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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 997 · 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 13.38 to one decimal place. =
  2. 2.Which is closest to 298 + 905 + 701? (a) 1800 (b) 2000 (c) 2100 (d) 1900
  3. 3.Which is closest to 397 × 58? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
  4. 4.Which is closest to 594 ÷ 19? (a) 15 (b) 30 (c) 60 (d) 300
  5. 5.Which is closest to 2091 ÷ 31? (a) 35 (b) 70 (c) 140 (d) 700
  6. 6.Which is closest to 904 × 31? (Round each number first.) (a) 27000 (b) 54000 (c) 270000 (d) 2700
  7. 7.Which is closest to 696 + 99 + 704? (a) 1600 (b) 1500 (c) 1700 (d) 1400
  8. 8.Round 8260 to the nearest hundred.
  9. 9.Which is closest to 300 × 89? (Round each number first.) (a) 27000 (b) 270000 (c) 54000 (d) 2700
  10. 10.Which is closest to 401 × 51? (Round each number first.) (a) 2000 (b) 20000 (c) 200000 (d) 40000
  11. 11.Which is closest to 297 × 78? (Round each number first.) (a) 24000 (b) 2400 (c) 48000 (d) 240000
  12. 12.Round 81304 to the nearest hundred.
  13. 13.Round 84.78 to one decimal place. =
  14. 14.Which is closest to 604 ÷ 29? (a) 10 (b) 20 (c) 40 (d) 200
  15. 15.Which is closest to 703 × 19? (Round each number first.) (a) 140000 (b) 14000 (c) 1400 (d) 28000
  16. 16.Round 90028 to the nearest thousand.
  17. 17.Which is closest to 304 × 78? (Round each number first.) (a) 240000 (b) 24000 (c) 48000 (d) 2400
  18. 18.Which is closest to 2502 ÷ 49? (a) 500 (b) 50 (c) 100 (d) 25
  19. 19.Which is closest to 799 × 70? (Round each number first.) (a) 5600 (b) 56000 (c) 112000 (d) 560000
  20. 20.Which is closest to 704 + 903 + 397? (a) 2000 (b) 2100 (c) 2200 (d) 1900
  21. 21.Round 49.87 to one decimal place. =
  22. 22.Round 27.23 to one decimal place. =
  23. 23.Which is closest to 397 + 696 + 903? (a) 2200 (b) 1900 (c) 2000 (d) 2100
  24. 24.Round 64066 to the nearest hundred.
  25. 25.Which is closest to 505 + 397 + 200? (a) 1300 (b) 1000 (c) 1100 (d) 1200
  26. 26.Which is closest to 97 + 601 + 497? (a) 1300 (b) 1400 (c) 1200 (d) 1100
  27. 27.Which is closest to 198 + 697 + 201? (a) 1100 (b) 1200 (c) 1000 (d) 1300
  28. 28.Round 57788 to the nearest hundred.
  29. 29.Which is closest to 198 + 802 + 199? (a) 1400 (b) 1100 (c) 1300 (d) 1200
  30. 30.Which is closest to 399 + 500 + 198? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  31. 31.Which is closest to 503 + 604 + 198? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  32. 32.Round 15.88 to one decimal place. =
  33. 33.Which is closest to 296 × 68? (Round each number first.) (a) 42000 (b) 2100 (c) 21000 (d) 210000
  34. 34.Which is closest to 1594 ÷ 41? (a) 80 (b) 20 (c) 400 (d) 40
  35. 35.Which is closest to 797 × 78? (Round each number first.) (a) 64000 (b) 6400 (c) 640000 (d) 128000
  36. 36.Round 61828 to the nearest ten.
  37. 37.Round 70.44 to one decimal place. =
  38. 38.Round 41.19 to one decimal place. =
  39. 39.Which is closest to 1594 ÷ 39? (a) 40 (b) 20 (c) 400 (d) 80
  40. 40.Round 54.09 to one decimal place. =

Answer key

  1. 13.4
  2. 1900
  3. 24000
  4. 30
  5. 70
  6. 27000
  7. 1500
  8. 8300
  9. 27000
  10. 20000
  11. 24000
  12. 81300
  13. 84.8
  14. 20
  15. 14000
  16. 90000
  17. 24000
  18. 50
  19. 56000
  20. 2000
  21. 49.9
  22. 27.2
  23. 2000
  24. 64100
  25. 1100
  26. 1200
  27. 1100
  28. 57800
  29. 1200
  30. 1100
  31. 1300
  32. 15.9
  33. 21000
  34. 40
  35. 64000
  36. 61830
  37. 70.4
  38. 41.2
  39. 40
  40. 54.1

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