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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 108 · 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 296 × 50? (Round each number first.) (a) 1500 (b) 150000 (c) 30000 (d) 15000
  2. 2.Round 90.31 to one decimal place. =
  3. 3.Which is closest to 105 + 400 + 900? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  4. 4.Round 22132 to the nearest hundred.
  5. 5.Which is closest to 896 × 38? (Round each number first.) (a) 360000 (b) 3600 (c) 36000 (d) 72000
  6. 6.Which is closest to 3193 ÷ 39? (a) 160 (b) 40 (c) 800 (d) 80
  7. 7.Which is closest to 498 × 81? (Round each number first.) (a) 400000 (b) 40000 (c) 4000 (d) 80000
  8. 8.Which is closest to 803 × 72? (Round each number first.) (a) 112000 (b) 560000 (c) 56000 (d) 5600
  9. 9.Which is closest to 298 × 72? (Round each number first.) (a) 210000 (b) 42000 (c) 2100 (d) 21000
  10. 10.Which is closest to 105 + 504 + 795? (a) 1600 (b) 1500 (c) 1400 (d) 1300
  11. 11.Round 6231 to the nearest thousand.
  12. 12.Which is closest to 905 + 199 + 703? (a) 2000 (b) 1900 (c) 1700 (d) 1800
  13. 13.Which is closest to 797 × 22? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
  14. 14.Round 12.94 to one decimal place. =
  15. 15.Which is closest to 700 + 505 + 803? (a) 2100 (b) 1900 (c) 2200 (d) 2000
  16. 16.Which is closest to 596 + 595 + 897? (a) 2100 (b) 2000 (c) 2200 (d) 2300
  17. 17.Round 11.08 to one decimal place. =
  18. 18.Round 21811 to the nearest hundred.
  19. 19.Round 45886 to the nearest ten.
  20. 20.Round 83828 to the nearest ten.
  21. 21.Round 72.43 to one decimal place. =
  22. 22.Which is closest to 296 × 48? (Round each number first.) (a) 150000 (b) 30000 (c) 15000 (d) 1500
  23. 23.Round 85.71 to one decimal place. =
  24. 24.Round 28854 to the nearest ten.
  25. 25.Which is closest to 901 + 695 + 504? (a) 2300 (b) 2200 (c) 2100 (d) 2000
  26. 26.Round 57.92 to one decimal place. =
  27. 27.Which is closest to 302 + 200 + 903? (a) 1600 (b) 1500 (c) 1400 (d) 1300
  28. 28.Round 13.53 to one decimal place. =
  29. 29.Which is closest to 105 + 105 + 802? (a) 1100 (b) 1200 (c) 900 (d) 1000
  30. 30.Which is closest to 897 + 703 + 199? (a) 1900 (b) 1800 (c) 1700 (d) 2000
  31. 31.Which is closest to 900 × 19? (Round each number first.) (a) 18000 (b) 180000 (c) 1800 (d) 36000
  32. 32.Which is closest to 397 × 70? (Round each number first.) (a) 280000 (b) 2800 (c) 56000 (d) 28000
  33. 33.Round 42817 to the nearest thousand.
  34. 34.Round 32.71 to one decimal place. =
  35. 35.Which is closest to 3600 ÷ 41? (a) 90 (b) 180 (c) 900 (d) 45
  36. 36.Which is closest to 697 + 805 + 199? (a) 1900 (b) 1600 (c) 1700 (d) 1800
  37. 37.Round 81.09 to one decimal place. =
  38. 38.Round 32921 to the nearest hundred.
  39. 39.Round 57.44 to one decimal place. =
  40. 40.Which is closest to 2400 ÷ 29? (a) 800 (b) 80 (c) 40 (d) 160

Answer key

  1. 15000
  2. 90.3
  3. 1400
  4. 22100
  5. 36000
  6. 80
  7. 40000
  8. 56000
  9. 21000
  10. 1400
  11. 6000
  12. 1800
  13. 16000
  14. 12.9
  15. 2000
  16. 2100
  17. 11.1
  18. 21800
  19. 45890
  20. 83830
  21. 72.4
  22. 15000
  23. 85.7
  24. 28850
  25. 2100
  26. 57.9
  27. 1400
  28. 13.5
  29. 1000
  30. 1800
  31. 18000
  32. 28000
  33. 43000
  34. 32.7
  35. 90
  36. 1700
  37. 81.1
  38. 32900
  39. 57.4
  40. 80

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