← Approximation and estimation lesson New set →

Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 95 · 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 8684 to the nearest hundred.
  2. 2.Which is closest to 399 + 195 + 596? (a) 1400 (b) 1300 (c) 1100 (d) 1200
  3. 3.Round 72993 to the nearest hundred.
  4. 4.Which is closest to 397 × 48? (Round each number first.) (a) 20000 (b) 40000 (c) 200000 (d) 2000
  5. 5.Which is closest to 402 × 18? (Round each number first.) (a) 16000 (b) 80000 (c) 800 (d) 8000
  6. 6.Which is closest to 503 + 200 + 600? (a) 1300 (b) 1400 (c) 1500 (d) 1200
  7. 7.Which is closest to 703 + 403 + 696? (a) 1700 (b) 1900 (c) 2000 (d) 1800
  8. 8.Which is closest to 799 + 602 + 303? (a) 1800 (b) 1600 (c) 1900 (d) 1700
  9. 9.Round 90.86 to one decimal place. =
  10. 10.Round 41.16 to one decimal place. =
  11. 11.Which is closest to 904 × 20? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  12. 12.Round 23741 to the nearest thousand.
  13. 13.Which is closest to 696 × 50? (Round each number first.) (a) 70000 (b) 350000 (c) 3500 (d) 35000
  14. 14.Round 47.94 to one decimal place. =
  15. 15.Which is closest to 896 × 39? (Round each number first.) (a) 360000 (b) 36000 (c) 72000 (d) 3600
  16. 16.Round 73.89 to one decimal place. =
  17. 17.Round 24153 to the nearest thousand.
  18. 18.Round 32317 to the nearest hundred.
  19. 19.Round 37154 to the nearest thousand.
  20. 20.Which is closest to 1605 ÷ 39? (a) 80 (b) 40 (c) 20 (d) 400
  21. 21.Round 39.53 to one decimal place. =
  22. 22.Which is closest to 403 × 29? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
  23. 23.Which is closest to 196 × 49? (Round each number first.) (a) 20000 (b) 100000 (c) 1000 (d) 10000
  24. 24.Which is closest to 805 + 404 + 896? (a) 2100 (b) 2200 (c) 2300 (d) 2000
  25. 25.Round 17053 to the nearest ten.
  26. 26.Round 47957 to the nearest hundred.
  27. 27.Round 78.54 to one decimal place. =
  28. 28.Round 67773 to the nearest ten.
  29. 29.Which is closest to 796 × 52? (Round each number first.) (a) 400000 (b) 4000 (c) 40000 (d) 80000
  30. 30.Which is closest to 597 + 799 + 298? (a) 1700 (b) 1900 (c) 1600 (d) 1800
  31. 31.Which is closest to 303 × 20? (Round each number first.) (a) 12000 (b) 6000 (c) 600 (d) 60000
  32. 32.Round 24.42 to one decimal place. =
  33. 33.Which is closest to 993 ÷ 21? (a) 50 (b) 25 (c) 100 (d) 500
  34. 34.Which is closest to 1493 ÷ 29? (a) 25 (b) 50 (c) 500 (d) 100
  35. 35.Which is closest to 1209 ÷ 21? (a) 30 (b) 60 (c) 600 (d) 120
  36. 36.Which is closest to 504 × 62? (Round each number first.) (a) 3000 (b) 30000 (c) 60000 (d) 300000
  37. 37.Round 75.29 to one decimal place. =
  38. 38.Which is closest to 100 + 500 + 96? (a) 700 (b) 600 (c) 800 (d) 900
  39. 39.Round 58.53 to one decimal place. =
  40. 40.Which is closest to 598 + 801 + 595? (a) 2200 (b) 2000 (c) 2100 (d) 1900

Answer key

  1. 8700
  2. 1200
  3. 73000
  4. 20000
  5. 8000
  6. 1300
  7. 1800
  8. 1700
  9. 90.9
  10. 41.2
  11. 18000
  12. 24000
  13. 35000
  14. 47.9
  15. 36000
  16. 73.9
  17. 24000
  18. 32300
  19. 37000
  20. 40
  21. 39.5
  22. 12000
  23. 10000
  24. 2100
  25. 17050
  26. 48000
  27. 78.5
  28. 67770
  29. 40000
  30. 1700
  31. 6000
  32. 24.4
  33. 50
  34. 50
  35. 60
  36. 30000
  37. 75.3
  38. 700
  39. 58.5
  40. 2000

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