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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 705 · 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 28.36 to one decimal place. =
  2. 2.Which is closest to 499 × 49? (Round each number first.) (a) 50000 (b) 250000 (c) 25000 (d) 2500
  3. 3.Round 96.08 to one decimal place. =
  4. 4.Round 78696 to the nearest hundred.
  5. 5.Round 41.13 to one decimal place. =
  6. 6.Round 34.68 to one decimal place. =
  7. 7.Round 26.56 to one decimal place. =
  8. 8.Round 53.27 to one decimal place. =
  9. 9.Round 12525 to the nearest thousand.
  10. 10.Round 77147 to the nearest thousand.
  11. 11.Which is closest to 902 × 41? (Round each number first.) (a) 360000 (b) 36000 (c) 72000 (d) 3600
  12. 12.Which is closest to 299 + 197 + 600? (a) 1100 (b) 1300 (c) 1000 (d) 1200
  13. 13.Round 15.69 to one decimal place. =
  14. 14.Round 88.34 to one decimal place. =
  15. 15.Round 53043 to the nearest thousand.
  16. 16.Round 53.62 to one decimal place. =
  17. 17.Which is closest to 804 × 48? (Round each number first.) (a) 40000 (b) 4000 (c) 80000 (d) 400000
  18. 18.Round 80.92 to one decimal place. =
  19. 19.Which is closest to 1006 ÷ 49? (a) 20 (b) 40 (c) 200 (d) 10
  20. 20.Which is closest to 202 × 71? (Round each number first.) (a) 14000 (b) 1400 (c) 140000 (d) 28000
  21. 21.Which is closest to 3499 ÷ 51? (a) 35 (b) 70 (c) 700 (d) 140
  22. 22.Which is closest to 2504 ÷ 51? (a) 25 (b) 500 (c) 50 (d) 100
  23. 23.Round 87347 to the nearest hundred.
  24. 24.Round 33112 to the nearest ten.
  25. 25.Round 3042 to the nearest ten.
  26. 26.Which is closest to 598 × 80? (Round each number first.) (a) 4800 (b) 48000 (c) 96000 (d) 480000
  27. 27.Round 82815 to the nearest thousand.
  28. 28.Round 94.77 to one decimal place. =
  29. 29.Which is closest to 1607 ÷ 41? (a) 80 (b) 20 (c) 40 (d) 400
  30. 30.Which is closest to 503 + 103 + 404? (a) 1200 (b) 1100 (c) 1000 (d) 900
  31. 31.Which is closest to 102 + 895 + 600? (a) 1500 (b) 1600 (c) 1700 (d) 1800
  32. 32.Which is closest to 1793 ÷ 19? (a) 45 (b) 90 (c) 180 (d) 900
  33. 33.Which is closest to 1495 ÷ 51? (a) 15 (b) 30 (c) 300 (d) 60
  34. 34.Which is closest to 98 + 499 + 498? (a) 1000 (b) 1200 (c) 1300 (d) 1100
  35. 35.Round 20.94 to one decimal place. =
  36. 36.Round 57132 to the nearest ten.
  37. 37.Which is closest to 602 × 32? (Round each number first.) (a) 180000 (b) 1800 (c) 18000 (d) 36000
  38. 38.Round 51697 to the nearest hundred.
  39. 39.Round 12.72 to one decimal place. =
  40. 40.Which is closest to 605 ÷ 19? (a) 300 (b) 60 (c) 15 (d) 30

Answer key

  1. 28.4
  2. 25000
  3. 96.1
  4. 78700
  5. 41.1
  6. 34.7
  7. 26.6
  8. 53.3
  9. 13000
  10. 77000
  11. 36000
  12. 1100
  13. 15.7
  14. 88.3
  15. 53000
  16. 53.6
  17. 40000
  18. 80.9
  19. 20
  20. 14000
  21. 70
  22. 50
  23. 87300
  24. 33110
  25. 3040
  26. 48000
  27. 83000
  28. 94.8
  29. 40
  30. 1000
  31. 1600
  32. 90
  33. 30
  34. 1100
  35. 20.9
  36. 57130
  37. 18000
  38. 51700
  39. 12.7
  40. 30

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