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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 899 · 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 1509 ÷ 51? (a) 30 (b) 60 (c) 300 (d) 15
  2. 2.Which is closest to 2399 ÷ 29? (a) 160 (b) 40 (c) 800 (d) 80
  3. 3.Which is closest to 3596 ÷ 39? (a) 900 (b) 180 (c) 90 (d) 45
  4. 4.Which is closest to 801 × 71? (Round each number first.) (a) 5600 (b) 56000 (c) 112000 (d) 560000
  5. 5.Which is closest to 903 + 100 + 96? (a) 1100 (b) 1000 (c) 1200 (d) 1300
  6. 6.Round 37.73 to one decimal place. =
  7. 7.Round 8483 to the nearest ten.
  8. 8.Round 23.62 to one decimal place. =
  9. 9.Round 54.09 to one decimal place. =
  10. 10.Which is closest to 595 ÷ 21? (a) 15 (b) 300 (c) 30 (d) 60
  11. 11.Round 38.13 to one decimal place. =
  12. 12.Round 52.52 to one decimal place. =
  13. 13.Round 84.53 to one decimal place. =
  14. 14.Round 96.66 to one decimal place. =
  15. 15.Round 70.16 to one decimal place. =
  16. 16.Round 21476 to the nearest ten.
  17. 17.Round 84166 to the nearest thousand.
  18. 18.Round 62590 to the nearest hundred.
  19. 19.Which is closest to 95 + 804 + 803? (a) 1700 (b) 1900 (c) 1600 (d) 1800
  20. 20.Which is closest to 1200 ÷ 31? (a) 80 (b) 40 (c) 20 (d) 400
  21. 21.Which is closest to 697 × 91? (Round each number first.) (a) 63000 (b) 6300 (c) 126000 (d) 630000
  22. 22.Which is closest to 1207 ÷ 19? (a) 60 (b) 600 (c) 30 (d) 120
  23. 23.Round 45.89 to one decimal place. =
  24. 24.Round 24.74 to one decimal place. =
  25. 25.Which is closest to 900 × 58? (Round each number first.) (a) 108000 (b) 54000 (c) 5400 (d) 540000
  26. 26.Which is closest to 4498 ÷ 51? (a) 90 (b) 900 (c) 180 (d) 45
  27. 27.Round 59.34 to one decimal place. =
  28. 28.Which is closest to 896 × 62? (Round each number first.) (a) 108000 (b) 5400 (c) 540000 (d) 54000
  29. 29.Which is closest to 396 × 70? (Round each number first.) (a) 2800 (b) 56000 (c) 28000 (d) 280000
  30. 30.Which is closest to 503 × 31? (Round each number first.) (a) 1500 (b) 15000 (c) 30000 (d) 150000
  31. 31.Which is closest to 695 + 804 + 401? (a) 2100 (b) 1800 (c) 1900 (d) 2000
  32. 32.Which is closest to 3007 ÷ 49? (a) 30 (b) 60 (c) 120 (d) 600
  33. 33.Round 12.51 to one decimal place. =
  34. 34.Which is closest to 600 × 31? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  35. 35.Which is closest to 697 × 31? (Round each number first.) (a) 21000 (b) 2100 (c) 42000 (d) 210000
  36. 36.Round 56.52 to one decimal place. =
  37. 37.Which is closest to 2694 ÷ 31? (a) 900 (b) 180 (c) 45 (d) 90
  38. 38.Which is closest to 700 × 29? (Round each number first.) (a) 210000 (b) 42000 (c) 21000 (d) 2100
  39. 39.Which is closest to 903 × 89? (Round each number first.) (a) 8100 (b) 810000 (c) 162000 (d) 81000
  40. 40.Which is closest to 900 + 799 + 703? (a) 2400 (b) 2300 (c) 2500 (d) 2600

Answer key

  1. 30
  2. 80
  3. 90
  4. 56000
  5. 1100
  6. 37.7
  7. 8480
  8. 23.6
  9. 54.1
  10. 30
  11. 38.1
  12. 52.5
  13. 84.5
  14. 96.7
  15. 70.2
  16. 21480
  17. 84000
  18. 62600
  19. 1700
  20. 40
  21. 63000
  22. 60
  23. 45.9
  24. 24.7
  25. 54000
  26. 90
  27. 59.3
  28. 54000
  29. 28000
  30. 15000
  31. 1900
  32. 60
  33. 12.5
  34. 18000
  35. 21000
  36. 56.5
  37. 90
  38. 21000
  39. 81000
  40. 2400

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