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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 920 · 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 396 + 398 + 701? (a) 1600 (b) 1700 (c) 1400 (d) 1500
  2. 2.Which is closest to 296 × 19? (Round each number first.) (a) 12000 (b) 60000 (c) 6000 (d) 600
  3. 3.Which is closest to 295 + 600 + 395? (a) 1400 (b) 1300 (c) 1200 (d) 1500
  4. 4.Which is closest to 994 ÷ 19? (a) 50 (b) 100 (c) 25 (d) 500
  5. 5.Which is closest to 196 + 395 + 896? (a) 1600 (b) 1400 (c) 1500 (d) 1700
  6. 6.Which is closest to 499 + 402 + 595? (a) 1600 (b) 1500 (c) 1700 (d) 1400
  7. 7.Which is closest to 403 × 72? (Round each number first.) (a) 2800 (b) 56000 (c) 28000 (d) 280000
  8. 8.Which is closest to 4001 ÷ 51? (a) 80 (b) 160 (c) 40 (d) 800
  9. 9.Round 77359 to the nearest ten.
  10. 10.Which is closest to 204 × 71? (Round each number first.) (a) 140000 (b) 28000 (c) 14000 (d) 1400
  11. 11.Which is closest to 701 × 39? (Round each number first.) (a) 56000 (b) 2800 (c) 28000 (d) 280000
  12. 12.Which is closest to 603 + 803 + 703? (a) 2200 (b) 2100 (c) 2000 (d) 2300
  13. 13.Which is closest to 297 × 88? (Round each number first.) (a) 270000 (b) 54000 (c) 27000 (d) 2700
  14. 14.Which is closest to 497 × 30? (Round each number first.) (a) 30000 (b) 1500 (c) 15000 (d) 150000
  15. 15.Which is closest to 502 × 39? (Round each number first.) (a) 40000 (b) 200000 (c) 2000 (d) 20000
  16. 16.Round 25815 to the nearest hundred.
  17. 17.Round 77852 to the nearest hundred.
  18. 18.Which is closest to 802 + 700 + 905? (a) 2600 (b) 2300 (c) 2400 (d) 2500
  19. 19.Which is closest to 796 × 82? (Round each number first.) (a) 128000 (b) 64000 (c) 6400 (d) 640000
  20. 20.Which is closest to 599 × 58? (Round each number first.) (a) 36000 (b) 72000 (c) 360000 (d) 3600
  21. 21.Which is closest to 504 + 704 + 704? (a) 2100 (b) 1900 (c) 2000 (d) 1800
  22. 22.Round 43.71 to one decimal place. =
  23. 23.Round 13.78 to one decimal place. =
  24. 24.Round 66.88 to one decimal place. =
  25. 25.Which is closest to 304 × 50? (Round each number first.) (a) 30000 (b) 150000 (c) 1500 (d) 15000
  26. 26.Round 8608 to the nearest ten.
  27. 27.Round 20.81 to one decimal place. =
  28. 28.Which is closest to 596 + 803 + 498? (a) 1900 (b) 1800 (c) 2100 (d) 2000
  29. 29.Round 90516 to the nearest ten.
  30. 30.Which is closest to 4499 ÷ 49? (a) 900 (b) 180 (c) 90 (d) 45
  31. 31.Round 20.43 to one decimal place. =
  32. 32.Which is closest to 704 × 69? (Round each number first.) (a) 98000 (b) 4900 (c) 49000 (d) 490000
  33. 33.Round 69.66 to one decimal place. =
  34. 34.Which is closest to 1594 ÷ 19? (a) 160 (b) 800 (c) 80 (d) 40
  35. 35.Round 25.49 to one decimal place. =
  36. 36.Which is closest to 801 × 52? (Round each number first.) (a) 80000 (b) 400000 (c) 40000 (d) 4000
  37. 37.Round 27.33 to one decimal place. =
  38. 38.Which is closest to 900 + 701 + 697? (a) 2400 (b) 2300 (c) 2200 (d) 2500
  39. 39.Round 41.74 to one decimal place. =
  40. 40.Round 68732 to the nearest thousand.

Answer key

  1. 1500
  2. 6000
  3. 1300
  4. 50
  5. 1500
  6. 1500
  7. 28000
  8. 80
  9. 77360
  10. 14000
  11. 28000
  12. 2100
  13. 27000
  14. 15000
  15. 20000
  16. 25800
  17. 77900
  18. 2400
  19. 64000
  20. 36000
  21. 1900
  22. 43.7
  23. 13.8
  24. 66.9
  25. 15000
  26. 8610
  27. 20.8
  28. 1900
  29. 90520
  30. 90
  31. 20.4
  32. 49000
  33. 69.7
  34. 80
  35. 25.5
  36. 40000
  37. 27.3
  38. 2300
  39. 41.7
  40. 69000

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