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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 294 · 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 1409 ÷ 21? (a) 140 (b) 70 (c) 700 (d) 35
  2. 2.Which is closest to 498 + 100 + 904? (a) 1600 (b) 1700 (c) 1500 (d) 1400
  3. 3.Which is closest to 1995 ÷ 41? (a) 100 (b) 50 (c) 500 (d) 25
  4. 4.Which is closest to 2503 ÷ 51? (a) 100 (b) 500 (c) 25 (d) 50
  5. 5.Round 66252 to the nearest hundred.
  6. 6.Which is closest to 205 + 295 + 705? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  7. 7.Round 63.22 to one decimal place. =
  8. 8.Which is closest to 197 × 51? (Round each number first.) (a) 20000 (b) 10000 (c) 1000 (d) 100000
  9. 9.Which is closest to 1505 ÷ 31? (a) 50 (b) 25 (c) 100 (d) 500
  10. 10.Which is closest to 899 × 39? (Round each number first.) (a) 360000 (b) 3600 (c) 36000 (d) 72000
  11. 11.Round 28.44 to one decimal place. =
  12. 12.Which is closest to 4501 ÷ 51? (a) 180 (b) 45 (c) 90 (d) 900
  13. 13.Which is closest to 599 + 503 + 596? (a) 1900 (b) 1600 (c) 1700 (d) 1800
  14. 14.Round 21742 to the nearest ten.
  15. 15.Round 1810 to the nearest thousand.
  16. 16.Round 41488 to the nearest ten.
  17. 17.Which is closest to 2791 ÷ 41? (a) 700 (b) 140 (c) 70 (d) 35
  18. 18.Round 12.13 to one decimal place. =
  19. 19.Which is closest to 196 + 704 + 904? (a) 1700 (b) 1900 (c) 2000 (d) 1800
  20. 20.Which is closest to 301 + 801 + 102? (a) 1400 (b) 1100 (c) 1300 (d) 1200
  21. 21.Which is closest to 598 × 28? (Round each number first.) (a) 1800 (b) 18000 (c) 36000 (d) 180000
  22. 22.Which is closest to 804 + 595 + 796? (a) 2300 (b) 2100 (c) 2200 (d) 2400
  23. 23.Which is closest to 98 + 300 + 696? (a) 1000 (b) 1200 (c) 1300 (d) 1100
  24. 24.Which is closest to 899 + 95 + 96? (a) 1300 (b) 1200 (c) 1000 (d) 1100
  25. 25.Which is closest to 1207 ÷ 31? (a) 80 (b) 40 (c) 20 (d) 400
  26. 26.Which is closest to 98 + 902 + 502? (a) 1500 (b) 1700 (c) 1400 (d) 1600
  27. 27.Round 39085 to the nearest hundred.
  28. 28.Round 24.81 to one decimal place. =
  29. 29.Round 44.42 to one decimal place. =
  30. 30.Which is closest to 699 × 49? (Round each number first.) (a) 350000 (b) 70000 (c) 3500 (d) 35000
  31. 31.Which is closest to 201 × 28? (Round each number first.) (a) 60000 (b) 12000 (c) 600 (d) 6000
  32. 32.Which is closest to 1509 ÷ 29? (a) 25 (b) 500 (c) 50 (d) 100
  33. 33.Round 98.77 to one decimal place. =
  34. 34.Round 98.16 to one decimal place. =
  35. 35.Round 68.24 to one decimal place. =
  36. 36.Which is closest to 905 + 202 + 596? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  37. 37.Round 24.57 to one decimal place. =
  38. 38.Which is closest to 496 + 897 + 503? (a) 1900 (b) 1800 (c) 2000 (d) 2100
  39. 39.Which is closest to 401 × 49? (Round each number first.) (a) 20000 (b) 2000 (c) 40000 (d) 200000
  40. 40.Round 36.36 to one decimal place. =

Answer key

  1. 70
  2. 1500
  3. 50
  4. 50
  5. 66300
  6. 1200
  7. 63.2
  8. 10000
  9. 50
  10. 36000
  11. 28.4
  12. 90
  13. 1700
  14. 21740
  15. 2000
  16. 41490
  17. 70
  18. 12.1
  19. 1800
  20. 1200
  21. 18000
  22. 2200
  23. 1100
  24. 1100
  25. 40
  26. 1500
  27. 39100
  28. 24.8
  29. 44.4
  30. 35000
  31. 6000
  32. 50
  33. 98.8
  34. 98.2
  35. 68.2
  36. 1700
  37. 24.6
  38. 1900
  39. 20000
  40. 36.4

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