697 × 42? (Round each number first.) (a) 280000 (b) 2800 (c) 28000 (d) 56000
  5. 5.Which is closest to 602 + 495 + 595? (a) 1900 (b) 1600 (c) 1800 (d) 1700
  6. 6.Which is closest to 701 + 303 + 403? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  7. 7.Which is closest to 2401 ÷ 41? (a) 30 (b) 120 (c) 600 (d) 60
  8. 8.Which is closest to 793 ÷ 39? (a) 40 (b) 200 (c) 20 (d) 10
  9. 9.Which is closest to 504 × 28? (Round each number first.) (a) 30000 (b) 150000 (c) 1500 (d) 15000
  10. 10.Which is closest to 1797 ÷ 21? (a) 900 (b) 180 (c) 90 (d) 45
  11. 11.Round 20871 to the nearest ten.
  12. 12.Which is closest to 902 × 81? (Round each number first.) (a) 72000 (b) 720000 (c) 144000 (d) 7200
  13. 13.Which is closest to 700 × 49? (Round each number first.) (a) 3500 (b) 35000 (c) 70000 (d) 350000
  14. 14.Which is closest to 302 × 70? (Round each number first.) (a) 2100 (b) 42000 (c) 21000 (d) 210000
  15. 15.Which is closest to 899 × 69? (Round each number first.) (a) 63000 (b) 630000 (c) 126000 (d) 6300
  16. 16.Round 4693 to the nearest thousand.
  17. 17.Round 87.77 to one decimal place. =
  18. 18.Round 31.31 to one decimal place. =
  19. 19.Which is closest to 1607 ÷ 21? (a) 40 (b) 800 (c) 160 (d) 80
  20. 20.Which is closest to 3499 ÷ 51? (a) 700 (b) 35 (c) 140 (d) 70
  21. 21.Which is closest to 798 × 49? (Round each number first.) (a) 80000 (b) 4000 (c) 400000 (d) 40000
  22. 22.Which is closest to 803 + 703 + 197? (a) 1900 (b) 1800 (c) 1600 (d) 1700
  23. 23.Round 27569 to the nearest hundred.
  24. 24.Which is closest to 302 × 81? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  25. 25.Which is closest to 1505 ÷ 51? (a) 300 (b) 30 (c) 15 (d) 60
  26. 26.Round 12353 to the nearest ten.
  27. 27.Round 20711 to the nearest thousand.
  28. 28.Round 8710 to the nearest hundred.
  29. 29.Which is closest to 601 × 72? (Round each number first.) (a) 42000 (b) 420000 (c) 4200 (d) 84000
  30. 30.Which is closest to 898 + 602 + 102? (a) 1600 (b) 1700 (c) 1800 (d) 1500
  31. 31.Round 43254 to the nearest hundred.
  32. 32.Round 34293 to the nearest ten.
  33. 33.Which is closest to 901 × 78? (Round each number first.) (a) 720000 (b) 144000 (c) 72000 (d) 7200
  34. 34.Which is closest to 1496 ÷ 29? (a) 50 (b) 100 (c) 25 (d) 500
  35. 35.Which is closest to 2109 ÷ 31? (a) 700 (b) 35 (c) 70 (d) 140
  36. 36.Round 91.72 to one decimal place. =
  37. 37.Round 88.27 to one decimal place. =
  38. 38.Which is closest to 295 + 802 + 405? (a) 1700 (b) 1400 (c) 1600 (d) 1500
  39. 39.Round 94.93 to one decimal place. =
  40. 40.Round 60.17 to one decimal place. =

Answer key

  1. 75.9
  2. 1700
  3. 1300
  4. 28000
  5. 1700
  6. 1400
  7. 60
  8. 20
  9. 15000
  10. 90
  11. 20870
  12. 72000
  13. 35000
  14. 21000
  15. 63000
  16. 5000
  17. 87.8
  18. 31.3
  19. 80
  20. 70
  21. 40000
  22. 1700
  23. 27600
  24. 24000
  25. 30
  26. 12350
  27. 21000
  28. 8700
  29. 42000
  30. 1600
  31. 43300
  32. 34290
  33. 72000
  34. 50
  35. 70
  36. 91.7
  37. 88.3
  38. 1500
  39. 94.9
  40. 60.2

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