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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 417 · 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 42233 to the nearest ten.
  2. 2.Round 28.26 to one decimal place. =
  3. 3.Which is closest to 503 + 299 + 896? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  4. 4.Which is closest to 1195 ÷ 19? (a) 60 (b) 30 (c) 600 (d) 120
  5. 5.Which is closest to 302 + 595 + 701? (a) 1600 (b) 1500 (c) 1800 (d) 1700
  6. 6.Which is closest to 204 × 80? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
  7. 7.Which is closest to 2696 ÷ 31? (a) 180 (b) 45 (c) 90 (d) 900
  8. 8.Which is closest to 802 × 60? (Round each number first.) (a) 48000 (b) 480000 (c) 96000 (d) 4800
  9. 9.Which is closest to 3507 ÷ 49? (a) 35 (b) 700 (c) 140 (d) 70
  10. 10.Round 15.14 to one decimal place. =
  11. 11.Round 42.59 to one decimal place. =
  12. 12.Which is closest to 604 × 51? (Round each number first.) (a) 300000 (b) 30000 (c) 60000 (d) 3000
  13. 13.Round 69155 to the nearest thousand.
  14. 14.Round 52.14 to one decimal place. =
  15. 15.Which is closest to 199 × 32? (Round each number first.) (a) 12000 (b) 600 (c) 6000 (d) 60000
  16. 16.Which is closest to 697 × 38? (Round each number first.) (a) 2800 (b) 56000 (c) 28000 (d) 280000
  17. 17.Which is closest to 604 + 601 + 105? (a) 1300 (b) 1200 (c) 1500 (d) 1400
  18. 18.Round 81.91 to one decimal place. =
  19. 19.Round 51961 to the nearest ten.
  20. 20.Which is closest to 699 + 699 + 303? (a) 1900 (b) 1800 (c) 1600 (d) 1700
  21. 21.Which is closest to 195 + 605 + 502? (a) 1300 (b) 1200 (c) 1500 (d) 1400
  22. 22.Which is closest to 398 + 801 + 903? (a) 2200 (b) 2100 (c) 2300 (d) 2000
  23. 23.Which is closest to 102 + 803 + 200? (a) 1300 (b) 1000 (c) 1100 (d) 1200
  24. 24.Which is closest to 1795 ÷ 19? (a) 180 (b) 900 (c) 45 (d) 90
  25. 25.Round 64379 to the nearest hundred.
  26. 26.Round 37129 to the nearest ten.
  27. 27.Which is closest to 402 + 201 + 698? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  28. 28.Round 90.12 to one decimal place. =
  29. 29.Round 73.77 to one decimal place. =
  30. 30.Round 36.58 to one decimal place. =
  31. 31.Round 86.11 to one decimal place. =
  32. 32.Which is closest to 904 × 71? (Round each number first.) (a) 630000 (b) 6300 (c) 126000 (d) 63000
  33. 33.Which is closest to 1204 ÷ 41? (a) 30 (b) 15 (c) 300 (d) 60
  34. 34.Which is closest to 196 + 98 + 702? (a) 900 (b) 1200 (c) 1000 (d) 1100
  35. 35.Round 58.68 to one decimal place. =
  36. 36.Which is closest to 797 + 598 + 597? (a) 1900 (b) 2000 (c) 2200 (d) 2100
  37. 37.Round 44.59 to one decimal place. =
  38. 38.Which is closest to 400 + 102 + 101? (a) 600 (b) 700 (c) 500 (d) 800
  39. 39.Which is closest to 499 × 71? (Round each number first.) (a) 3500 (b) 70000 (c) 350000 (d) 35000
  40. 40.Round 30.59 to one decimal place. =

Answer key

  1. 42230
  2. 28.3
  3. 1700
  4. 60
  5. 1600
  6. 16000
  7. 90
  8. 48000
  9. 70
  10. 15.1
  11. 42.6
  12. 30000
  13. 69000
  14. 52.1
  15. 6000
  16. 28000
  17. 1300
  18. 81.9
  19. 51960
  20. 1700
  21. 1300
  22. 2100
  23. 1100
  24. 90
  25. 64400
  26. 37130
  27. 1300
  28. 90.1
  29. 73.8
  30. 36.6
  31. 86.1
  32. 63000
  33. 30
  34. 1000
  35. 58.7
  36. 2000
  37. 44.6
  38. 600
  39. 35000
  40. 30.6

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