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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 218 · 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 14.72 to one decimal place. =
  2. 2.Round 45.24 to one decimal place. =
  3. 3.Which is closest to 199 × 91? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  4. 4.Round 96.37 to one decimal place. =
  5. 5.Round 7240 to the nearest hundred.
  6. 6.Which is closest to 1600 ÷ 21? (a) 40 (b) 80 (c) 160 (d) 800
  7. 7.Which is closest to 3605 ÷ 39? (a) 180 (b) 45 (c) 900 (d) 90
  8. 8.Which is closest to 197 + 595 + 701? (a) 1600 (b) 1400 (c) 1700 (d) 1500
  9. 9.Which is closest to 2992 ÷ 49? (a) 60 (b) 600 (c) 30 (d) 120
  10. 10.Round 62539 to the nearest ten.
  11. 11.Round 41.33 to one decimal place. =
  12. 12.Round 91628 to the nearest hundred.
  13. 13.Round 79538 to the nearest thousand.
  14. 14.Round 18819 to the nearest ten.
  15. 15.Which is closest to 803 + 498 + 596? (a) 2000 (b) 2100 (c) 1900 (d) 1800
  16. 16.Which is closest to 796 × 59? (Round each number first.) (a) 4800 (b) 48000 (c) 480000 (d) 96000
  17. 17.Round 87.69 to one decimal place. =
  18. 18.Round 10.14 to one decimal place. =
  19. 19.Round 44.42 to one decimal place. =
  20. 20.Round 19792 to the nearest thousand.
  21. 21.Round 42.66 to one decimal place. =
  22. 22.Round 11.41 to one decimal place. =
  23. 23.Round 90339 to the nearest thousand.
  24. 24.Which is closest to 600 × 69? (Round each number first.) (a) 42000 (b) 420000 (c) 84000 (d) 4200
  25. 25.Round 10681 to the nearest hundred.
  26. 26.Which is closest to 304 + 495 + 103? (a) 1100 (b) 800 (c) 1000 (d) 900
  27. 27.Which is closest to 303 × 38? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  28. 28.Which is closest to 502 + 105 + 902? (a) 1700 (b) 1600 (c) 1400 (d) 1500
  29. 29.Which is closest to 404 × 28? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  30. 30.Which is closest to 497 × 31? (Round each number first.) (a) 150000 (b) 1500 (c) 30000 (d) 15000
  31. 31.Round 12.87 to one decimal place. =
  32. 32.Which is closest to 802 + 96 + 99? (a) 900 (b) 1100 (c) 1000 (d) 1200
  33. 33.Which is closest to 1200 ÷ 29? (a) 400 (b) 20 (c) 40 (d) 80
  34. 34.Round 72.23 to one decimal place. =
  35. 35.Which is closest to 598 ÷ 21? (a) 60 (b) 300 (c) 30 (d) 15
  36. 36.Round 48211 to the nearest hundred.
  37. 37.Which is closest to 495 + 795 + 497? (a) 2000 (b) 1700 (c) 1800 (d) 1900
  38. 38.Which is closest to 3193 ÷ 39? (a) 80 (b) 160 (c) 40 (d) 800
  39. 39.Which is closest to 299 × 48? (Round each number first.) (a) 1500 (b) 150000 (c) 15000 (d) 30000
  40. 40.Which is closest to 502 × 21? (Round each number first.) (a) 20000 (b) 100000 (c) 10000 (d) 1000

Answer key

  1. 14.7
  2. 45.2
  3. 18000
  4. 96.4
  5. 7200
  6. 80
  7. 90
  8. 1500
  9. 60
  10. 62540
  11. 41.3
  12. 91600
  13. 80000
  14. 18820
  15. 1900
  16. 48000
  17. 87.7
  18. 10.1
  19. 44.4
  20. 20000
  21. 42.7
  22. 11.4
  23. 90000
  24. 42000
  25. 10700
  26. 900
  27. 12000
  28. 1500
  29. 12000
  30. 15000
  31. 12.9
  32. 1000
  33. 40
  34. 72.2
  35. 30
  36. 48200
  37. 1800
  38. 80
  39. 15000
  40. 10000

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