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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 588 · 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 19.23 to one decimal place. =
  2. 2.Round 23673 to the nearest thousand.
  3. 3.Round 72651 to the nearest ten.
  4. 4.Which is closest to 399 × 39? (Round each number first.) (a) 160000 (b) 16000 (c) 1600 (d) 32000
  5. 5.Which is closest to 303 + 895 + 100? (a) 1300 (b) 1200 (c) 1500 (d) 1400
  6. 6.Round 49.28 to one decimal place. =
  7. 7.Which is closest to 398 + 596 + 505? (a) 1600 (b) 1400 (c) 1500 (d) 1700
  8. 8.Which is closest to 896 × 52? (Round each number first.) (a) 4500 (b) 450000 (c) 90000 (d) 45000
  9. 9.Which is closest to 199 + 405 + 403? (a) 1200 (b) 1000 (c) 900 (d) 1100
  10. 10.Which is closest to 905 + 201 + 595? (a) 1800 (b) 1600 (c) 1900 (d) 1700
  11. 11.Which is closest to 496 × 32? (Round each number first.) (a) 15000 (b) 30000 (c) 1500 (d) 150000
  12. 12.Which is closest to 593 ÷ 19? (a) 300 (b) 15 (c) 30 (d) 60
  13. 13.Round 88.08 to one decimal place. =
  14. 14.Which is closest to 697 × 28? (Round each number first.) (a) 210000 (b) 2100 (c) 42000 (d) 21000
  15. 15.Round 22488 to the nearest thousand.
  16. 16.Which is closest to 402 × 52? (Round each number first.) (a) 40000 (b) 200000 (c) 2000 (d) 20000
  17. 17.Which is closest to 902 + 204 + 95? (a) 1300 (b) 1400 (c) 1100 (d) 1200
  18. 18.Round 69.73 to one decimal place. =
  19. 19.Round 39.94 to one decimal place. =
  20. 20.Which is closest to 297 + 797 + 804? (a) 1800 (b) 2100 (c) 2000 (d) 1900
  21. 21.Round 67112 to the nearest thousand.
  22. 22.Round 81814 to the nearest thousand.
  23. 23.Which is closest to 195 + 203 + 802? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  24. 24.Round 25868 to the nearest hundred.
  25. 25.Round 38551 to the nearest thousand.
  26. 26.Which is closest to 98 + 201 + 402? (a) 900 (b) 800 (c) 700 (d) 600
  27. 27.Round 45.72 to one decimal place. =
  28. 28.Round 78486 to the nearest hundred.
  29. 29.Which is closest to 202 + 198 + 103? (a) 700 (b) 500 (c) 400 (d) 600
  30. 30.Which is closest to 304 × 18? (Round each number first.) (a) 12000 (b) 600 (c) 6000 (d) 60000
  31. 31.Which is closest to 698 × 78? (Round each number first.) (a) 5600 (b) 112000 (c) 560000 (d) 56000
  32. 32.Which is closest to 797 + 404 + 701? (a) 2100 (b) 2000 (c) 1800 (d) 1900
  33. 33.Which is closest to 497 × 42? (Round each number first.) (a) 40000 (b) 2000 (c) 200000 (d) 20000
  34. 34.Round 19.84 to one decimal place. =
  35. 35.Round 52.64 to one decimal place. =
  36. 36.Round 62.87 to one decimal place. =
  37. 37.Round 46.58 to one decimal place. =
  38. 38.Which is closest to 196 + 198 + 598? (a) 1000 (b) 1200 (c) 1100 (d) 900
  39. 39.Round 33.92 to one decimal place. =
  40. 40.Which is closest to 803 + 502 + 605? (a) 2100 (b) 1900 (c) 2000 (d) 1800

Answer key

  1. 19.2
  2. 24000
  3. 72650
  4. 16000
  5. 1300
  6. 49.3
  7. 1500
  8. 45000
  9. 1000
  10. 1700
  11. 15000
  12. 30
  13. 88.1
  14. 21000
  15. 22000
  16. 20000
  17. 1200
  18. 69.7
  19. 39.9
  20. 1900
  21. 67000
  22. 82000
  23. 1200
  24. 25900
  25. 39000
  26. 700
  27. 45.7
  28. 78500
  29. 500
  30. 6000
  31. 56000
  32. 1900
  33. 20000
  34. 19.8
  35. 52.6
  36. 62.9
  37. 46.6
  38. 1000
  39. 33.9
  40. 1900

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