← Approximation and estimation lesson New set →

Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 352 · 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 30.08 to one decimal place. =
  2. 2.Round 68.69 to one decimal place. =
  3. 3.Which is closest to 902 + 99 + 95? (a) 1300 (b) 1000 (c) 1200 (d) 1100
  4. 4.Which is closest to 599 × 48? (Round each number first.) (a) 300000 (b) 60000 (c) 30000 (d) 3000
  5. 5.Which is closest to 203 + 297 + 401? (a) 1000 (b) 800 (c) 900 (d) 1100
  6. 6.Which is closest to 95 + 396 + 904? (a) 1500 (b) 1600 (c) 1400 (d) 1300
  7. 7.Round 92879 to the nearest hundred.
  8. 8.Round 22.11 to one decimal place. =
  9. 9.Which is closest to 98 + 303 + 595? (a) 1200 (b) 1000 (c) 1100 (d) 900
  10. 10.Which is closest to 1995 ÷ 41? (a) 100 (b) 500 (c) 25 (d) 50
  11. 11.Round 60.87 to one decimal place. =
  12. 12.Round 41.21 to one decimal place. =
  13. 13.Round 23307 to the nearest ten.
  14. 14.Round 45.23 to one decimal place. =
  15. 15.Round 69.43 to one decimal place. =
  16. 16.Which is closest to 203 × 18? (Round each number first.) (a) 4000 (b) 400 (c) 8000 (d) 40000
  17. 17.Round 29.87 to one decimal place. =
  18. 18.Round 28547 to the nearest thousand.
  19. 19.Round 58.26 to one decimal place. =
  20. 20.Round 29.09 to one decimal place. =
  21. 21.Round 82969 to the nearest thousand.
  22. 22.Which is closest to 902 + 298 + 603? (a) 1700 (b) 2000 (c) 1800 (d) 1900
  23. 23.Which is closest to 303 + 601 + 596? (a) 1600 (b) 1700 (c) 1400 (d) 1500
  24. 24.Which is closest to 700 × 29? (Round each number first.) (a) 2100 (b) 21000 (c) 42000 (d) 210000
  25. 25.Which is closest to 901 × 78? (Round each number first.) (a) 7200 (b) 72000 (c) 720000 (d) 144000
  26. 26.Round 76.08 to one decimal place. =
  27. 27.Which is closest to 699 + 395 + 700? (a) 1800 (b) 1700 (c) 1900 (d) 2000
  28. 28.Which is closest to 596 × 92? (Round each number first.) (a) 54000 (b) 5400 (c) 108000 (d) 540000
  29. 29.Which is closest to 399 × 18? (Round each number first.) (a) 80000 (b) 800 (c) 16000 (d) 8000
  30. 30.Round 55.39 to one decimal place. =
  31. 31.Which is closest to 297 × 32? (Round each number first.) (a) 900 (b) 18000 (c) 90000 (d) 9000
  32. 32.Round 88.13 to one decimal place. =
  33. 33.Which is closest to 103 + 796 + 303? (a) 1100 (b) 1200 (c) 1400 (d) 1300
  34. 34.Which is closest to 792 ÷ 39? (a) 20 (b) 200 (c) 10 (d) 40
  35. 35.Which is closest to 398 + 203 + 95? (a) 900 (b) 800 (c) 600 (d) 700
  36. 36.Which is closest to 300 × 28? (Round each number first.) (a) 90000 (b) 900 (c) 9000 (d) 18000
  37. 37.Which is closest to 4503 ÷ 49? (a) 45 (b) 90 (c) 900 (d) 180
  38. 38.Which is closest to 399 × 90? (Round each number first.) (a) 3600 (b) 360000 (c) 72000 (d) 36000
  39. 39.Round 15424 to the nearest ten.
  40. 40.Which is closest to 499 × 19? (Round each number first.) (a) 100000 (b) 10000 (c) 1000 (d) 20000

Answer key

  1. 30.1
  2. 68.7
  3. 1100
  4. 30000
  5. 900
  6. 1400
  7. 92900
  8. 22.1
  9. 1000
  10. 50
  11. 60.9
  12. 41.2
  13. 23310
  14. 45.2
  15. 69.4
  16. 4000
  17. 29.9
  18. 29000
  19. 58.3
  20. 29.1
  21. 83000
  22. 1800
  23. 1500
  24. 21000
  25. 72000
  26. 76.1
  27. 1800
  28. 54000
  29. 8000
  30. 55.4
  31. 9000
  32. 88.1
  33. 1200
  34. 20
  35. 700
  36. 9000
  37. 90
  38. 36000
  39. 15420
  40. 10000

Free quantitative aptitude lessons, practice and worksheets at talentjr.in/quantitative-aptitude