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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 547 · 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 100 + 697 + 599? (a) 1500 (b) 1400 (c) 1300 (d) 1600
  2. 2.Which is closest to 800 + 300 + 801? (a) 1900 (b) 1800 (c) 2000 (d) 2100
  3. 3.Round 18.71 to one decimal place. =
  4. 4.Round 27699 to the nearest ten.
  5. 5.Round 20804 to the nearest ten.
  6. 6.Round 34.14 to one decimal place. =
  7. 7.Round 21.29 to one decimal place. =
  8. 8.Which is closest to 503 × 79? (Round each number first.) (a) 80000 (b) 400000 (c) 4000 (d) 40000
  9. 9.Round 69.38 to one decimal place. =
  10. 10.Round 98.41 to one decimal place. =
  11. 11.Which is closest to 299 × 82? (Round each number first.) (a) 240000 (b) 24000 (c) 48000 (d) 2400
  12. 12.Round 25.31 to one decimal place. =
  13. 13.Round 35795 to the nearest hundred.
  14. 14.Round 19.84 to one decimal place. =
  15. 15.Which is closest to 702 × 90? (Round each number first.) (a) 63000 (b) 630000 (c) 6300 (d) 126000
  16. 16.Which is closest to 2098 ÷ 31? (a) 700 (b) 140 (c) 70 (d) 35
  17. 17.Which is closest to 697 × 32? (Round each number first.) (a) 42000 (b) 2100 (c) 21000 (d) 210000
  18. 18.Which is closest to 904 + 498 + 304? (a) 1800 (b) 1900 (c) 1700 (d) 1600
  19. 19.Which is closest to 602 ÷ 19? (a) 300 (b) 15 (c) 30 (d) 60
  20. 20.Round 71.62 to one decimal place. =
  21. 21.Which is closest to 701 × 58? (Round each number first.) (a) 84000 (b) 42000 (c) 420000 (d) 4200
  22. 22.Round 69.39 to one decimal place. =
  23. 23.Which is closest to 497 × 91? (Round each number first.) (a) 4500 (b) 45000 (c) 450000 (d) 90000
  24. 24.Round 53004 to the nearest ten.
  25. 25.Which is closest to 1009 ÷ 19? (a) 25 (b) 500 (c) 100 (d) 50
  26. 26.Which is closest to 1403 ÷ 19? (a) 700 (b) 70 (c) 35 (d) 140
  27. 27.Which is closest to 3204 ÷ 39? (a) 160 (b) 80 (c) 40 (d) 800
  28. 28.Round 67.88 to one decimal place. =
  29. 29.Which is closest to 695 + 300 + 795? (a) 1900 (b) 1800 (c) 2000 (d) 1700
  30. 30.Round 24.18 to one decimal place. =
  31. 31.Which is closest to 202 × 31? (Round each number first.) (a) 6000 (b) 12000 (c) 60000 (d) 600
  32. 32.Round 60.73 to one decimal place. =
  33. 33.Which is closest to 501 × 82? (Round each number first.) (a) 4000 (b) 400000 (c) 40000 (d) 80000
  34. 34.Round 19844 to the nearest hundred.
  35. 35.Round 15.34 to one decimal place. =
  36. 36.Which is closest to 502 × 21? (Round each number first.) (a) 1000 (b) 20000 (c) 10000 (d) 100000
  37. 37.Round 79836 to the nearest ten.
  38. 38.Which is closest to 197 × 39? (Round each number first.) (a) 8000 (b) 16000 (c) 800 (d) 80000
  39. 39.Which is closest to 804 + 100 + 497? (a) 1300 (b) 1400 (c) 1500 (d) 1600
  40. 40.Which is closest to 504 + 97 + 297? (a) 900 (b) 1100 (c) 1000 (d) 800

Answer key

  1. 1400
  2. 1900
  3. 18.7
  4. 27700
  5. 20800
  6. 34.1
  7. 21.3
  8. 40000
  9. 69.4
  10. 98.4
  11. 24000
  12. 25.3
  13. 35800
  14. 19.8
  15. 63000
  16. 70
  17. 21000
  18. 1700
  19. 30
  20. 71.6
  21. 42000
  22. 69.4
  23. 45000
  24. 53000
  25. 50
  26. 70
  27. 80
  28. 67.9
  29. 1800
  30. 24.2
  31. 6000
  32. 60.7
  33. 40000
  34. 19800
  35. 15.3
  36. 10000
  37. 79840
  38. 8000
  39. 1400
  40. 900

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