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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 353 · 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 1809 ÷ 31? (a) 30 (b) 600 (c) 120 (d) 60
  2. 2.Which is closest to 402 ÷ 21? (a) 10 (b) 200 (c) 40 (d) 20
  3. 3.Which is closest to 201 × 49? (Round each number first.) (a) 100000 (b) 1000 (c) 20000 (d) 10000
  4. 4.Which is closest to 196 + 305 + 203? (a) 600 (b) 800 (c) 900 (d) 700
  5. 5.Round 48.46 to one decimal place. =
  6. 6.Which is closest to 797 × 62? (Round each number first.) (a) 48000 (b) 96000 (c) 480000 (d) 4800
  7. 7.Round 95.42 to one decimal place. =
  8. 8.Which is closest to 699 × 69? (Round each number first.) (a) 4900 (b) 49000 (c) 490000 (d) 98000
  9. 9.Which is closest to 598 + 98 + 104? (a) 1000 (b) 900 (c) 800 (d) 700
  10. 10.Round 64.94 to one decimal place. =
  11. 11.Which is closest to 201 × 89? (Round each number first.) (a) 18000 (b) 180000 (c) 36000 (d) 1800
  12. 12.Round 56678 to the nearest hundred.
  13. 13.Which is closest to 796 × 82? (Round each number first.) (a) 64000 (b) 640000 (c) 6400 (d) 128000
  14. 14.Which is closest to 1198 ÷ 29? (a) 400 (b) 20 (c) 40 (d) 80
  15. 15.Round 25513 to the nearest thousand.
  16. 16.Which is closest to 598 × 60? (Round each number first.) (a) 3600 (b) 360000 (c) 36000 (d) 72000
  17. 17.Round 14964 to the nearest hundred.
  18. 18.Round 25.94 to one decimal place. =
  19. 19.Which is closest to 1997 ÷ 51? (a) 20 (b) 80 (c) 400 (d) 40
  20. 20.Round 81486 to the nearest thousand.
  21. 21.Which is closest to 196 + 196 + 901? (a) 1300 (b) 1400 (c) 1200 (d) 1500
  22. 22.Round 23595 to the nearest thousand.
  23. 23.Round 94.24 to one decimal place. =
  24. 24.Which is closest to 1206 ÷ 21? (a) 120 (b) 60 (c) 600 (d) 30
  25. 25.Round 74333 to the nearest ten.
  26. 26.Which is closest to 203 × 89? (Round each number first.) (a) 18000 (b) 1800 (c) 36000 (d) 180000
  27. 27.Round 64.56 to one decimal place. =
  28. 28.Which is closest to 2806 ÷ 41? (a) 35 (b) 700 (c) 70 (d) 140
  29. 29.Round 90.41 to one decimal place. =
  30. 30.Which is closest to 799 × 81? (Round each number first.) (a) 128000 (b) 640000 (c) 6400 (d) 64000
  31. 31.Round 63.07 to one decimal place. =
  32. 32.Round 94865 to the nearest thousand.
  33. 33.Round 50.43 to one decimal place. =
  34. 34.Which is closest to 996 ÷ 51? (a) 40 (b) 20 (c) 10 (d) 200
  35. 35.Round 76951 to the nearest thousand.
  36. 36.Which is closest to 1799 ÷ 29? (a) 60 (b) 120 (c) 600 (d) 30
  37. 37.Which is closest to 1991 ÷ 39? (a) 100 (b) 50 (c) 25 (d) 500
  38. 38.Round 69.38 to one decimal place. =
  39. 39.Which is closest to 4006 ÷ 51? (a) 160 (b) 800 (c) 40 (d) 80
  40. 40.Which is closest to 396 + 396 + 895? (a) 1900 (b) 1700 (c) 1600 (d) 1800

Answer key

  1. 60
  2. 20
  3. 10000
  4. 700
  5. 48.5
  6. 48000
  7. 95.4
  8. 49000
  9. 800
  10. 64.9
  11. 18000
  12. 56700
  13. 64000
  14. 40
  15. 26000
  16. 36000
  17. 15000
  18. 25.9
  19. 40
  20. 81000
  21. 1300
  22. 24000
  23. 94.2
  24. 60
  25. 74330
  26. 18000
  27. 64.6
  28. 70
  29. 90.4
  30. 64000
  31. 63.1
  32. 95000
  33. 50.4
  34. 20
  35. 77000
  36. 60
  37. 50
  38. 69.4
  39. 80
  40. 1700

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