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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 950 · 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 75.06 to one decimal place. =
  2. 2.Round 23913 to the nearest ten.
  3. 3.Round 27962 to the nearest thousand.
  4. 4.Which is closest to 3205 ÷ 41? (a) 40 (b) 160 (c) 80 (d) 800
  5. 5.Which is closest to 802 + 395 + 503? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  6. 6.Which is closest to 597 × 72? (Round each number first.) (a) 42000 (b) 420000 (c) 4200 (d) 84000
  7. 7.Which is closest to 901 + 300 + 703? (a) 2000 (b) 1900 (c) 1800 (d) 2100
  8. 8.Which is closest to 196 + 698 + 101? (a) 900 (b) 1200 (c) 1000 (d) 1100
  9. 9.Round 74777 to the nearest thousand.
  10. 10.Which is closest to 497 × 81? (Round each number first.) (a) 80000 (b) 4000 (c) 400000 (d) 40000
  11. 11.Which is closest to 497 + 903 + 397? (a) 1700 (b) 1800 (c) 2000 (d) 1900
  12. 12.Which is closest to 804 × 50? (Round each number first.) (a) 40000 (b) 4000 (c) 80000 (d) 400000
  13. 13.Which is closest to 201 + 304 + 402? (a) 800 (b) 1100 (c) 900 (d) 1000
  14. 14.Round 11.07 to one decimal place. =
  15. 15.Which is closest to 301 + 202 + 705? (a) 1300 (b) 1400 (c) 1200 (d) 1100
  16. 16.Which is closest to 1395 ÷ 21? (a) 700 (b) 140 (c) 35 (d) 70
  17. 17.Round 33819 to the nearest thousand.
  18. 18.Which is closest to 1598 ÷ 21? (a) 800 (b) 80 (c) 160 (d) 40
  19. 19.Round 10.29 to one decimal place. =
  20. 20.Which is closest to 500 × 61? (Round each number first.) (a) 300000 (b) 30000 (c) 60000 (d) 3000
  21. 21.Which is closest to 2994 ÷ 49? (a) 600 (b) 120 (c) 30 (d) 60
  22. 22.Round 60.33 to one decimal place. =
  23. 23.Which is closest to 796 × 80? (Round each number first.) (a) 128000 (b) 640000 (c) 6400 (d) 64000
  24. 24.Which is closest to 504 + 195 + 299? (a) 1000 (b) 900 (c) 1100 (d) 1200
  25. 25.Round 40016 to the nearest ten.
  26. 26.Which is closest to 401 + 97 + 396? (a) 1100 (b) 900 (c) 1000 (d) 800
  27. 27.Round 22.28 to one decimal place. =
  28. 28.Round 78.92 to one decimal place. =
  29. 29.Which is closest to 102 + 296 + 804? (a) 1100 (b) 1400 (c) 1200 (d) 1300
  30. 30.Round 13197 to the nearest ten.
  31. 31.Which is closest to 3593 ÷ 41? (a) 900 (b) 45 (c) 180 (d) 90
  32. 32.Which is closest to 599 + 495 + 298? (a) 1600 (b) 1500 (c) 1400 (d) 1300
  33. 33.Which is closest to 697 × 89? (Round each number first.) (a) 6300 (b) 126000 (c) 63000 (d) 630000
  34. 34.Which is closest to 2992 ÷ 49? (a) 30 (b) 600 (c) 120 (d) 60
  35. 35.Round 18.91 to one decimal place. =
  36. 36.Round 59602 to the nearest hundred.
  37. 37.Round 69.44 to one decimal place. =
  38. 38.Which is closest to 699 × 62? (Round each number first.) (a) 42000 (b) 420000 (c) 84000 (d) 4200
  39. 39.Round 17.24 to one decimal place. =
  40. 40.Which is closest to 296 × 82? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000

Answer key

  1. 75.1
  2. 23910
  3. 28000
  4. 80
  5. 1700
  6. 42000
  7. 1900
  8. 1000
  9. 75000
  10. 40000
  11. 1800
  12. 40000
  13. 900
  14. 11.1
  15. 1200
  16. 70
  17. 34000
  18. 80
  19. 10.3
  20. 30000
  21. 60
  22. 60.3
  23. 64000
  24. 1000
  25. 40020
  26. 900
  27. 22.3
  28. 78.9
  29. 1200
  30. 13200
  31. 90
  32. 1400
  33. 63000
  34. 60
  35. 18.9
  36. 59600
  37. 69.4
  38. 42000
  39. 17.2
  40. 24000

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