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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 962 · 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 4501 ÷ 51? (a) 45 (b) 90 (c) 180 (d) 900
  2. 2.Which is closest to 99 + 704 + 203? (a) 1000 (b) 1100 (c) 1200 (d) 900
  3. 3.Round 61.73 to one decimal place. =
  4. 4.Which is closest to 499 × 62? (Round each number first.) (a) 60000 (b) 30000 (c) 300000 (d) 3000
  5. 5.Round 64453 to the nearest ten.
  6. 6.Round 24373 to the nearest hundred.
  7. 7.Round 97.44 to one decimal place. =
  8. 8.Which is closest to 695 + 502 + 500? (a) 1900 (b) 1700 (c) 1600 (d) 1800
  9. 9.Which is closest to 200 + 297 + 702? (a) 1400 (b) 1200 (c) 1300 (d) 1100
  10. 10.Round 86501 to the nearest thousand.
  11. 11.Which is closest to 3494 ÷ 49? (a) 35 (b) 700 (c) 70 (d) 140
  12. 12.Round 26.74 to one decimal place. =
  13. 13.Which is closest to 705 + 895 + 697? (a) 2200 (b) 2300 (c) 2500 (d) 2400
  14. 14.Which is closest to 496 × 29? (Round each number first.) (a) 150000 (b) 30000 (c) 1500 (d) 15000
  15. 15.Round 72.13 to one decimal place. =
  16. 16.Round 53732 to the nearest ten.
  17. 17.Which is closest to 897 ÷ 31? (a) 60 (b) 30 (c) 300 (d) 15
  18. 18.Round 12098 to the nearest ten.
  19. 19.Round 27697 to the nearest hundred.
  20. 20.Which is closest to 2396 ÷ 41? (a) 30 (b) 120 (c) 600 (d) 60
  21. 21.Which is closest to 196 × 20? (Round each number first.) (a) 8000 (b) 4000 (c) 40000 (d) 400
  22. 22.Which is closest to 1797 ÷ 31? (a) 120 (b) 30 (c) 600 (d) 60
  23. 23.Round 97.59 to one decimal place. =
  24. 24.Round 76040 to the nearest thousand.
  25. 25.Which is closest to 304 + 403 + 395? (a) 1100 (b) 1200 (c) 1300 (d) 1000
  26. 26.Which is closest to 298 × 20? (Round each number first.) (a) 12000 (b) 60000 (c) 600 (d) 6000
  27. 27.Round 73928 to the nearest ten.
  28. 28.Round 32.36 to one decimal place. =
  29. 29.Round 71.67 to one decimal place. =
  30. 30.Which is closest to 400 + 596 + 100? (a) 1000 (b) 1300 (c) 1100 (d) 1200
  31. 31.Which is closest to 404 × 49? (Round each number first.) (a) 20000 (b) 200000 (c) 40000 (d) 2000
  32. 32.Round 80.34 to one decimal place. =
  33. 33.Which is closest to 800 × 61? (Round each number first.) (a) 48000 (b) 480000 (c) 4800 (d) 96000
  34. 34.Which is closest to 1803 ÷ 21? (a) 900 (b) 90 (c) 180 (d) 45
  35. 35.Round 50704 to the nearest hundred.
  36. 36.Round 60138 to the nearest ten.
  37. 37.Round 87.87 to one decimal place. =
  38. 38.Which is closest to 2798 ÷ 39? (a) 700 (b) 35 (c) 140 (d) 70
  39. 39.Round 25.11 to one decimal place. =
  40. 40.Which is closest to 203 + 804 + 495? (a) 1700 (b) 1500 (c) 1400 (d) 1600

Answer key

  1. 90
  2. 1000
  3. 61.7
  4. 30000
  5. 64450
  6. 24400
  7. 97.4
  8. 1700
  9. 1200
  10. 87000
  11. 70
  12. 26.7
  13. 2300
  14. 15000
  15. 72.1
  16. 53730
  17. 30
  18. 12100
  19. 27700
  20. 60
  21. 4000
  22. 60
  23. 97.6
  24. 76000
  25. 1100
  26. 6000
  27. 73930
  28. 32.4
  29. 71.7
  30. 1100
  31. 20000
  32. 80.3
  33. 48000
  34. 90
  35. 50700
  36. 60140
  37. 87.9
  38. 70
  39. 25.1
  40. 1500

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