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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 681 · 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 61.42 to one decimal place. =
  2. 2.Which is closest to 2507 ÷ 49? (a) 500 (b) 100 (c) 50 (d) 25
  3. 3.Which is closest to 1197 ÷ 19? (a) 30 (b) 60 (c) 120 (d) 600
  4. 4.Which is closest to 297 × 49? (Round each number first.) (a) 1500 (b) 30000 (c) 15000 (d) 150000
  5. 5.Which is closest to 397 × 72? (Round each number first.) (a) 56000 (b) 28000 (c) 280000 (d) 2800
  6. 6.Which is closest to 401 + 805 + 196? (a) 1500 (b) 1600 (c) 1400 (d) 1300
  7. 7.Round 3132 to the nearest ten.
  8. 8.Which is closest to 402 × 38? (Round each number first.) (a) 1600 (b) 16000 (c) 32000 (d) 160000
  9. 9.Round 20330 to the nearest thousand.
  10. 10.Which is closest to 199 × 32? (Round each number first.) (a) 600 (b) 12000 (c) 60000 (d) 6000
  11. 11.Which is closest to 903 × 42? (Round each number first.) (a) 72000 (b) 3600 (c) 360000 (d) 36000
  12. 12.Which is closest to 900 + 496 + 605? (a) 2100 (b) 1900 (c) 2200 (d) 2000
  13. 13.Which is closest to 97 + 204 + 899? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  14. 14.Which is closest to 601 ÷ 29? (a) 40 (b) 200 (c) 20 (d) 10
  15. 15.Round 49802 to the nearest hundred.
  16. 16.Which is closest to 904 + 601 + 304? (a) 1900 (b) 1700 (c) 2000 (d) 1800
  17. 17.Round 90.68 to one decimal place. =
  18. 18.Which is closest to 801 × 78? (Round each number first.) (a) 128000 (b) 6400 (c) 640000 (d) 64000
  19. 19.Which is closest to 401 + 595 + 499? (a) 1500 (b) 1700 (c) 1600 (d) 1400
  20. 20.Round 13474 to the nearest thousand.
  21. 21.Which is closest to 599 × 39? (Round each number first.) (a) 2400 (b) 24000 (c) 240000 (d) 48000
  22. 22.Round 41196 to the nearest hundred.
  23. 23.Which is closest to 198 + 500 + 404? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  24. 24.Which is closest to 303 × 81? (Round each number first.) (a) 2400 (b) 24000 (c) 48000 (d) 240000
  25. 25.Round 42634 to the nearest hundred.
  26. 26.Which is closest to 593 ÷ 31? (a) 200 (b) 10 (c) 20 (d) 40
  27. 27.Round 67729 to the nearest hundred.
  28. 28.Which is closest to 901 × 30? (Round each number first.) (a) 54000 (b) 2700 (c) 270000 (d) 27000
  29. 29.Which is closest to 905 + 400 + 96? (a) 1400 (b) 1300 (c) 1600 (d) 1500
  30. 30.Which is closest to 1196 ÷ 29? (a) 80 (b) 20 (c) 40 (d) 400
  31. 31.Which is closest to 202 × 69? (Round each number first.) (a) 140000 (b) 14000 (c) 1400 (d) 28000
  32. 32.Round 96386 to the nearest ten.
  33. 33.Which is closest to 406 ÷ 19? (a) 200 (b) 20 (c) 40 (d) 10
  34. 34.Which is closest to 401 ÷ 19? (a) 20 (b) 40 (c) 200 (d) 10
  35. 35.Which is closest to 796 × 18? (Round each number first.) (a) 32000 (b) 16000 (c) 1600 (d) 160000
  36. 36.Which is closest to 296 + 902 + 100? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  37. 37.Which is closest to 1991 ÷ 49? (a) 80 (b) 40 (c) 400 (d) 20
  38. 38.Which is closest to 602 + 304 + 497? (a) 1500 (b) 1300 (c) 1600 (d) 1400
  39. 39.Round 24266 to the nearest hundred.
  40. 40.Which is closest to 302 + 302 + 303? (a) 900 (b) 1100 (c) 800 (d) 1000

Answer key

  1. 61.4
  2. 50
  3. 60
  4. 15000
  5. 28000
  6. 1400
  7. 3130
  8. 16000
  9. 20000
  10. 6000
  11. 36000
  12. 2000
  13. 1200
  14. 20
  15. 49800
  16. 1800
  17. 90.7
  18. 64000
  19. 1500
  20. 13000
  21. 24000
  22. 41200
  23. 1100
  24. 24000
  25. 42600
  26. 20
  27. 67700
  28. 27000
  29. 1400
  30. 40
  31. 14000
  32. 96390
  33. 20
  34. 20
  35. 16000
  36. 1300
  37. 40
  38. 1400
  39. 24300
  40. 900

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