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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 66 · 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 19147 to the nearest hundred.
  2. 2.Round 99.94 to one decimal place. =
  3. 3.Which is closest to 498 × 41? (Round each number first.) (a) 40000 (b) 20000 (c) 2000 (d) 200000
  4. 4.Which is closest to 405 + 596 + 896? (a) 2100 (b) 2000 (c) 1800 (d) 1900
  5. 5.Which is closest to 397 ÷ 21? (a) 10 (b) 200 (c) 40 (d) 20
  6. 6.Round 35.06 to one decimal place. =
  7. 7.Round 57.43 to one decimal place. =
  8. 8.Round 22893 to the nearest thousand.
  9. 9.Which is closest to 499 × 61? (Round each number first.) (a) 300000 (b) 30000 (c) 60000 (d) 3000
  10. 10.Which is closest to 104 + 305 + 599? (a) 1100 (b) 900 (c) 1200 (d) 1000
  11. 11.Which is closest to 400 × 38? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
  12. 12.Which is closest to 500 + 197 + 605? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  13. 13.Round 60119 to the nearest ten.
  14. 14.Which is closest to 298 + 396 + 905? (a) 1700 (b) 1800 (c) 1600 (d) 1500
  15. 15.Which is closest to 502 + 603 + 200? (a) 1200 (b) 1300 (c) 1400 (d) 1500
  16. 16.Round 43.43 to one decimal place. =
  17. 17.Which is closest to 699 × 32? (Round each number first.) (a) 42000 (b) 21000 (c) 2100 (d) 210000
  18. 18.Round 62.53 to one decimal place. =
  19. 19.Which is closest to 700 + 697 + 598? (a) 1900 (b) 2000 (c) 2200 (d) 2100
  20. 20.Round 66311 to the nearest thousand.
  21. 21.Which is closest to 797 × 31? (Round each number first.) (a) 24000 (b) 2400 (c) 240000 (d) 48000
  22. 22.Round 22.27 to one decimal place. =
  23. 23.Which is closest to 2399 ÷ 31? (a) 80 (b) 40 (c) 800 (d) 160
  24. 24.Which is closest to 301 × 38? (Round each number first.) (a) 120000 (b) 12000 (c) 24000 (d) 1200
  25. 25.Which is closest to 396 ÷ 19? (a) 20 (b) 40 (c) 200 (d) 10
  26. 26.Which is closest to 600 × 28? (Round each number first.) (a) 36000 (b) 18000 (c) 1800 (d) 180000
  27. 27.Which is closest to 400 × 19? (Round each number first.) (a) 800 (b) 16000 (c) 8000 (d) 80000
  28. 28.Which is closest to 1803 ÷ 29? (a) 30 (b) 60 (c) 600 (d) 120
  29. 29.Round 56.06 to one decimal place. =
  30. 30.Round 18.47 to one decimal place. =
  31. 31.Which is closest to 797 × 50? (Round each number first.) (a) 80000 (b) 400000 (c) 4000 (d) 40000
  32. 32.Which is closest to 298 × 92? (Round each number first.) (a) 27000 (b) 270000 (c) 54000 (d) 2700
  33. 33.Round 16.77 to one decimal place. =
  34. 34.Which is closest to 802 + 399 + 197? (a) 1400 (b) 1600 (c) 1500 (d) 1300
  35. 35.Which is closest to 3008 ÷ 49? (a) 60 (b) 30 (c) 600 (d) 120
  36. 36.Round 33.87 to one decimal place. =
  37. 37.Which is closest to 403 + 905 + 101? (a) 1500 (b) 1600 (c) 1300 (d) 1400
  38. 38.Round 91.23 to one decimal place. =
  39. 39.Which is closest to 1607 ÷ 19? (a) 160 (b) 40 (c) 80 (d) 800
  40. 40.Which is closest to 601 + 504 + 903? (a) 2100 (b) 2200 (c) 1900 (d) 2000

Answer key

  1. 19100
  2. 99.9
  3. 20000
  4. 1900
  5. 20
  6. 35.1
  7. 57.4
  8. 23000
  9. 30000
  10. 1000
  11. 16000
  12. 1300
  13. 60120
  14. 1600
  15. 1300
  16. 43.4
  17. 21000
  18. 62.5
  19. 2000
  20. 66000
  21. 24000
  22. 22.3
  23. 80
  24. 12000
  25. 20
  26. 18000
  27. 8000
  28. 60
  29. 56.1
  30. 18.5
  31. 40000
  32. 27000
  33. 16.8
  34. 1400
  35. 60
  36. 33.9
  37. 1400
  38. 91.2
  39. 80
  40. 2000

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