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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 18 · 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 298 × 28? (Round each number first.) (a) 9000 (b) 90000 (c) 900 (d) 18000
  2. 2.Which is closest to 1797 ÷ 21? (a) 900 (b) 180 (c) 45 (d) 90
  3. 3.Round 69.58 to one decimal place. =
  4. 4.Round 90793 to the nearest hundred.
  5. 5.Which is closest to 1800 ÷ 31? (a) 600 (b) 120 (c) 60 (d) 30
  6. 6.Which is closest to 1502 ÷ 51? (a) 60 (b) 30 (c) 15 (d) 300
  7. 7.Which is closest to 697 + 798 + 598? (a) 2000 (b) 2200 (c) 2100 (d) 2300
  8. 8.Which is closest to 2409 ÷ 39? (a) 600 (b) 120 (c) 60 (d) 30
  9. 9.Which is closest to 699 × 58? (Round each number first.) (a) 4200 (b) 42000 (c) 420000 (d) 84000
  10. 10.Which is closest to 2709 ÷ 31? (a) 45 (b) 180 (c) 90 (d) 900
  11. 11.Which is closest to 896 + 305 + 102? (a) 1200 (b) 1300 (c) 1400 (d) 1500
  12. 12.Which is closest to 803 × 82? (Round each number first.) (a) 640000 (b) 64000 (c) 6400 (d) 128000
  13. 13.Round 77.07 to one decimal place. =
  14. 14.Which is closest to 598 + 705 + 197? (a) 1600 (b) 1700 (c) 1400 (d) 1500
  15. 15.Which is closest to 499 × 28? (Round each number first.) (a) 1500 (b) 150000 (c) 30000 (d) 15000
  16. 16.Round 14.13 to one decimal place. =
  17. 17.Which is closest to 498 + 897 + 196? (a) 1500 (b) 1700 (c) 1800 (d) 1600
  18. 18.Which is closest to 405 + 295 + 196? (a) 1100 (b) 800 (c) 1000 (d) 900
  19. 19.Round 50227 to the nearest thousand.
  20. 20.Round 71207 to the nearest hundred.
  21. 21.Round 76248 to the nearest thousand.
  22. 22.Which is closest to 601 + 496 + 602? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  23. 23.Round 28.64 to one decimal place. =
  24. 24.Which is closest to 804 × 92? (Round each number first.) (a) 720000 (b) 144000 (c) 7200 (d) 72000
  25. 25.Round 69710 to the nearest hundred.
  26. 26.Which is closest to 2391 ÷ 39? (a) 120 (b) 30 (c) 60 (d) 600
  27. 27.Which is closest to 697 + 895 + 695? (a) 2500 (b) 2300 (c) 2400 (d) 2200
  28. 28.Which is closest to 1801 ÷ 29? (a) 30 (b) 120 (c) 600 (d) 60
  29. 29.Which is closest to 795 ÷ 21? (a) 40 (b) 400 (c) 80 (d) 20
  30. 30.Which is closest to 701 + 103 + 99? (a) 800 (b) 1100 (c) 1000 (d) 900
  31. 31.Which is closest to 4509 ÷ 49? (a) 90 (b) 180 (c) 45 (d) 900
  32. 32.Which is closest to 697 + 598 + 704? (a) 2000 (b) 2100 (c) 2200 (d) 1900
  33. 33.Round 7310 to the nearest thousand.
  34. 34.Round 90774 to the nearest hundred.
  35. 35.Round 25.86 to one decimal place. =
  36. 36.Round 67594 to the nearest thousand.
  37. 37.Which is closest to 396 × 28? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  38. 38.Which is closest to 1006 ÷ 21? (a) 25 (b) 50 (c) 100 (d) 500
  39. 39.Which is closest to 899 × 40? (Round each number first.) (a) 3600 (b) 72000 (c) 36000 (d) 360000
  40. 40.Which is closest to 697 × 59? (Round each number first.) (a) 420000 (b) 84000 (c) 4200 (d) 42000

Answer key

  1. 9000
  2. 90
  3. 69.6
  4. 90800
  5. 60
  6. 30
  7. 2100
  8. 60
  9. 42000
  10. 90
  11. 1300
  12. 64000
  13. 77.1
  14. 1500
  15. 15000
  16. 14.1
  17. 1600
  18. 900
  19. 50000
  20. 71200
  21. 76000
  22. 1700
  23. 28.6
  24. 72000
  25. 69700
  26. 60
  27. 2300
  28. 60
  29. 40
  30. 900
  31. 90
  32. 2000
  33. 7000
  34. 90800
  35. 25.9
  36. 68000
  37. 12000
  38. 50
  39. 36000
  40. 42000

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