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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 496 · 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 402 × 71? (Round each number first.) (a) 280000 (b) 28000 (c) 2800 (d) 56000
  2. 2.Round 79088 to the nearest hundred.
  3. 3.Round 76.88 to one decimal place. =
  4. 4.Round 97526 to the nearest ten.
  5. 5.Which is closest to 1198 ÷ 21? (a) 600 (b) 30 (c) 120 (d) 60
  6. 6.Which is closest to 296 × 21? (Round each number first.) (a) 600 (b) 60000 (c) 6000 (d) 12000
  7. 7.Which is closest to 1806 ÷ 21? (a) 45 (b) 90 (c) 900 (d) 180
  8. 8.Round 38537 to the nearest ten.
  9. 9.Round 5717 to the nearest thousand.
  10. 10.Round 78807 to the nearest thousand.
  11. 11.Round 1383 to the nearest ten.
  12. 12.Round 20.73 to one decimal place. =
  13. 13.Round 33.29 to one decimal place. =
  14. 14.Round 63.31 to one decimal place. =
  15. 15.Round 47.81 to one decimal place. =
  16. 16.Which is closest to 805 ÷ 39? (a) 40 (b) 200 (c) 10 (d) 20
  17. 17.Which is closest to 497 + 803 + 898? (a) 2100 (b) 2300 (c) 2400 (d) 2200
  18. 18.Which is closest to 495 + 903 + 703? (a) 2100 (b) 2200 (c) 2300 (d) 2000
  19. 19.Round 59004 to the nearest thousand.
  20. 20.Which is closest to 300 × 69? (Round each number first.) (a) 42000 (b) 210000 (c) 2100 (d) 21000
  21. 21.Which is closest to 1991 ÷ 39? (a) 500 (b) 25 (c) 100 (d) 50
  22. 22.Which is closest to 804 + 701 + 295? (a) 1700 (b) 2000 (c) 1800 (d) 1900
  23. 23.Which is closest to 408 ÷ 19? (a) 10 (b) 40 (c) 200 (d) 20
  24. 24.Round 95.47 to one decimal place. =
  25. 25.Round 18.51 to one decimal place. =
  26. 26.Round 30.82 to one decimal place. =
  27. 27.Round 69067 to the nearest thousand.
  28. 28.Round 84904 to the nearest thousand.
  29. 29.Which is closest to 1595 ÷ 39? (a) 40 (b) 20 (c) 400 (d) 80
  30. 30.Round 34.92 to one decimal place. =
  31. 31.Round 78751 to the nearest ten.
  32. 32.Which is closest to 204 × 39? (Round each number first.) (a) 80000 (b) 16000 (c) 8000 (d) 800
  33. 33.Round 28.92 to one decimal place. =
  34. 34.Round 76295 to the nearest hundred.
  35. 35.Round 11.42 to one decimal place. =
  36. 36.Round 67.86 to one decimal place. =
  37. 37.Which is closest to 603 + 198 + 701? (a) 1700 (b) 1500 (c) 1400 (d) 1600
  38. 38.Which is closest to 1594 ÷ 41? (a) 400 (b) 20 (c) 40 (d) 80
  39. 39.Which is closest to 608 ÷ 29? (a) 20 (b) 10 (c) 200 (d) 40
  40. 40.Which is closest to 404 + 498 + 805? (a) 1600 (b) 1900 (c) 1700 (d) 1800

Answer key

  1. 28000
  2. 79100
  3. 76.9
  4. 97530
  5. 60
  6. 6000
  7. 90
  8. 38540
  9. 6000
  10. 79000
  11. 1380
  12. 20.7
  13. 33.3
  14. 63.3
  15. 47.8
  16. 20
  17. 2200
  18. 2100
  19. 59000
  20. 21000
  21. 50
  22. 1800
  23. 20
  24. 95.5
  25. 18.5
  26. 30.8
  27. 69000
  28. 85000
  29. 40
  30. 34.9
  31. 78750
  32. 8000
  33. 28.9
  34. 76300
  35. 11.4
  36. 67.9
  37. 1500
  38. 40
  39. 20
  40. 1700

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