← Approximation and estimation lesson New set →

Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 879 · 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 38.94 to one decimal place. =
  2. 2.Which is closest to 600 × 42? (Round each number first.) (a) 24000 (b) 240000 (c) 48000 (d) 2400
  3. 3.Round 42.91 to one decimal place. =
  4. 4.Which is closest to 295 + 103 + 297? (a) 800 (b) 600 (c) 700 (d) 900
  5. 5.Round 18872 to the nearest thousand.
  6. 6.Which is closest to 497 × 70? (Round each number first.) (a) 70000 (b) 35000 (c) 3500 (d) 350000
  7. 7.Which is closest to 603 + 799 + 799? (a) 2400 (b) 2300 (c) 2100 (d) 2200
  8. 8.Round 24.47 to one decimal place. =
  9. 9.Which is closest to 403 + 798 + 702? (a) 1800 (b) 2100 (c) 2000 (d) 1900
  10. 10.Round 95.91 to one decimal place. =
  11. 11.Round 78.29 to one decimal place. =
  12. 12.Which is closest to 701 + 98 + 404? (a) 1200 (b) 1300 (c) 1400 (d) 1100
  13. 13.Which is closest to 804 + 195 + 202? (a) 1100 (b) 1400 (c) 1200 (d) 1300
  14. 14.Which is closest to 104 + 901 + 795? (a) 1900 (b) 1700 (c) 2000 (d) 1800
  15. 15.Round 68.38 to one decimal place. =
  16. 16.Which is closest to 600 ÷ 29? (a) 40 (b) 200 (c) 10 (d) 20
  17. 17.Which is closest to 899 + 603 + 902? (a) 2600 (b) 2500 (c) 2400 (d) 2300
  18. 18.Which is closest to 799 + 301 + 202? (a) 1400 (b) 1300 (c) 1500 (d) 1200
  19. 19.Round 50.09 to one decimal place. =
  20. 20.Which is closest to 802 + 596 + 395? (a) 1800 (b) 1700 (c) 2000 (d) 1900
  21. 21.Which is closest to 1591 ÷ 21? (a) 160 (b) 40 (c) 800 (d) 80
  22. 22.Which is closest to 800 + 100 + 102? (a) 1100 (b) 900 (c) 1000 (d) 1200
  23. 23.Which is closest to 1796 ÷ 21? (a) 180 (b) 900 (c) 45 (d) 90
  24. 24.Which is closest to 896 × 32? (Round each number first.) (a) 2700 (b) 27000 (c) 54000 (d) 270000
  25. 25.Round 61.91 to one decimal place. =
  26. 26.Round 10766 to the nearest thousand.
  27. 27.Round 16073 to the nearest hundred.
  28. 28.Round 16.86 to one decimal place. =
  29. 29.Which is closest to 1398 ÷ 21? (a) 700 (b) 140 (c) 35 (d) 70
  30. 30.Which is closest to 2409 ÷ 39? (a) 600 (b) 60 (c) 120 (d) 30
  31. 31.Which is closest to 903 × 68? (Round each number first.) (a) 126000 (b) 6300 (c) 630000 (d) 63000
  32. 32.Round 45.72 to one decimal place. =
  33. 33.Round 18427 to the nearest ten.
  34. 34.Which is closest to 200 + 204 + 697? (a) 1000 (b) 1200 (c) 1300 (d) 1100
  35. 35.Round 46.59 to one decimal place. =
  36. 36.Which is closest to 603 × 59? (Round each number first.) (a) 3600 (b) 36000 (c) 72000 (d) 360000
  37. 37.Which is closest to 204 × 42? (Round each number first.) (a) 800 (b) 16000 (c) 8000 (d) 80000
  38. 38.Round 56076 to the nearest ten.
  39. 39.Which is closest to 4009 ÷ 51? (a) 160 (b) 80 (c) 800 (d) 40
  40. 40.Round 81936 to the nearest ten.

Answer key

  1. 38.9
  2. 24000
  3. 42.9
  4. 700
  5. 19000
  6. 35000
  7. 2200
  8. 24.5
  9. 1900
  10. 95.9
  11. 78.3
  12. 1200
  13. 1200
  14. 1800
  15. 68.4
  16. 20
  17. 2400
  18. 1300
  19. 50.1
  20. 1800
  21. 80
  22. 1000
  23. 90
  24. 27000
  25. 61.9
  26. 11000
  27. 16100
  28. 16.9
  29. 70
  30. 60
  31. 63000
  32. 45.7
  33. 18430
  34. 1100
  35. 46.6
  36. 36000
  37. 8000
  38. 56080
  39. 80
  40. 81940

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