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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 163 · 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 31.12 to one decimal place. =
  2. 2.Which is closest to 599 × 91? (Round each number first.) (a) 108000 (b) 540000 (c) 5400 (d) 54000
  3. 3.Which is closest to 396 × 68? (Round each number first.) (a) 28000 (b) 56000 (c) 280000 (d) 2800
  4. 4.Which is closest to 202 × 91? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  5. 5.Round 44151 to the nearest hundred.
  6. 6.Which is closest to 903 + 103 + 797? (a) 2000 (b) 1900 (c) 1800 (d) 1700
  7. 7.Which is closest to 1497 ÷ 51? (a) 15 (b) 30 (c) 60 (d) 300
  8. 8.Which is closest to 200 × 49? (Round each number first.) (a) 20000 (b) 100000 (c) 1000 (d) 10000
  9. 9.Which is closest to 196 + 803 + 395? (a) 1400 (b) 1500 (c) 1300 (d) 1600
  10. 10.Round 31.92 to one decimal place. =
  11. 11.Round 50.23 to one decimal place. =
  12. 12.Round 18.16 to one decimal place. =
  13. 13.Which is closest to 697 + 103 + 301? (a) 1100 (b) 1300 (c) 1200 (d) 1000
  14. 14.Round 12.66 to one decimal place. =
  15. 15.Which is closest to 801 × 38? (Round each number first.) (a) 3200 (b) 32000 (c) 64000 (d) 320000
  16. 16.Round 19.67 to one decimal place. =
  17. 17.Which is closest to 598 × 21? (Round each number first.) (a) 24000 (b) 120000 (c) 1200 (d) 12000
  18. 18.Round 20.36 to one decimal place. =
  19. 19.Which is closest to 602 × 71? (Round each number first.) (a) 4200 (b) 42000 (c) 84000 (d) 420000
  20. 20.Round 27463 to the nearest thousand.
  21. 21.Which is closest to 397 + 404 + 100? (a) 800 (b) 900 (c) 1100 (d) 1000
  22. 22.Which is closest to 204 × 88? (Round each number first.) (a) 18000 (b) 36000 (c) 180000 (d) 1800
  23. 23.Round 55.86 to one decimal place. =
  24. 24.Round 65.81 to one decimal place. =
  25. 25.Round 39.19 to one decimal place. =
  26. 26.Which is closest to 498 × 41? (Round each number first.) (a) 200000 (b) 20000 (c) 2000 (d) 40000
  27. 27.Round 6154 to the nearest thousand.
  28. 28.Which is closest to 196 × 48? (Round each number first.) (a) 10000 (b) 20000 (c) 1000 (d) 100000
  29. 29.Which is closest to 199 + 898 + 404? (a) 1700 (b) 1600 (c) 1400 (d) 1500
  30. 30.Which is closest to 300 + 302 + 898? (a) 1500 (b) 1600 (c) 1700 (d) 1400
  31. 31.Round 84.08 to one decimal place. =
  32. 32.Which is closest to 298 + 695 + 799? (a) 1800 (b) 2000 (c) 1900 (d) 1700
  33. 33.Round 51857 to the nearest hundred.
  34. 34.Which is closest to 806 ÷ 39? (a) 20 (b) 200 (c) 10 (d) 40
  35. 35.Round 46777 to the nearest thousand.
  36. 36.Which is closest to 800 × 58? (Round each number first.) (a) 480000 (b) 4800 (c) 48000 (d) 96000
  37. 37.Which is closest to 495 + 303 + 800? (a) 1500 (b) 1700 (c) 1800 (d) 1600
  38. 38.Which is closest to 497 × 39? (Round each number first.) (a) 40000 (b) 200000 (c) 2000 (d) 20000
  39. 39.Round 42470 to the nearest hundred.
  40. 40.Which is closest to 197 + 800 + 101? (a) 1000 (b) 1200 (c) 1100 (d) 1300

Answer key

  1. 31.1
  2. 54000
  3. 28000
  4. 18000
  5. 44200
  6. 1800
  7. 30
  8. 10000
  9. 1400
  10. 31.9
  11. 50.2
  12. 18.2
  13. 1100
  14. 12.7
  15. 32000
  16. 19.7
  17. 12000
  18. 20.4
  19. 42000
  20. 27000
  21. 900
  22. 18000
  23. 55.9
  24. 65.8
  25. 39.2
  26. 20000
  27. 6000
  28. 10000
  29. 1500
  30. 1500
  31. 84.1
  32. 1800
  33. 51900
  34. 20
  35. 47000
  36. 48000
  37. 1600
  38. 20000
  39. 42500
  40. 1100

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