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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 324 · 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 1806 ÷ 21? (a) 45 (b) 900 (c) 90 (d) 180
  2. 2.Round 10917 to the nearest ten.
  3. 3.Which is closest to 298 × 92? (Round each number first.) (a) 54000 (b) 270000 (c) 27000 (d) 2700
  4. 4.Round 66.57 to one decimal place. =
  5. 5.Which is closest to 404 × 28? (Round each number first.) (a) 24000 (b) 120000 (c) 1200 (d) 12000
  6. 6.Round 27.13 to one decimal place. =
  7. 7.Which is closest to 1200 ÷ 19? (a) 120 (b) 60 (c) 600 (d) 30
  8. 8.Which is closest to 696 × 72? (Round each number first.) (a) 98000 (b) 49000 (c) 490000 (d) 4900
  9. 9.Which is closest to 805 + 104 + 97? (a) 1100 (b) 1000 (c) 900 (d) 1200
  10. 10.Which is closest to 798 × 82? (Round each number first.) (a) 128000 (b) 640000 (c) 64000 (d) 6400
  11. 11.Round 38.92 to one decimal place. =
  12. 12.Which is closest to 398 × 92? (Round each number first.) (a) 3600 (b) 72000 (c) 360000 (d) 36000
  13. 13.Round 42670 to the nearest thousand.
  14. 14.Which is closest to 3506 ÷ 51? (a) 70 (b) 35 (c) 140 (d) 700
  15. 15.Which is closest to 404 × 21? (Round each number first.) (a) 80000 (b) 16000 (c) 800 (d) 8000
  16. 16.Which is closest to 397 × 89? (Round each number first.) (a) 360000 (b) 72000 (c) 3600 (d) 36000
  17. 17.Which is closest to 399 + 704 + 595? (a) 1800 (b) 1600 (c) 1900 (d) 1700
  18. 18.Which is closest to 795 + 798 + 495? (a) 2100 (b) 2000 (c) 2300 (d) 2200
  19. 19.Which is closest to 3192 ÷ 39? (a) 40 (b) 160 (c) 800 (d) 80
  20. 20.Which is closest to 1395 ÷ 19? (a) 140 (b) 70 (c) 700 (d) 35
  21. 21.Round 45.28 to one decimal place. =
  22. 22.Round 41.63 to one decimal place. =
  23. 23.Which is closest to 797 × 48? (Round each number first.) (a) 400000 (b) 80000 (c) 4000 (d) 40000
  24. 24.Round 53346 to the nearest thousand.
  25. 25.Round 95.73 to one decimal place. =
  26. 26.Which is closest to 905 + 295 + 504? (a) 1600 (b) 1700 (c) 1900 (d) 1800
  27. 27.Round 33323 to the nearest thousand.
  28. 28.Which is closest to 301 × 39? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
  29. 29.Round 93.73 to one decimal place. =
  30. 30.Which is closest to 402 × 89? (Round each number first.) (a) 72000 (b) 360000 (c) 3600 (d) 36000
  31. 31.Which is closest to 1197 ÷ 29? (a) 20 (b) 40 (c) 400 (d) 80
  32. 32.Round 40.28 to one decimal place. =
  33. 33.Which is closest to 794 ÷ 21? (a) 40 (b) 400 (c) 80 (d) 20
  34. 34.Which is closest to 2397 ÷ 41? (a) 600 (b) 60 (c) 30 (d) 120
  35. 35.Which is closest to 2704 ÷ 31? (a) 90 (b) 900 (c) 45 (d) 180
  36. 36.Which is closest to 403 × 68? (Round each number first.) (a) 2800 (b) 28000 (c) 280000 (d) 56000
  37. 37.Round 19.76 to one decimal place. =
  38. 38.Which is closest to 197 + 97 + 496? (a) 1000 (b) 700 (c) 800 (d) 900
  39. 39.Which is closest to 700 + 295 + 505? (a) 1600 (b) 1700 (c) 1400 (d) 1500
  40. 40.Which is closest to 397 × 62? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000

Answer key

  1. 90
  2. 10920
  3. 27000
  4. 66.6
  5. 12000
  6. 27.1
  7. 60
  8. 49000
  9. 1000
  10. 64000
  11. 38.9
  12. 36000
  13. 43000
  14. 70
  15. 8000
  16. 36000
  17. 1700
  18. 2100
  19. 80
  20. 70
  21. 45.3
  22. 41.6
  23. 40000
  24. 53000
  25. 95.7
  26. 1700
  27. 33000
  28. 12000
  29. 93.7
  30. 36000
  31. 40
  32. 40.3
  33. 40
  34. 60
  35. 90
  36. 28000
  37. 19.8
  38. 800
  39. 1500
  40. 24000

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