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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 403 · 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 495 + 905 + 404? (a) 1900 (b) 1700 (c) 2000 (d) 1800
  2. 2.Which is closest to 96 + 95 + 102? (a) 500 (b) 200 (c) 300 (d) 400
  3. 3.Which is closest to 3501 ÷ 51? (a) 70 (b) 35 (c) 140 (d) 700
  4. 4.Which is closest to 196 × 51? (Round each number first.) (a) 20000 (b) 1000 (c) 10000 (d) 100000
  5. 5.Round 10.48 to one decimal place. =
  6. 6.Which is closest to 599 × 19? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  7. 7.Which is closest to 404 × 60? (Round each number first.) (a) 24000 (b) 48000 (c) 2400 (d) 240000
  8. 8.Round 54.42 to one decimal place. =
  9. 9.Which is closest to 698 + 301 + 496? (a) 1400 (b) 1700 (c) 1600 (d) 1500
  10. 10.Which is closest to 199 + 505 + 900? (a) 1500 (b) 1800 (c) 1700 (d) 1600
  11. 11.Round 39.39 to one decimal place. =
  12. 12.Which is closest to 402 + 397 + 899? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  13. 13.Round 12.31 to one decimal place. =
  14. 14.Round 19.84 to one decimal place. =
  15. 15.Which is closest to 397 ÷ 21? (a) 40 (b) 10 (c) 20 (d) 200
  16. 16.Round 21242 to the nearest ten.
  17. 17.Which is closest to 398 + 500 + 702? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  18. 18.Which is closest to 1504 ÷ 29? (a) 100 (b) 50 (c) 25 (d) 500
  19. 19.Which is closest to 296 × 68? (Round each number first.) (a) 210000 (b) 2100 (c) 21000 (d) 42000
  20. 20.Which is closest to 196 + 103 + 201? (a) 400 (b) 500 (c) 700 (d) 600
  21. 21.Which is closest to 399 ÷ 21? (a) 40 (b) 20 (c) 200 (d) 10
  22. 22.Which is closest to 204 × 79? (Round each number first.) (a) 32000 (b) 16000 (c) 1600 (d) 160000
  23. 23.Round 62220 to the nearest thousand.
  24. 24.Round 11.68 to one decimal place. =
  25. 25.Which is closest to 503 × 61? (Round each number first.) (a) 60000 (b) 3000 (c) 300000 (d) 30000
  26. 26.Round 61241 to the nearest ten.
  27. 27.Which is closest to 297 × 69? (Round each number first.) (a) 210000 (b) 2100 (c) 21000 (d) 42000
  28. 28.Round 62252 to the nearest thousand.
  29. 29.Round 43.54 to one decimal place. =
  30. 30.Which is closest to 596 ÷ 21? (a) 30 (b) 15 (c) 60 (d) 300
  31. 31.Round 85455 to the nearest thousand.
  32. 32.Which is closest to 203 × 21? (Round each number first.) (a) 4000 (b) 8000 (c) 400 (d) 40000
  33. 33.Which is closest to 304 + 700 + 704? (a) 1800 (b) 1900 (c) 1700 (d) 1600
  34. 34.Which is closest to 697 + 697 + 903? (a) 2300 (b) 2200 (c) 2500 (d) 2400
  35. 35.Which is closest to 1799 ÷ 21? (a) 90 (b) 900 (c) 180 (d) 45
  36. 36.Which is closest to 2002 ÷ 49? (a) 400 (b) 40 (c) 80 (d) 20
  37. 37.Which is closest to 199 × 69? (Round each number first.) (a) 140000 (b) 1400 (c) 14000 (d) 28000
  38. 38.Which is closest to 796 + 205 + 300? (a) 1400 (b) 1300 (c) 1200 (d) 1500
  39. 39.Which is closest to 903 × 78? (Round each number first.) (a) 720000 (b) 72000 (c) 7200 (d) 144000
  40. 40.Round 30455 to the nearest hundred.

Answer key

  1. 1800
  2. 300
  3. 70
  4. 10000
  5. 10.5
  6. 12000
  7. 24000
  8. 54.4
  9. 1500
  10. 1600
  11. 39.4
  12. 1700
  13. 12.3
  14. 19.8
  15. 20
  16. 21240
  17. 1600
  18. 50
  19. 21000
  20. 500
  21. 20
  22. 16000
  23. 62000
  24. 11.7
  25. 30000
  26. 61240
  27. 21000
  28. 62000
  29. 43.5
  30. 30
  31. 85000
  32. 4000
  33. 1700
  34. 2300
  35. 90
  36. 40
  37. 14000
  38. 1300
  39. 72000
  40. 30500

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