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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 122 · 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 57.59 to one decimal place. =
  2. 2.Which is closest to 2804 ÷ 41? (a) 35 (b) 140 (c) 70 (d) 700
  3. 3.Round 15.82 to one decimal place. =
  4. 4.Which is closest to 409 ÷ 19? (a) 20 (b) 10 (c) 40 (d) 200
  5. 5.Round 17280 to the nearest thousand.
  6. 6.Round 78.08 to one decimal place. =
  7. 7.Round 62974 to the nearest ten.
  8. 8.Which is closest to 2792 ÷ 39? (a) 140 (b) 70 (c) 700 (d) 35
  9. 9.Which is closest to 302 + 299 + 196? (a) 800 (b) 1000 (c) 900 (d) 700
  10. 10.Which is closest to 800 × 71? (Round each number first.) (a) 5600 (b) 560000 (c) 56000 (d) 112000
  11. 11.Which is closest to 1507 ÷ 49? (a) 30 (b) 15 (c) 300 (d) 60
  12. 12.Which is closest to 702 × 39? (Round each number first.) (a) 28000 (b) 56000 (c) 2800 (d) 280000
  13. 13.Round 37.82 to one decimal place. =
  14. 14.Which is closest to 1496 ÷ 49? (a) 60 (b) 300 (c) 15 (d) 30
  15. 15.Which is closest to 405 + 595 + 298? (a) 1500 (b) 1300 (c) 1400 (d) 1200
  16. 16.Which is closest to 696 × 21? (Round each number first.) (a) 1400 (b) 14000 (c) 140000 (d) 28000
  17. 17.Which is closest to 905 ÷ 31? (a) 30 (b) 60 (c) 300 (d) 15
  18. 18.Which is closest to 503 + 696 + 302? (a) 1700 (b) 1500 (c) 1400 (d) 1600
  19. 19.Which is closest to 602 × 90? (Round each number first.) (a) 5400 (b) 108000 (c) 54000 (d) 540000
  20. 20.Which is closest to 1609 ÷ 39? (a) 20 (b) 400 (c) 40 (d) 80
  21. 21.Round 30753 to the nearest ten.
  22. 22.Which is closest to 198 + 702 + 96? (a) 900 (b) 1000 (c) 1200 (d) 1100
  23. 23.Which is closest to 204 + 95 + 700? (a) 900 (b) 1100 (c) 1000 (d) 1200
  24. 24.Which is closest to 798 × 40? (Round each number first.) (a) 3200 (b) 32000 (c) 320000 (d) 64000
  25. 25.Which is closest to 500 + 605 + 899? (a) 2000 (b) 2100 (c) 2200 (d) 1900
  26. 26.Which is closest to 903 × 59? (Round each number first.) (a) 540000 (b) 54000 (c) 5400 (d) 108000
  27. 27.Which is closest to 798 ÷ 19? (a) 20 (b) 80 (c) 40 (d) 400
  28. 28.Which is closest to 897 + 505 + 603? (a) 2000 (b) 2200 (c) 1900 (d) 2100
  29. 29.Which is closest to 2803 ÷ 39? (a) 700 (b) 140 (c) 35 (d) 70
  30. 30.Which is closest to 795 + 96 + 103? (a) 1100 (b) 1000 (c) 900 (d) 1200
  31. 31.Round 53078 to the nearest hundred.
  32. 32.Round 51967 to the nearest hundred.
  33. 33.Round 87159 to the nearest hundred.
  34. 34.Which is closest to 904 + 304 + 295? (a) 1600 (b) 1500 (c) 1700 (d) 1400
  35. 35.Which is closest to 503 + 504 + 598? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  36. 36.Which is closest to 4008 ÷ 51? (a) 800 (b) 80 (c) 40 (d) 160
  37. 37.Which is closest to 902 × 42? (Round each number first.) (a) 72000 (b) 3600 (c) 36000 (d) 360000
  38. 38.Which is closest to 606 ÷ 19? (a) 300 (b) 15 (c) 60 (d) 30
  39. 39.Which is closest to 303 + 896 + 205? (a) 1500 (b) 1300 (c) 1600 (d) 1400
  40. 40.Round 22.52 to one decimal place. =

Answer key

  1. 57.6
  2. 70
  3. 15.8
  4. 20
  5. 17000
  6. 78.1
  7. 62970
  8. 70
  9. 800
  10. 56000
  11. 30
  12. 28000
  13. 37.8
  14. 30
  15. 1300
  16. 14000
  17. 30
  18. 1500
  19. 54000
  20. 40
  21. 30750
  22. 1000
  23. 1000
  24. 32000
  25. 2000
  26. 54000
  27. 40
  28. 2000
  29. 70
  30. 1000
  31. 53100
  32. 52000
  33. 87200
  34. 1500
  35. 1600
  36. 80
  37. 36000
  38. 30
  39. 1400
  40. 22.5

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