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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 446 · 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 44.94 to one decimal place. =
  2. 2.Round 15.66 to one decimal place. =
  3. 3.Round 25360 to the nearest hundred.
  4. 4.Which is closest to 799 ÷ 21? (a) 40 (b) 20 (c) 400 (d) 80
  5. 5.Round 23.54 to one decimal place. =
  6. 6.Round 67.68 to one decimal place. =
  7. 7.Round 48.71 to one decimal place. =
  8. 8.Which is closest to 296 × 38? (Round each number first.) (a) 1200 (b) 24000 (c) 12000 (d) 120000
  9. 9.Round 20588 to the nearest thousand.
  10. 10.Round 90.42 to one decimal place. =
  11. 11.Round 93.71 to one decimal place. =
  12. 12.Which is closest to 696 + 903 + 603? (a) 2400 (b) 2100 (c) 2300 (d) 2200
  13. 13.Round 23.39 to one decimal place. =
  14. 14.Which is closest to 796 + 502 + 803? (a) 2000 (b) 2100 (c) 2200 (d) 2300
  15. 15.Round 81973 to the nearest hundred.
  16. 16.Round 49.57 to one decimal place. =
  17. 17.Which is closest to 795 + 898 + 798? (a) 2700 (b) 2500 (c) 2600 (d) 2400
  18. 18.Round 19.68 to one decimal place. =
  19. 19.Round 55.31 to one decimal place. =
  20. 20.Which is closest to 4509 ÷ 51? (a) 90 (b) 180 (c) 45 (d) 900
  21. 21.Round 86.72 to one decimal place. =
  22. 22.Round 53443 to the nearest ten.
  23. 23.Round 31.61 to one decimal place. =
  24. 24.Round 17.33 to one decimal place. =
  25. 25.Which is closest to 802 × 48? (Round each number first.) (a) 400000 (b) 80000 (c) 4000 (d) 40000
  26. 26.Which is closest to 497 × 89? (Round each number first.) (a) 4500 (b) 90000 (c) 45000 (d) 450000
  27. 27.Which is closest to 402 × 52? (Round each number first.) (a) 20000 (b) 2000 (c) 40000 (d) 200000
  28. 28.Which is closest to 397 + 199 + 201? (a) 700 (b) 900 (c) 800 (d) 1000
  29. 29.Round 63280 to the nearest hundred.
  30. 30.Which is closest to 904 × 28? (Round each number first.) (a) 54000 (b) 270000 (c) 27000 (d) 2700
  31. 31.Which is closest to 496 × 49? (Round each number first.) (a) 250000 (b) 2500 (c) 50000 (d) 25000
  32. 32.Round 67.52 to one decimal place. =
  33. 33.Which is closest to 2007 ÷ 41? (a) 100 (b) 25 (c) 500 (d) 50
  34. 34.Round 48.42 to one decimal place. =
  35. 35.Which is closest to 301 + 397 + 305? (a) 1100 (b) 900 (c) 1000 (d) 1200
  36. 36.Round 98312 to the nearest ten.
  37. 37.Which is closest to 703 × 49? (Round each number first.) (a) 3500 (b) 70000 (c) 350000 (d) 35000
  38. 38.Which is closest to 398 × 29? (Round each number first.) (a) 24000 (b) 12000 (c) 1200 (d) 120000
  39. 39.Round 89.56 to one decimal place. =
  40. 40.Which is closest to 598 × 81? (Round each number first.) (a) 4800 (b) 48000 (c) 96000 (d) 480000

Answer key

  1. 44.9
  2. 15.7
  3. 25400
  4. 40
  5. 23.5
  6. 67.7
  7. 48.7
  8. 12000
  9. 21000
  10. 90.4
  11. 93.7
  12. 2200
  13. 23.4
  14. 2100
  15. 82000
  16. 49.6
  17. 2500
  18. 19.7
  19. 55.3
  20. 90
  21. 86.7
  22. 53440
  23. 31.6
  24. 17.3
  25. 40000
  26. 45000
  27. 20000
  28. 800
  29. 63300
  30. 27000
  31. 25000
  32. 67.5
  33. 50
  34. 48.4
  35. 1000
  36. 98310
  37. 35000
  38. 12000
  39. 89.6
  40. 48000

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