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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 493 · 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 400 × 41? (Round each number first.) (a) 1600 (b) 32000 (c) 16000 (d) 160000
  2. 2.Which is closest to 397 × 69? (Round each number first.) (a) 2800 (b) 56000 (c) 280000 (d) 28000
  3. 3.Round 72689 to the nearest ten.
  4. 4.Round 73.57 to one decimal place. =
  5. 5.Which is closest to 597 + 99 + 301? (a) 1200 (b) 900 (c) 1000 (d) 1100
  6. 6.Round 83.61 to one decimal place. =
  7. 7.Which is closest to 503 + 596 + 301? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  8. 8.Which is closest to 2100 ÷ 29? (a) 70 (b) 140 (c) 700 (d) 35
  9. 9.Which is closest to 604 × 49? (Round each number first.) (a) 60000 (b) 300000 (c) 3000 (d) 30000
  10. 10.Which is closest to 700 × 68? (Round each number first.) (a) 98000 (b) 49000 (c) 490000 (d) 4900
  11. 11.Which is closest to 296 + 701 + 302? (a) 1200 (b) 1300 (c) 1400 (d) 1500
  12. 12.Round 89334 to the nearest ten.
  13. 13.Round 84661 to the nearest thousand.
  14. 14.Which is closest to 501 × 50? (Round each number first.) (a) 25000 (b) 250000 (c) 50000 (d) 2500
  15. 15.Round 31216 to the nearest thousand.
  16. 16.Which is closest to 497 + 404 + 301? (a) 1200 (b) 1300 (c) 1100 (d) 1400
  17. 17.Which is closest to 100 + 503 + 303? (a) 800 (b) 1100 (c) 900 (d) 1000
  18. 18.Round 8402 to the nearest ten.
  19. 19.Round 48.29 to one decimal place. =
  20. 20.Round 10.77 to one decimal place. =
  21. 21.Which is closest to 303 + 502 + 801? (a) 1800 (b) 1500 (c) 1600 (d) 1700
  22. 22.Round 48225 to the nearest hundred.
  23. 23.Which is closest to 1207 ÷ 29? (a) 20 (b) 80 (c) 400 (d) 40
  24. 24.Which is closest to 403 × 91? (Round each number first.) (a) 72000 (b) 3600 (c) 36000 (d) 360000
  25. 25.Which is closest to 197 × 38? (Round each number first.) (a) 8000 (b) 80000 (c) 16000 (d) 800
  26. 26.Which is closest to 3491 ÷ 51? (a) 700 (b) 35 (c) 70 (d) 140
  27. 27.Which is closest to 702 × 59? (Round each number first.) (a) 84000 (b) 420000 (c) 4200 (d) 42000
  28. 28.Which is closest to 304 + 599 + 401? (a) 1200 (b) 1300 (c) 1500 (d) 1400
  29. 29.Which is closest to 301 + 505 + 305? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  30. 30.Round 48.89 to one decimal place. =
  31. 31.Which is closest to 497 × 52? (Round each number first.) (a) 250000 (b) 50000 (c) 2500 (d) 25000
  32. 32.Which is closest to 305 + 897 + 204? (a) 1500 (b) 1600 (c) 1400 (d) 1300
  33. 33.Which is closest to 3602 ÷ 39? (a) 90 (b) 900 (c) 180 (d) 45
  34. 34.Which is closest to 901 + 101 + 205? (a) 1100 (b) 1400 (c) 1200 (d) 1300
  35. 35.Round 94.19 to one decimal place. =
  36. 36.Which is closest to 698 + 396 + 595? (a) 1600 (b) 1800 (c) 1900 (d) 1700
  37. 37.Round 64626 to the nearest hundred.
  38. 38.Which is closest to 2700 ÷ 31? (a) 900 (b) 45 (c) 180 (d) 90
  39. 39.Round 79.62 to one decimal place. =
  40. 40.Which is closest to 1194 ÷ 21? (a) 30 (b) 120 (c) 60 (d) 600

Answer key

  1. 16000
  2. 28000
  3. 72690
  4. 73.6
  5. 1000
  6. 83.6
  7. 1400
  8. 70
  9. 30000
  10. 49000
  11. 1300
  12. 89330
  13. 85000
  14. 25000
  15. 31000
  16. 1200
  17. 900
  18. 8400
  19. 48.3
  20. 10.8
  21. 1600
  22. 48200
  23. 40
  24. 36000
  25. 8000
  26. 70
  27. 42000
  28. 1300
  29. 1100
  30. 48.9
  31. 25000
  32. 1400
  33. 90
  34. 1200
  35. 94.2
  36. 1700
  37. 64600
  38. 90
  39. 79.6
  40. 60

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