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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 487 · 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 504 × 90? (Round each number first.) (a) 450000 (b) 45000 (c) 4500 (d) 90000
  2. 2.Which is closest to 197 × 30? (Round each number first.) (a) 12000 (b) 6000 (c) 60000 (d) 600
  3. 3.Round 71048 to the nearest ten.
  4. 4.Round 30.14 to one decimal place. =
  5. 5.Round 16.73 to one decimal place. =
  6. 6.Which is closest to 705 + 303 + 605? (a) 1700 (b) 1800 (c) 1500 (d) 1600
  7. 7.Which is closest to 397 × 72? (Round each number first.) (a) 2800 (b) 28000 (c) 56000 (d) 280000
  8. 8.Which is closest to 201 × 79? (Round each number first.) (a) 16000 (b) 160000 (c) 1600 (d) 32000
  9. 9.Round 12551 to the nearest hundred.
  10. 10.Which is closest to 901 + 101 + 495? (a) 1400 (b) 1700 (c) 1500 (d) 1600
  11. 11.Round 21521 to the nearest hundred.
  12. 12.Round 13.53 to one decimal place. =
  13. 13.Which is closest to 2098 ÷ 29? (a) 700 (b) 35 (c) 70 (d) 140
  14. 14.Which is closest to 403 ÷ 21? (a) 40 (b) 200 (c) 20 (d) 10
  15. 15.Which is closest to 404 + 695 + 104? (a) 1300 (b) 1200 (c) 1100 (d) 1400
  16. 16.Which is closest to 296 × 92? (Round each number first.) (a) 54000 (b) 2700 (c) 270000 (d) 27000
  17. 17.Which is closest to 3502 ÷ 49? (a) 700 (b) 70 (c) 35 (d) 140
  18. 18.Which is closest to 203 + 396 + 197? (a) 1000 (b) 800 (c) 700 (d) 900
  19. 19.Round 80.46 to one decimal place. =
  20. 20.Which is closest to 296 + 197 + 903? (a) 1600 (b) 1500 (c) 1300 (d) 1400
  21. 21.Round 17079 to the nearest thousand.
  22. 22.Which is closest to 401 × 28? (Round each number first.) (a) 12000 (b) 24000 (c) 1200 (d) 120000
  23. 23.Which is closest to 597 × 49? (Round each number first.) (a) 300000 (b) 3000 (c) 30000 (d) 60000
  24. 24.Round 36.06 to one decimal place. =
  25. 25.Which is closest to 597 × 31? (Round each number first.) (a) 36000 (b) 18000 (c) 180000 (d) 1800
  26. 26.Which is closest to 604 × 48? (Round each number first.) (a) 30000 (b) 3000 (c) 60000 (d) 300000
  27. 27.Round 73965 to the nearest hundred.
  28. 28.Round 28.24 to one decimal place. =
  29. 29.Which is closest to 399 × 51? (Round each number first.) (a) 2000 (b) 200000 (c) 20000 (d) 40000
  30. 30.Which is closest to 1999 ÷ 51? (a) 40 (b) 20 (c) 400 (d) 80
  31. 31.Which is closest to 802 × 20? (Round each number first.) (a) 16000 (b) 160000 (c) 32000 (d) 1600
  32. 32.Which is closest to 599 + 599 + 99? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  33. 33.Which is closest to 402 × 18? (Round each number first.) (a) 80000 (b) 800 (c) 8000 (d) 16000
  34. 34.Round 20245 to the nearest thousand.
  35. 35.Which is closest to 905 + 702 + 505? (a) 2100 (b) 2300 (c) 2200 (d) 2000
  36. 36.Which is closest to 600 × 22? (Round each number first.) (a) 24000 (b) 120000 (c) 1200 (d) 12000
  37. 37.Round 86.87 to one decimal place. =
  38. 38.Which is closest to 501 + 604 + 701? (a) 1900 (b) 1700 (c) 2000 (d) 1800
  39. 39.Which is closest to 894 ÷ 29? (a) 15 (b) 300 (c) 60 (d) 30
  40. 40.Round 30.93 to one decimal place. =

Answer key

  1. 45000
  2. 6000
  3. 71050
  4. 30.1
  5. 16.7
  6. 1600
  7. 28000
  8. 16000
  9. 12600
  10. 1500
  11. 21500
  12. 13.5
  13. 70
  14. 20
  15. 1200
  16. 27000
  17. 70
  18. 800
  19. 80.5
  20. 1400
  21. 17000
  22. 12000
  23. 30000
  24. 36.1
  25. 18000
  26. 30000
  27. 74000
  28. 28.2
  29. 20000
  30. 40
  31. 16000
  32. 1300
  33. 8000
  34. 20000
  35. 2100
  36. 12000
  37. 86.9
  38. 1800
  39. 30
  40. 30.9

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