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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 310 · 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 501 × 89? (Round each number first.) (a) 4500 (b) 45000 (c) 90000 (d) 450000
  2. 2.Which is closest to 504 + 200 + 301? (a) 1200 (b) 1100 (c) 900 (d) 1000
  3. 3.Which is closest to 1507 ÷ 49? (a) 30 (b) 300 (c) 15 (d) 60
  4. 4.Round 24.42 to one decimal place. =
  5. 5.Round 9619 to the nearest hundred.
  6. 6.Which is closest to 404 × 48? (Round each number first.) (a) 200000 (b) 2000 (c) 40000 (d) 20000
  7. 7.Round 90.73 to one decimal place. =
  8. 8.Which is closest to 196 + 304 + 496? (a) 1100 (b) 1200 (c) 900 (d) 1000
  9. 9.Which is closest to 896 × 20? (Round each number first.) (a) 1800 (b) 18000 (c) 180000 (d) 36000
  10. 10.Which is closest to 697 + 801 + 905? (a) 2600 (b) 2400 (c) 2300 (d) 2500
  11. 11.Round 67.94 to one decimal place. =
  12. 12.Round 79.73 to one decimal place. =
  13. 13.Which is closest to 598 × 90? (Round each number first.) (a) 540000 (b) 54000 (c) 108000 (d) 5400
  14. 14.Which is closest to 2008 ÷ 41? (a) 100 (b) 500 (c) 25 (d) 50
  15. 15.Round 55171 to the nearest hundred.
  16. 16.Which is closest to 2999 ÷ 49? (a) 60 (b) 600 (c) 30 (d) 120
  17. 17.Which is closest to 801 × 60? (Round each number first.) (a) 480000 (b) 96000 (c) 48000 (d) 4800
  18. 18.Round 49144 to the nearest ten.
  19. 19.Round 68.68 to one decimal place. =
  20. 20.Round 70879 to the nearest ten.
  21. 21.Which is closest to 297 × 71? (Round each number first.) (a) 21000 (b) 210000 (c) 42000 (d) 2100
  22. 22.Which is closest to 499 + 102 + 798? (a) 1600 (b) 1400 (c) 1500 (d) 1300
  23. 23.Round 13987 to the nearest hundred.
  24. 24.Round 34.74 to one decimal place. =
  25. 25.Which is closest to 695 + 302 + 498? (a) 1700 (b) 1600 (c) 1500 (d) 1400
  26. 26.Round 86.57 to one decimal place. =
  27. 27.Which is closest to 597 × 48? (Round each number first.) (a) 3000 (b) 300000 (c) 30000 (d) 60000
  28. 28.Round 86.93 to one decimal place. =
  29. 29.Round 41.14 to one decimal place. =
  30. 30.Round 95.62 to one decimal place. =
  31. 31.Round 36619 to the nearest thousand.
  32. 32.Which is closest to 399 + 804 + 96? (a) 1300 (b) 1200 (c) 1400 (d) 1500
  33. 33.Which is closest to 896 + 395 + 395? (a) 1700 (b) 1800 (c) 1900 (d) 1600
  34. 34.Which is closest to 104 + 702 + 696? (a) 1400 (b) 1500 (c) 1600 (d) 1700
  35. 35.Which is closest to 795 + 705 + 796? (a) 2300 (b) 2400 (c) 2200 (d) 2500
  36. 36.Which is closest to 4498 ÷ 49? (a) 90 (b) 900 (c) 180 (d) 45
  37. 37.Round 44.18 to one decimal place. =
  38. 38.Round 81240 to the nearest hundred.
  39. 39.Round 51.42 to one decimal place. =
  40. 40.Which is closest to 305 + 398 + 603? (a) 1300 (b) 1200 (c) 1400 (d) 1500

Answer key

  1. 45000
  2. 1000
  3. 30
  4. 24.4
  5. 9600
  6. 20000
  7. 90.7
  8. 1000
  9. 18000
  10. 2400
  11. 67.9
  12. 79.7
  13. 54000
  14. 50
  15. 55200
  16. 60
  17. 48000
  18. 49140
  19. 68.7
  20. 70880
  21. 21000
  22. 1400
  23. 14000
  24. 34.7
  25. 1500
  26. 86.6
  27. 30000
  28. 86.9
  29. 41.1
  30. 95.6
  31. 37000
  32. 1300
  33. 1700
  34. 1500
  35. 2300
  36. 90
  37. 44.2
  38. 81200
  39. 51.4
  40. 1300

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