← Approximation and estimation lesson New set →

Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 999 · 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.Which is closest to 696 × 39? (Round each number first.) (a) 56000 (b) 280000 (c) 28000 (d) 2800
  2. 2.Which is closest to 305 + 297 + 601? (a) 1200 (b) 1400 (c) 1100 (d) 1300
  3. 3.Which is closest to 3600 ÷ 41? (a) 45 (b) 180 (c) 90 (d) 900
  4. 4.Which is closest to 2509 ÷ 49? (a) 500 (b) 100 (c) 25 (d) 50
  5. 5.Which is closest to 599 + 200 + 804? (a) 1600 (b) 1500 (c) 1800 (d) 1700
  6. 6.Which is closest to 302 × 72? (Round each number first.) (a) 2100 (b) 42000 (c) 21000 (d) 210000
  7. 7.Which is closest to 298 × 60? (Round each number first.) (a) 18000 (b) 1800 (c) 36000 (d) 180000
  8. 8.Round 97668 to the nearest ten.
  9. 9.Round 22.06 to one decimal place. =
  10. 10.Which is closest to 602 + 298 + 797? (a) 1900 (b) 1800 (c) 1600 (d) 1700
  11. 11.Which is closest to 702 × 51? (Round each number first.) (a) 3500 (b) 350000 (c) 35000 (d) 70000
  12. 12.Round 89.54 to one decimal place. =
  13. 13.Which is closest to 402 × 68? (Round each number first.) (a) 28000 (b) 2800 (c) 280000 (d) 56000
  14. 14.Which is closest to 304 + 900 + 204? (a) 1500 (b) 1400 (c) 1300 (d) 1600
  15. 15.Round 40288 to the nearest ten.
  16. 16.Which is closest to 300 + 697 + 405? (a) 1600 (b) 1300 (c) 1400 (d) 1500
  17. 17.Which is closest to 501 × 92? (Round each number first.) (a) 450000 (b) 4500 (c) 90000 (d) 45000
  18. 18.Which is closest to 1203 ÷ 19? (a) 60 (b) 120 (c) 600 (d) 30
  19. 19.Which is closest to 204 × 38? (Round each number first.) (a) 80000 (b) 8000 (c) 16000 (d) 800
  20. 20.Which is closest to 2394 ÷ 41? (a) 60 (b) 120 (c) 600 (d) 30
  21. 21.Which is closest to 99 + 604 + 295? (a) 900 (b) 1000 (c) 1200 (d) 1100
  22. 22.Which is closest to 897 × 80? (Round each number first.) (a) 7200 (b) 72000 (c) 720000 (d) 144000
  23. 23.Round 82.52 to one decimal place. =
  24. 24.Round 47.81 to one decimal place. =
  25. 25.Which is closest to 700 × 29? (Round each number first.) (a) 42000 (b) 210000 (c) 2100 (d) 21000
  26. 26.Round 61116 to the nearest ten.
  27. 27.Which is closest to 609 ÷ 31? (a) 200 (b) 40 (c) 20 (d) 10
  28. 28.Which is closest to 1209 ÷ 21? (a) 60 (b) 120 (c) 600 (d) 30
  29. 29.Round 40.82 to one decimal place. =
  30. 30.Round 26341 to the nearest ten.
  31. 31.Which is closest to 603 × 61? (Round each number first.) (a) 36000 (b) 3600 (c) 72000 (d) 360000
  32. 32.Which is closest to 298 × 59? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  33. 33.Which is closest to 1005 ÷ 51? (a) 20 (b) 40 (c) 200 (d) 10
  34. 34.Round 82983 to the nearest thousand.
  35. 35.Round 82992 to the nearest thousand.
  36. 36.Round 47.52 to one decimal place. =
  37. 37.Round 48.42 to one decimal place. =
  38. 38.Round 53.49 to one decimal place. =
  39. 39.Which is closest to 808 ÷ 19? (a) 400 (b) 80 (c) 40 (d) 20
  40. 40.Which is closest to 802 × 18? (Round each number first.) (a) 32000 (b) 1600 (c) 160000 (d) 16000

Answer key

  1. 28000
  2. 1200
  3. 90
  4. 50
  5. 1600
  6. 21000
  7. 18000
  8. 97670
  9. 22.1
  10. 1700
  11. 35000
  12. 89.5
  13. 28000
  14. 1400
  15. 40290
  16. 1400
  17. 45000
  18. 60
  19. 8000
  20. 60
  21. 1000
  22. 72000
  23. 82.5
  24. 47.8
  25. 21000
  26. 61120
  27. 20
  28. 60
  29. 40.8
  30. 26340
  31. 36000
  32. 18000
  33. 20
  34. 83000
  35. 83000
  36. 47.5
  37. 48.4
  38. 53.5
  39. 40
  40. 16000

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