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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 390 · 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 48.76 to one decimal place. =
  2. 2.Round 42.36 to one decimal place. =
  3. 3.Which is closest to 1597 ÷ 19? (a) 40 (b) 80 (c) 800 (d) 160
  4. 4.Which is closest to 607 ÷ 21? (a) 30 (b) 300 (c) 15 (d) 60
  5. 5.Round 86.23 to one decimal place. =
  6. 6.Round 67.93 to one decimal place. =
  7. 7.Which is closest to 705 + 595 + 798? (a) 2100 (b) 2000 (c) 2300 (d) 2200
  8. 8.Which is closest to 496 × 19? (Round each number first.) (a) 1000 (b) 20000 (c) 100000 (d) 10000
  9. 9.Round 70.41 to one decimal place. =
  10. 10.Round 19543 to the nearest ten.
  11. 11.Which is closest to 797 × 49? (Round each number first.) (a) 4000 (b) 80000 (c) 40000 (d) 400000
  12. 12.Which is closest to 601 × 71? (Round each number first.) (a) 420000 (b) 42000 (c) 4200 (d) 84000
  13. 13.Round 78.86 to one decimal place. =
  14. 14.Which is closest to 204 + 504 + 702? (a) 1600 (b) 1300 (c) 1500 (d) 1400
  15. 15.Round 85289 to the nearest ten.
  16. 16.Which is closest to 699 × 41? (Round each number first.) (a) 56000 (b) 28000 (c) 2800 (d) 280000
  17. 17.Which is closest to 1609 ÷ 41? (a) 20 (b) 400 (c) 40 (d) 80
  18. 18.Which is closest to 3595 ÷ 41? (a) 900 (b) 180 (c) 45 (d) 90
  19. 19.Which is closest to 500 × 82? (Round each number first.) (a) 4000 (b) 80000 (c) 400000 (d) 40000
  20. 20.Round 97741 to the nearest thousand.
  21. 21.Which is closest to 296 + 96 + 495? (a) 900 (b) 1000 (c) 800 (d) 1100
  22. 22.Round 44.24 to one decimal place. =
  23. 23.Which is closest to 1600 ÷ 21? (a) 800 (b) 80 (c) 40 (d) 160
  24. 24.Which is closest to 603 ÷ 31? (a) 10 (b) 40 (c) 20 (d) 200
  25. 25.Round 45.22 to one decimal place. =
  26. 26.Round 60.72 to one decimal place. =
  27. 27.Which is closest to 904 × 28? (Round each number first.) (a) 2700 (b) 27000 (c) 54000 (d) 270000
  28. 28.Round 61.82 to one decimal place. =
  29. 29.Round 91521 to the nearest hundred.
  30. 30.Which is closest to 803 × 68? (Round each number first.) (a) 112000 (b) 56000 (c) 560000 (d) 5600
  31. 31.Which is closest to 396 × 68? (Round each number first.) (a) 2800 (b) 28000 (c) 56000 (d) 280000
  32. 32.Which is closest to 399 + 202 + 595? (a) 1300 (b) 1200 (c) 1100 (d) 1400
  33. 33.Which is closest to 4008 ÷ 51? (a) 80 (b) 160 (c) 800 (d) 40
  34. 34.Which is closest to 201 × 18? (Round each number first.) (a) 4000 (b) 400 (c) 40000 (d) 8000
  35. 35.Which is closest to 695 + 400 + 104? (a) 1100 (b) 1400 (c) 1200 (d) 1300
  36. 36.Round 72.11 to one decimal place. =
  37. 37.Which is closest to 398 × 32? (Round each number first.) (a) 12000 (b) 120000 (c) 1200 (d) 24000
  38. 38.Which is closest to 1803 ÷ 29? (a) 30 (b) 120 (c) 60 (d) 600
  39. 39.Round 89406 to the nearest hundred.
  40. 40.Which is closest to 800 × 22? (Round each number first.) (a) 1600 (b) 32000 (c) 16000 (d) 160000

Answer key

  1. 48.8
  2. 42.4
  3. 80
  4. 30
  5. 86.2
  6. 67.9
  7. 2100
  8. 10000
  9. 70.4
  10. 19540
  11. 40000
  12. 42000
  13. 78.9
  14. 1400
  15. 85290
  16. 28000
  17. 40
  18. 90
  19. 40000
  20. 98000
  21. 900
  22. 44.2
  23. 80
  24. 20
  25. 45.2
  26. 60.7
  27. 27000
  28. 61.8
  29. 91500
  30. 56000
  31. 28000
  32. 1200
  33. 80
  34. 4000
  35. 1200
  36. 72.1
  37. 12000
  38. 60
  39. 89400
  40. 16000

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