← Approximation and estimation lesson New set →

Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 891 · 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 97618 to the nearest ten.
  2. 2.Round 7512 to the nearest ten.
  3. 3.Round 18.66 to one decimal place. =
  4. 4.Round 42.18 to one decimal place. =
  5. 5.Which is closest to 800 × 21? (Round each number first.) (a) 1600 (b) 160000 (c) 32000 (d) 16000
  6. 6.Which is closest to 701 × 92? (Round each number first.) (a) 63000 (b) 126000 (c) 630000 (d) 6300
  7. 7.Round 43526 to the nearest hundred.
  8. 8.Which is closest to 2498 ÷ 51? (a) 100 (b) 25 (c) 50 (d) 500
  9. 9.Which is closest to 598 × 68? (Round each number first.) (a) 4200 (b) 42000 (c) 420000 (d) 84000
  10. 10.Which is closest to 300 + 597 + 601? (a) 1500 (b) 1700 (c) 1600 (d) 1400
  11. 11.Which is closest to 799 + 200 + 705? (a) 1900 (b) 1800 (c) 1700 (d) 1600
  12. 12.Which is closest to 609 ÷ 31? (a) 20 (b) 10 (c) 40 (d) 200
  13. 13.Round 25439 to the nearest hundred.
  14. 14.Round 72.69 to one decimal place. =
  15. 15.Which is closest to 2694 ÷ 31? (a) 90 (b) 900 (c) 45 (d) 180
  16. 16.Which is closest to 403 + 296 + 404? (a) 1100 (b) 1200 (c) 1300 (d) 1000
  17. 17.Which is closest to 100 + 403 + 100? (a) 500 (b) 600 (c) 800 (d) 700
  18. 18.Which is closest to 199 × 90? (Round each number first.) (a) 18000 (b) 180000 (c) 36000 (d) 1800
  19. 19.Which is closest to 901 × 21? (Round each number first.) (a) 180000 (b) 36000 (c) 1800 (d) 18000
  20. 20.Which is closest to 1806 ÷ 29? (a) 120 (b) 600 (c) 30 (d) 60
  21. 21.Round 53479 to the nearest thousand.
  22. 22.Round 97090 to the nearest hundred.
  23. 23.Which is closest to 304 × 30? (Round each number first.) (a) 90000 (b) 18000 (c) 900 (d) 9000
  24. 24.Round 39.81 to one decimal place. =
  25. 25.Which is closest to 895 + 595 + 598? (a) 2200 (b) 2300 (c) 2100 (d) 2000
  26. 26.Which is closest to 601 × 89? (Round each number first.) (a) 540000 (b) 108000 (c) 54000 (d) 5400
  27. 27.Which is closest to 396 × 91? (Round each number first.) (a) 360000 (b) 72000 (c) 3600 (d) 36000
  28. 28.Round 51151 to the nearest ten.
  29. 29.Which is closest to 402 × 72? (Round each number first.) (a) 2800 (b) 28000 (c) 56000 (d) 280000
  30. 30.Round 36.31 to one decimal place. =
  31. 31.Round 80.84 to one decimal place. =
  32. 32.Which is closest to 1401 ÷ 19? (a) 35 (b) 70 (c) 700 (d) 140
  33. 33.Round 58262 to the nearest thousand.
  34. 34.Which is closest to 502 × 30? (Round each number first.) (a) 150000 (b) 1500 (c) 30000 (d) 15000
  35. 35.Which is closest to 302 × 41? (Round each number first.) (a) 24000 (b) 12000 (c) 1200 (d) 120000
  36. 36.Which is closest to 497 + 303 + 302? (a) 1200 (b) 1000 (c) 1100 (d) 1300
  37. 37.Round 68.16 to one decimal place. =
  38. 38.Which is closest to 402 × 41? (Round each number first.) (a) 160000 (b) 16000 (c) 32000 (d) 1600
  39. 39.Which is closest to 297 + 305 + 299? (a) 1100 (b) 800 (c) 900 (d) 1000
  40. 40.Which is closest to 2802 ÷ 41? (a) 70 (b) 140 (c) 35 (d) 700

Answer key

  1. 97620
  2. 7510
  3. 18.7
  4. 42.2
  5. 16000
  6. 63000
  7. 43500
  8. 50
  9. 42000
  10. 1500
  11. 1700
  12. 20
  13. 25400
  14. 72.7
  15. 90
  16. 1100
  17. 600
  18. 18000
  19. 18000
  20. 60
  21. 53000
  22. 97100
  23. 9000
  24. 39.8
  25. 2100
  26. 54000
  27. 36000
  28. 51150
  29. 28000
  30. 36.3
  31. 80.8
  32. 70
  33. 58000
  34. 15000
  35. 12000
  36. 1100
  37. 68.2
  38. 16000
  39. 900
  40. 70

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