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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 637 · 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 896 × 22? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
  2. 2.Which is closest to 105 + 803 + 697? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  3. 3.Round 90.24 to one decimal place. =
  4. 4.Round 35.77 to one decimal place. =
  5. 5.Round 23.24 to one decimal place. =
  6. 6.Which is closest to 303 × 59? (Round each number first.) (a) 18000 (b) 1800 (c) 180000 (d) 36000
  7. 7.Which is closest to 2795 ÷ 41? (a) 35 (b) 700 (c) 140 (d) 70
  8. 8.Round 32.91 to one decimal place. =
  9. 9.Round 73.48 to one decimal place. =
  10. 10.Which is closest to 199 + 701 + 703? (a) 1700 (b) 1600 (c) 1800 (d) 1500
  11. 11.Which is closest to 496 + 395 + 104? (a) 1000 (b) 1100 (c) 900 (d) 1200
  12. 12.Round 78.23 to one decimal place. =
  13. 13.Round 42055 to the nearest hundred.
  14. 14.Round 31167 to the nearest thousand.
  15. 15.Round 49.93 to one decimal place. =
  16. 16.Which is closest to 2998 ÷ 51? (a) 60 (b) 600 (c) 120 (d) 30
  17. 17.Which is closest to 499 × 42? (Round each number first.) (a) 2000 (b) 40000 (c) 20000 (d) 200000
  18. 18.Round 45.52 to one decimal place. =
  19. 19.Which is closest to 696 + 796 + 302? (a) 1800 (b) 2000 (c) 1900 (d) 1700
  20. 20.Which is closest to 397 × 50? (Round each number first.) (a) 2000 (b) 20000 (c) 40000 (d) 200000
  21. 21.Round 20.44 to one decimal place. =
  22. 22.Which is closest to 2508 ÷ 51? (a) 100 (b) 500 (c) 25 (d) 50
  23. 23.Round 37683 to the nearest thousand.
  24. 24.Which is closest to 795 + 696 + 104? (a) 1600 (b) 1800 (c) 1500 (d) 1700
  25. 25.Round 57667 to the nearest thousand.
  26. 26.Round 95.49 to one decimal place. =
  27. 27.Round 1983 to the nearest thousand.
  28. 28.Which is closest to 805 + 96 + 300? (a) 1100 (b) 1400 (c) 1300 (d) 1200
  29. 29.Which is closest to 401 + 899 + 195? (a) 1400 (b) 1700 (c) 1600 (d) 1500
  30. 30.Round 69.79 to one decimal place. =
  31. 31.Which is closest to 993 ÷ 51? (a) 10 (b) 40 (c) 200 (d) 20
  32. 32.Which is closest to 298 × 50? (Round each number first.) (a) 30000 (b) 1500 (c) 15000 (d) 150000
  33. 33.Round 92762 to the nearest hundred.
  34. 34.Which is closest to 603 + 896 + 904? (a) 2400 (b) 2300 (c) 2600 (d) 2500
  35. 35.Round 47.61 to one decimal place. =
  36. 36.Round 9776 to the nearest thousand.
  37. 37.Which is closest to 903 × 92? (Round each number first.) (a) 81000 (b) 8100 (c) 162000 (d) 810000
  38. 38.Round 61094 to the nearest ten.
  39. 39.Which is closest to 502 + 596 + 598? (a) 1800 (b) 1600 (c) 1900 (d) 1700
  40. 40.Round 24.87 to one decimal place. =

Answer key

  1. 18000
  2. 1600
  3. 90.2
  4. 35.8
  5. 23.2
  6. 18000
  7. 70
  8. 32.9
  9. 73.5
  10. 1600
  11. 1000
  12. 78.2
  13. 42100
  14. 31000
  15. 49.9
  16. 60
  17. 20000
  18. 45.5
  19. 1800
  20. 20000
  21. 20.4
  22. 50
  23. 38000
  24. 1600
  25. 58000
  26. 95.5
  27. 2000
  28. 1200
  29. 1500
  30. 69.8
  31. 20
  32. 15000
  33. 92800
  34. 2400
  35. 47.6
  36. 10000
  37. 81000
  38. 61090
  39. 1700
  40. 24.9

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