← Approximation and estimation lesson New set →

Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 312 · 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 73.82 to one decimal place. =
  2. 2.Which is closest to 101 + 197 + 200? (a) 400 (b) 500 (c) 700 (d) 600
  3. 3.Which is closest to 601 + 101 + 604? (a) 1200 (b) 1300 (c) 1500 (d) 1400
  4. 4.Which is closest to 1797 ÷ 21? (a) 45 (b) 900 (c) 90 (d) 180
  5. 5.Which is closest to 2001 ÷ 49? (a) 400 (b) 20 (c) 80 (d) 40
  6. 6.Round 17.78 to one decimal place. =
  7. 7.Round 64.43 to one decimal place. =
  8. 8.Which is closest to 392 ÷ 21? (a) 200 (b) 20 (c) 10 (d) 40
  9. 9.Which is closest to 898 + 603 + 401? (a) 2100 (b) 1800 (c) 2000 (d) 1900
  10. 10.Which is closest to 2404 ÷ 31? (a) 160 (b) 40 (c) 800 (d) 80
  11. 11.Which is closest to 600 ÷ 29? (a) 40 (b) 10 (c) 200 (d) 20
  12. 12.Which is closest to 502 × 59? (Round each number first.) (a) 3000 (b) 30000 (c) 60000 (d) 300000
  13. 13.Round 28768 to the nearest thousand.
  14. 14.Which is closest to 2397 ÷ 41? (a) 120 (b) 60 (c) 600 (d) 30
  15. 15.Round 87777 to the nearest ten.
  16. 16.Round 54678 to the nearest ten.
  17. 17.Which is closest to 898 × 21? (Round each number first.) (a) 1800 (b) 18000 (c) 180000 (d) 36000
  18. 18.Which is closest to 603 × 82? (Round each number first.) (a) 96000 (b) 48000 (c) 480000 (d) 4800
  19. 19.Which is closest to 398 × 30? (Round each number first.) (a) 24000 (b) 12000 (c) 1200 (d) 120000
  20. 20.Round 19628 to the nearest ten.
  21. 21.Round 84.54 to one decimal place. =
  22. 22.Round 73.27 to one decimal place. =
  23. 23.Round 75462 to the nearest hundred.
  24. 24.Round 13.46 to one decimal place. =
  25. 25.Which is closest to 606 ÷ 21? (a) 30 (b) 15 (c) 300 (d) 60
  26. 26.Round 86.21 to one decimal place. =
  27. 27.Round 2718 to the nearest ten.
  28. 28.Which is closest to 896 × 69? (Round each number first.) (a) 6300 (b) 63000 (c) 630000 (d) 126000
  29. 29.Round 59053 to the nearest thousand.
  30. 30.Which is closest to 594 ÷ 31? (a) 40 (b) 200 (c) 20 (d) 10
  31. 31.Which is closest to 702 × 39? (Round each number first.) (a) 280000 (b) 2800 (c) 56000 (d) 28000
  32. 32.Round 36939 to the nearest hundred.
  33. 33.Round 4247 to the nearest hundred.
  34. 34.Which is closest to 602 ÷ 21? (a) 30 (b) 300 (c) 60 (d) 15
  35. 35.Which is closest to 2999 ÷ 49? (a) 120 (b) 60 (c) 600 (d) 30
  36. 36.Which is closest to 604 × 19? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  37. 37.Which is closest to 302 + 704 + 503? (a) 1500 (b) 1600 (c) 1700 (d) 1400
  38. 38.Which is closest to 103 + 100 + 300? (a) 600 (b) 500 (c) 700 (d) 400
  39. 39.Which is closest to 3506 ÷ 49? (a) 35 (b) 700 (c) 70 (d) 140
  40. 40.Which is closest to 602 × 90? (Round each number first.) (a) 108000 (b) 540000 (c) 54000 (d) 5400

Answer key

  1. 73.8
  2. 500
  3. 1300
  4. 90
  5. 40
  6. 17.8
  7. 64.4
  8. 20
  9. 1900
  10. 80
  11. 20
  12. 30000
  13. 29000
  14. 60
  15. 87780
  16. 54680
  17. 18000
  18. 48000
  19. 12000
  20. 19630
  21. 84.5
  22. 73.3
  23. 75500
  24. 13.5
  25. 30
  26. 86.2
  27. 2720
  28. 63000
  29. 59000
  30. 20
  31. 28000
  32. 36900
  33. 4200
  34. 30
  35. 60
  36. 12000
  37. 1500
  38. 500
  39. 70
  40. 54000

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