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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 297 · 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 77.18 to one decimal place. =
  2. 2.Which is closest to 3601 ÷ 41? (a) 45 (b) 900 (c) 180 (d) 90
  3. 3.Which is closest to 3005 ÷ 49? (a) 30 (b) 600 (c) 60 (d) 120
  4. 4.Which is closest to 498 × 72? (Round each number first.) (a) 35000 (b) 350000 (c) 70000 (d) 3500
  5. 5.Round 28881 to the nearest ten.
  6. 6.Round 27.84 to one decimal place. =
  7. 7.Which is closest to 503 × 31? (Round each number first.) (a) 30000 (b) 150000 (c) 15000 (d) 1500
  8. 8.Which is closest to 804 ÷ 21? (a) 80 (b) 400 (c) 20 (d) 40
  9. 9.Which is closest to 1591 ÷ 41? (a) 20 (b) 40 (c) 80 (d) 400
  10. 10.Which is closest to 702 + 601 + 903? (a) 2200 (b) 2100 (c) 2400 (d) 2300
  11. 11.Round 62617 to the nearest hundred.
  12. 12.Which is closest to 196 × 59? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  13. 13.Which is closest to 197 × 62? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  14. 14.Which is closest to 1997 ÷ 51? (a) 20 (b) 80 (c) 40 (d) 400
  15. 15.Which is closest to 204 × 48? (Round each number first.) (a) 100000 (b) 20000 (c) 10000 (d) 1000
  16. 16.Which is closest to 2409 ÷ 39? (a) 600 (b) 120 (c) 30 (d) 60
  17. 17.Round 90.24 to one decimal place. =
  18. 18.Which is closest to 897 × 61? (Round each number first.) (a) 540000 (b) 5400 (c) 54000 (d) 108000
  19. 19.Which is closest to 3006 ÷ 49? (a) 30 (b) 600 (c) 120 (d) 60
  20. 20.Round 39581 to the nearest ten.
  21. 21.Round 48.67 to one decimal place. =
  22. 22.Which is closest to 504 + 899 + 402? (a) 1700 (b) 1800 (c) 1900 (d) 2000
  23. 23.Round 98652 to the nearest thousand.
  24. 24.Round 23.88 to one decimal place. =
  25. 25.Which is closest to 697 + 902 + 498? (a) 2200 (b) 2300 (c) 2000 (d) 2100
  26. 26.Which is closest to 696 × 22? (Round each number first.) (a) 14000 (b) 28000 (c) 140000 (d) 1400
  27. 27.Which is closest to 803 + 196 + 399? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  28. 28.Round 81388 to the nearest hundred.
  29. 29.Which is closest to 498 × 30? (Round each number first.) (a) 1500 (b) 150000 (c) 30000 (d) 15000
  30. 30.Round 24679 to the nearest hundred.
  31. 31.Round 2633 to the nearest ten.
  32. 32.Which is closest to 897 + 602 + 898? (a) 2400 (b) 2300 (c) 2500 (d) 2600
  33. 33.Round 36780 to the nearest thousand.
  34. 34.Which is closest to 2797 ÷ 39? (a) 700 (b) 35 (c) 140 (d) 70
  35. 35.Which is closest to 1194 ÷ 31? (a) 400 (b) 40 (c) 20 (d) 80
  36. 36.Which is closest to 704 + 802 + 904? (a) 2600 (b) 2400 (c) 2500 (d) 2300
  37. 37.Which is closest to 2506 ÷ 51? (a) 25 (b) 500 (c) 50 (d) 100
  38. 38.Which is closest to 804 ÷ 19? (a) 400 (b) 80 (c) 40 (d) 20
  39. 39.Which is closest to 396 × 42? (Round each number first.) (a) 32000 (b) 1600 (c) 16000 (d) 160000
  40. 40.Round 75.84 to one decimal place. =

Answer key

  1. 77.2
  2. 90
  3. 60
  4. 35000
  5. 28880
  6. 27.8
  7. 15000
  8. 40
  9. 40
  10. 2200
  11. 62600
  12. 12000
  13. 12000
  14. 40
  15. 10000
  16. 60
  17. 90.2
  18. 54000
  19. 60
  20. 39580
  21. 48.7
  22. 1800
  23. 99000
  24. 23.9
  25. 2100
  26. 14000
  27. 1400
  28. 81400
  29. 15000
  30. 24700
  31. 2630
  32. 2400
  33. 37000
  34. 70
  35. 40
  36. 2400
  37. 50
  38. 40
  39. 16000
  40. 75.8

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