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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 944 · 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 23.77 to one decimal place. =
  2. 2.Round 25586 to the nearest hundred.
  3. 3.Which is closest to 1401 ÷ 19? (a) 140 (b) 35 (c) 70 (d) 700
  4. 4.Which is closest to 1204 ÷ 39? (a) 30 (b) 300 (c) 60 (d) 15
  5. 5.Which is closest to 204 + 498 + 98? (a) 700 (b) 1000 (c) 900 (d) 800
  6. 6.Which is closest to 605 + 600 + 704? (a) 1900 (b) 2100 (c) 1800 (d) 2000
  7. 7.Which is closest to 404 × 20? (Round each number first.) (a) 8000 (b) 800 (c) 80000 (d) 16000
  8. 8.Which is closest to 197 + 700 + 496? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  9. 9.Which is closest to 604 × 49? (Round each number first.) (a) 30000 (b) 300000 (c) 60000 (d) 3000
  10. 10.Which is closest to 2991 ÷ 49? (a) 600 (b) 120 (c) 30 (d) 60
  11. 11.Which is closest to 204 × 79? (Round each number first.) (a) 16000 (b) 1600 (c) 32000 (d) 160000
  12. 12.Which is closest to 196 × 72? (Round each number first.) (a) 28000 (b) 140000 (c) 1400 (d) 14000
  13. 13.Which is closest to 2800 ÷ 41? (a) 700 (b) 140 (c) 35 (d) 70
  14. 14.Which is closest to 496 × 61? (Round each number first.) (a) 300000 (b) 3000 (c) 30000 (d) 60000
  15. 15.Which is closest to 600 × 29? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  16. 16.Which is closest to 598 × 18? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
  17. 17.Round 34.21 to one decimal place. =
  18. 18.Round 15826 to the nearest hundred.
  19. 19.Which is closest to 502 × 58? (Round each number first.) (a) 30000 (b) 300000 (c) 60000 (d) 3000
  20. 20.Which is closest to 1208 ÷ 19? (a) 600 (b) 60 (c) 120 (d) 30
  21. 21.Which is closest to 896 × 49? (Round each number first.) (a) 90000 (b) 4500 (c) 45000 (d) 450000
  22. 22.Round 96.87 to one decimal place. =
  23. 23.Which is closest to 401 × 72? (Round each number first.) (a) 2800 (b) 56000 (c) 280000 (d) 28000
  24. 24.Which is closest to 2005 ÷ 51? (a) 80 (b) 400 (c) 20 (d) 40
  25. 25.Round 14.58 to one decimal place. =
  26. 26.Round 66.48 to one decimal place. =
  27. 27.Which is closest to 2692 ÷ 29? (a) 180 (b) 90 (c) 45 (d) 900
  28. 28.Which is closest to 1003 ÷ 51? (a) 10 (b) 200 (c) 40 (d) 20
  29. 29.Round 10703 to the nearest hundred.
  30. 30.Round 38857 to the nearest ten.
  31. 31.Round 87.94 to one decimal place. =
  32. 32.Which is closest to 201 × 92? (Round each number first.) (a) 36000 (b) 18000 (c) 180000 (d) 1800
  33. 33.Which is closest to 398 + 396 + 595? (a) 1600 (b) 1500 (c) 1400 (d) 1300
  34. 34.Which is closest to 1206 ÷ 21? (a) 60 (b) 600 (c) 30 (d) 120
  35. 35.Which is closest to 203 × 21? (Round each number first.) (a) 4000 (b) 400 (c) 40000 (d) 8000
  36. 36.Round 82.94 to one decimal place. =
  37. 37.Which is closest to 3607 ÷ 39? (a) 900 (b) 180 (c) 90 (d) 45
  38. 38.Round 24661 to the nearest ten.
  39. 39.Which is closest to 1497 ÷ 49? (a) 300 (b) 30 (c) 15 (d) 60
  40. 40.Which is closest to 901 × 28? (Round each number first.) (a) 54000 (b) 27000 (c) 270000 (d) 2700

Answer key

  1. 23.8
  2. 25600
  3. 70
  4. 30
  5. 800
  6. 1900
  7. 8000
  8. 1400
  9. 30000
  10. 60
  11. 16000
  12. 14000
  13. 70
  14. 30000
  15. 18000
  16. 12000
  17. 34.2
  18. 15800
  19. 30000
  20. 60
  21. 45000
  22. 96.9
  23. 28000
  24. 40
  25. 14.6
  26. 66.5
  27. 90
  28. 20
  29. 10700
  30. 38860
  31. 87.9
  32. 18000
  33. 1400
  34. 60
  35. 4000
  36. 82.9
  37. 90
  38. 24660
  39. 30
  40. 27000

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