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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 366 · 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 91.81 to one decimal place. =
  2. 2.Which is closest to 903 × 31? (Round each number first.) (a) 54000 (b) 2700 (c) 270000 (d) 27000
  3. 3.Which is closest to 796 × 31? (Round each number first.) (a) 24000 (b) 2400 (c) 48000 (d) 240000
  4. 4.Which is closest to 201 × 30? (Round each number first.) (a) 12000 (b) 600 (c) 6000 (d) 60000
  5. 5.Round 44088 to the nearest hundred.
  6. 6.Round 80.59 to one decimal place. =
  7. 7.Round 48326 to the nearest thousand.
  8. 8.Which is closest to 2702 ÷ 29? (a) 90 (b) 45 (c) 180 (d) 900
  9. 9.Which is closest to 705 + 801 + 900? (a) 2500 (b) 2300 (c) 2400 (d) 2600
  10. 10.Round 94.92 to one decimal place. =
  11. 11.Which is closest to 800 + 604 + 795? (a) 2400 (b) 2200 (c) 2100 (d) 2300
  12. 12.Which is closest to 801 × 18? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
  13. 13.Which is closest to 900 × 28? (Round each number first.) (a) 27000 (b) 2700 (c) 54000 (d) 270000
  14. 14.Round 68281 to the nearest thousand.
  15. 15.Which is closest to 2498 ÷ 51? (a) 25 (b) 50 (c) 100 (d) 500
  16. 16.Round 50.27 to one decimal place. =
  17. 17.Round 26.74 to one decimal place. =
  18. 18.Which is closest to 298 + 399 + 504? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  19. 19.Which is closest to 2706 ÷ 31? (a) 45 (b) 180 (c) 90 (d) 900
  20. 20.Round 83239 to the nearest hundred.
  21. 21.Which is closest to 302 × 58? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  22. 22.Which is closest to 296 × 62? (Round each number first.) (a) 18000 (b) 36000 (c) 1800 (d) 180000
  23. 23.Which is closest to 498 × 30? (Round each number first.) (a) 1500 (b) 30000 (c) 15000 (d) 150000
  24. 24.Round 27.22 to one decimal place. =
  25. 25.Round 15.21 to one decimal place. =
  26. 26.Round 60479 to the nearest thousand.
  27. 27.Which is closest to 2009 ÷ 49? (a) 20 (b) 80 (c) 40 (d) 400
  28. 28.Which is closest to 298 × 61? (Round each number first.) (a) 18000 (b) 36000 (c) 180000 (d) 1800
  29. 29.Round 95.88 to one decimal place. =
  30. 30.Round 83216 to the nearest hundred.
  31. 31.Which is closest to 298 × 51? (Round each number first.) (a) 1500 (b) 30000 (c) 150000 (d) 15000
  32. 32.Which is closest to 496 × 22? (Round each number first.) (a) 20000 (b) 100000 (c) 10000 (d) 1000
  33. 33.Which is closest to 695 + 496 + 404? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  34. 34.Which is closest to 497 + 698 + 396? (a) 1700 (b) 1800 (c) 1500 (d) 1600
  35. 35.Which is closest to 300 × 28? (Round each number first.) (a) 9000 (b) 900 (c) 18000 (d) 90000
  36. 36.Round 17044 to the nearest thousand.
  37. 37.Which is closest to 503 + 405 + 598? (a) 1400 (b) 1600 (c) 1500 (d) 1700
  38. 38.Which is closest to 501 × 49? (Round each number first.) (a) 250000 (b) 2500 (c) 25000 (d) 50000
  39. 39.Which is closest to 904 × 48? (Round each number first.) (a) 450000 (b) 4500 (c) 45000 (d) 90000
  40. 40.Round 48.09 to one decimal place. =

Answer key

  1. 91.8
  2. 27000
  3. 24000
  4. 6000
  5. 44100
  6. 80.6
  7. 48000
  8. 90
  9. 2400
  10. 94.9
  11. 2200
  12. 16000
  13. 27000
  14. 68000
  15. 50
  16. 50.3
  17. 26.7
  18. 1200
  19. 90
  20. 83200
  21. 18000
  22. 18000
  23. 15000
  24. 27.2
  25. 15.2
  26. 60000
  27. 40
  28. 18000
  29. 95.9
  30. 83200
  31. 15000
  32. 10000
  33. 1600
  34. 1600
  35. 9000
  36. 17000
  37. 1500
  38. 25000
  39. 45000
  40. 48.1

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