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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 886 · 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 48867 to the nearest hundred.
  2. 2.Which is closest to 197 × 78? (Round each number first.) (a) 1600 (b) 160000 (c) 32000 (d) 16000
  3. 3.Which is closest to 199 × 88? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  4. 4.Round 34.86 to one decimal place. =
  5. 5.Which is closest to 2006 ÷ 39? (a) 500 (b) 25 (c) 50 (d) 100
  6. 6.Which is closest to 200 + 702 + 800? (a) 1800 (b) 1700 (c) 1900 (d) 1600
  7. 7.Which is closest to 599 + 603 + 96? (a) 1300 (b) 1500 (c) 1400 (d) 1200
  8. 8.Which is closest to 700 × 69? (Round each number first.) (a) 4900 (b) 490000 (c) 98000 (d) 49000
  9. 9.Which is closest to 1201 ÷ 41? (a) 30 (b) 300 (c) 15 (d) 60
  10. 10.Round 75.79 to one decimal place. =
  11. 11.Which is closest to 495 + 304 + 396? (a) 1400 (b) 1200 (c) 1300 (d) 1100
  12. 12.Which is closest to 195 + 305 + 498? (a) 1100 (b) 900 (c) 1200 (d) 1000
  13. 13.Which is closest to 2702 ÷ 29? (a) 900 (b) 45 (c) 180 (d) 90
  14. 14.Round 41.31 to one decimal place. =
  15. 15.Which is closest to 396 + 696 + 101? (a) 1100 (b) 1400 (c) 1300 (d) 1200
  16. 16.Which is closest to 405 + 395 + 295? (a) 1300 (b) 1100 (c) 1200 (d) 1000
  17. 17.Round 65879 to the nearest ten.
  18. 18.Round 39132 to the nearest thousand.
  19. 19.Round 65.38 to one decimal place. =
  20. 20.Round 25.42 to one decimal place. =
  21. 21.Which is closest to 1993 ÷ 51? (a) 40 (b) 20 (c) 400 (d) 80
  22. 22.Which is closest to 504 × 42? (Round each number first.) (a) 2000 (b) 200000 (c) 40000 (d) 20000
  23. 23.Which is closest to 2405 ÷ 29? (a) 800 (b) 160 (c) 40 (d) 80
  24. 24.Round 46.57 to one decimal place. =
  25. 25.Round 46.81 to one decimal place. =
  26. 26.Which is closest to 3497 ÷ 49? (a) 140 (b) 700 (c) 35 (d) 70
  27. 27.Which is closest to 396 × 31? (Round each number first.) (a) 120000 (b) 1200 (c) 12000 (d) 24000
  28. 28.Round 2658 to the nearest ten.
  29. 29.Round 83916 to the nearest ten.
  30. 30.Which is closest to 496 × 42? (Round each number first.) (a) 20000 (b) 200000 (c) 40000 (d) 2000
  31. 31.Round 41.93 to one decimal place. =
  32. 32.Round 25.86 to one decimal place. =
  33. 33.Which is closest to 498 × 90? (Round each number first.) (a) 45000 (b) 450000 (c) 90000 (d) 4500
  34. 34.Which is closest to 898 × 70? (Round each number first.) (a) 6300 (b) 63000 (c) 126000 (d) 630000
  35. 35.Round 76528 to the nearest hundred.
  36. 36.Round 9539 to the nearest hundred.
  37. 37.Which is closest to 806 ÷ 19? (a) 40 (b) 80 (c) 20 (d) 400
  38. 38.Round 46005 to the nearest hundred.
  39. 39.Round 89769 to the nearest hundred.
  40. 40.Which is closest to 391 ÷ 21? (a) 20 (b) 200 (c) 10 (d) 40

Answer key

  1. 48900
  2. 16000
  3. 18000
  4. 34.9
  5. 50
  6. 1700
  7. 1300
  8. 49000
  9. 30
  10. 75.8
  11. 1200
  12. 1000
  13. 90
  14. 41.3
  15. 1200
  16. 1100
  17. 65880
  18. 39000
  19. 65.4
  20. 25.4
  21. 40
  22. 20000
  23. 80
  24. 46.6
  25. 46.8
  26. 70
  27. 12000
  28. 2660
  29. 83920
  30. 20000
  31. 41.9
  32. 25.9
  33. 45000
  34. 63000
  35. 76500
  36. 9500
  37. 40
  38. 46000
  39. 89800
  40. 20

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