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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 846 · 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 496 × 92? (Round each number first.) (a) 4500 (b) 90000 (c) 45000 (d) 450000
  2. 2.Which is closest to 798 × 51? (Round each number first.) (a) 4000 (b) 400000 (c) 40000 (d) 80000
  3. 3.Round 50.63 to one decimal place. =
  4. 4.Round 75.17 to one decimal place. =
  5. 5.Round 79211 to the nearest thousand.
  6. 6.Which is closest to 499 + 103 + 904? (a) 1400 (b) 1700 (c) 1500 (d) 1600
  7. 7.Round 56036 to the nearest ten.
  8. 8.Which is closest to 396 × 19? (Round each number first.) (a) 80000 (b) 16000 (c) 800 (d) 8000
  9. 9.Which is closest to 2497 ÷ 51? (a) 50 (b) 25 (c) 100 (d) 500
  10. 10.Round 48075 to the nearest hundred.
  11. 11.Which is closest to 3205 ÷ 41? (a) 80 (b) 40 (c) 160 (d) 800
  12. 12.Round 79618 to the nearest thousand.
  13. 13.Round 33253 to the nearest thousand.
  14. 14.Which is closest to 102 + 301 + 896? (a) 1500 (b) 1400 (c) 1300 (d) 1200
  15. 15.Which is closest to 996 ÷ 19? (a) 100 (b) 25 (c) 500 (d) 50
  16. 16.Which is closest to 2009 ÷ 51? (a) 20 (b) 40 (c) 400 (d) 80
  17. 17.Which is closest to 899 × 59? (Round each number first.) (a) 540000 (b) 5400 (c) 108000 (d) 54000
  18. 18.Which is closest to 305 + 902 + 203? (a) 1300 (b) 1400 (c) 1500 (d) 1600
  19. 19.Round 77054 to the nearest hundred.
  20. 20.Which is closest to 2407 ÷ 41? (a) 60 (b) 120 (c) 600 (d) 30
  21. 21.Which is closest to 1595 ÷ 21? (a) 40 (b) 160 (c) 800 (d) 80
  22. 22.Which is closest to 697 × 21? (Round each number first.) (a) 140000 (b) 1400 (c) 28000 (d) 14000
  23. 23.Which is closest to 902 × 70? (Round each number first.) (a) 126000 (b) 630000 (c) 6300 (d) 63000
  24. 24.Round 47.94 to one decimal place. =
  25. 25.Round 25.62 to one decimal place. =
  26. 26.Round 75.43 to one decimal place. =
  27. 27.Round 67753 to the nearest thousand.
  28. 28.Which is closest to 497 + 795 + 496? (a) 2000 (b) 1700 (c) 1800 (d) 1900
  29. 29.Which is closest to 595 + 704 + 405? (a) 1900 (b) 1700 (c) 1800 (d) 1600
  30. 30.Which is closest to 100 + 98 + 305? (a) 500 (b) 400 (c) 600 (d) 700
  31. 31.Round 41184 to the nearest ten.
  32. 32.Round 56.94 to one decimal place. =
  33. 33.Round 23.82 to one decimal place. =
  34. 34.Which is closest to 901 × 58? (Round each number first.) (a) 540000 (b) 5400 (c) 108000 (d) 54000
  35. 35.Round 24907 to the nearest ten.
  36. 36.Which is closest to 297 × 70? (Round each number first.) (a) 42000 (b) 2100 (c) 210000 (d) 21000
  37. 37.Which is closest to 1200 ÷ 39? (a) 15 (b) 60 (c) 30 (d) 300
  38. 38.Round 14.66 to one decimal place. =
  39. 39.Round 34101 to the nearest ten.
  40. 40.Which is closest to 703 × 71? (Round each number first.) (a) 49000 (b) 98000 (c) 4900 (d) 490000

Answer key

  1. 45000
  2. 40000
  3. 50.6
  4. 75.2
  5. 79000
  6. 1500
  7. 56040
  8. 8000
  9. 50
  10. 48100
  11. 80
  12. 80000
  13. 33000
  14. 1300
  15. 50
  16. 40
  17. 54000
  18. 1400
  19. 77100
  20. 60
  21. 80
  22. 14000
  23. 63000
  24. 47.9
  25. 25.6
  26. 75.4
  27. 68000
  28. 1800
  29. 1700
  30. 500
  31. 41180
  32. 56.9
  33. 23.8
  34. 54000
  35. 24910
  36. 21000
  37. 30
  38. 14.7
  39. 34100
  40. 49000

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