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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 511 · 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.Which is closest to 2706 ÷ 31? (a) 90 (b) 900 (c) 45 (d) 180
  2. 2.Round 14.53 to one decimal place. =
  3. 3.Which is closest to 897 × 48? (Round each number first.) (a) 450000 (b) 45000 (c) 4500 (d) 90000
  4. 4.Which is closest to 2004 ÷ 39? (a) 500 (b) 100 (c) 25 (d) 50
  5. 5.Which is closest to 796 × 68? (Round each number first.) (a) 560000 (b) 56000 (c) 112000 (d) 5600
  6. 6.Round 36.48 to one decimal place. =
  7. 7.Which is closest to 801 × 61? (Round each number first.) (a) 96000 (b) 480000 (c) 48000 (d) 4800
  8. 8.Which is closest to 497 + 304 + 297? (a) 1300 (b) 1000 (c) 1200 (d) 1100
  9. 9.Which is closest to 297 × 18? (Round each number first.) (a) 60000 (b) 12000 (c) 6000 (d) 600
  10. 10.Round 93694 to the nearest ten.
  11. 11.Which is closest to 297 + 396 + 196? (a) 1100 (b) 1000 (c) 900 (d) 800
  12. 12.Which is closest to 396 × 61? (Round each number first.) (a) 48000 (b) 24000 (c) 240000 (d) 2400
  13. 13.Round 6603 to the nearest hundred.
  14. 14.Round 30.09 to one decimal place. =
  15. 15.Which is closest to 204 × 38? (Round each number first.) (a) 800 (b) 16000 (c) 8000 (d) 80000
  16. 16.Which is closest to 95 + 903 + 199? (a) 1100 (b) 1400 (c) 1200 (d) 1300
  17. 17.Round 93862 to the nearest thousand.
  18. 18.Which is closest to 605 + 496 + 197? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  19. 19.Which is closest to 896 × 62? (Round each number first.) (a) 5400 (b) 54000 (c) 108000 (d) 540000
  20. 20.Which is closest to 2109 ÷ 29? (a) 140 (b) 70 (c) 35 (d) 700
  21. 21.Which is closest to 301 × 69? (Round each number first.) (a) 21000 (b) 42000 (c) 210000 (d) 2100
  22. 22.Round 7573 to the nearest hundred.
  23. 23.Which is closest to 201 × 52? (Round each number first.) (a) 100000 (b) 1000 (c) 20000 (d) 10000
  24. 24.Which is closest to 597 ÷ 29? (a) 40 (b) 200 (c) 10 (d) 20
  25. 25.Which is closest to 197 × 80? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
  26. 26.Round 38.13 to one decimal place. =
  27. 27.Round 68482 to the nearest thousand.
  28. 28.Which is closest to 301 + 301 + 897? (a) 1700 (b) 1400 (c) 1600 (d) 1500
  29. 29.Which is closest to 1494 ÷ 31? (a) 100 (b) 25 (c) 500 (d) 50
  30. 30.Which is closest to 595 ÷ 21? (a) 60 (b) 300 (c) 15 (d) 30
  31. 31.Which is closest to 2004 ÷ 51? (a) 400 (b) 80 (c) 20 (d) 40
  32. 32.Round 64.53 to one decimal place. =
  33. 33.Round 80.47 to one decimal place. =
  34. 34.Which is closest to 405 + 295 + 805? (a) 1500 (b) 1600 (c) 1400 (d) 1700
  35. 35.Round 99.94 to one decimal place. =
  36. 36.Which is closest to 703 × 38? (Round each number first.) (a) 28000 (b) 280000 (c) 2800 (d) 56000
  37. 37.Which is closest to 597 + 95 + 504? (a) 1200 (b) 1400 (c) 1100 (d) 1300
  38. 38.Round 67.06 to one decimal place. =
  39. 39.Which is closest to 896 × 19? (Round each number first.) (a) 18000 (b) 180000 (c) 1800 (d) 36000
  40. 40.Round 13.09 to one decimal place. =

Answer key

  1. 90
  2. 14.5
  3. 45000
  4. 50
  5. 56000
  6. 36.5
  7. 48000
  8. 1100
  9. 6000
  10. 93690
  11. 900
  12. 24000
  13. 6600
  14. 30.1
  15. 8000
  16. 1200
  17. 94000
  18. 1300
  19. 54000
  20. 70
  21. 21000
  22. 7600
  23. 10000
  24. 20
  25. 16000
  26. 38.1
  27. 68000
  28. 1500
  29. 50
  30. 30
  31. 40
  32. 64.5
  33. 80.5
  34. 1500
  35. 99.9
  36. 28000
  37. 1200
  38. 67.1
  39. 18000
  40. 13.1

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