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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 578 · 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 4949 to the nearest hundred.
  2. 2.Round 73429 to the nearest thousand.
  3. 3.Which is closest to 300 × 31? (Round each number first.) (a) 90000 (b) 900 (c) 9000 (d) 18000
  4. 4.Which is closest to 599 × 28? (Round each number first.) (a) 18000 (b) 36000 (c) 1800 (d) 180000
  5. 5.Which is closest to 396 ÷ 21? (a) 200 (b) 10 (c) 40 (d) 20
  6. 6.Round 69341 to the nearest ten.
  7. 7.Round 61.67 to one decimal place. =
  8. 8.Round 6618 to the nearest ten.
  9. 9.Which is closest to 299 × 39? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  10. 10.Which is closest to 697 × 69? (Round each number first.) (a) 4900 (b) 98000 (c) 49000 (d) 490000
  11. 11.Which is closest to 199 × 42? (Round each number first.) (a) 80000 (b) 800 (c) 8000 (d) 16000
  12. 12.Round 73.33 to one decimal place. =
  13. 13.Which is closest to 196 + 101 + 800? (a) 1200 (b) 1000 (c) 1100 (d) 1300
  14. 14.Round 48.46 to one decimal place. =
  15. 15.Which is closest to 796 × 78? (Round each number first.) (a) 128000 (b) 64000 (c) 640000 (d) 6400
  16. 16.Which is closest to 296 × 18? (Round each number first.) (a) 600 (b) 60000 (c) 6000 (d) 12000
  17. 17.Which is closest to 498 × 61? (Round each number first.) (a) 60000 (b) 300000 (c) 30000 (d) 3000
  18. 18.Which is closest to 103 + 195 + 195? (a) 600 (b) 700 (c) 500 (d) 400
  19. 19.Round 79.26 to one decimal place. =
  20. 20.Which is closest to 98 + 499 + 204? (a) 800 (b) 900 (c) 1000 (d) 700
  21. 21.Round 47808 to the nearest hundred.
  22. 22.Which is closest to 500 + 598 + 500? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  23. 23.Round 99.36 to one decimal place. =
  24. 24.Which is closest to 198 + 897 + 397? (a) 1600 (b) 1700 (c) 1500 (d) 1400
  25. 25.Round 69.89 to one decimal place. =
  26. 26.Which is closest to 201 × 59? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  27. 27.Which is closest to 4008 ÷ 51? (a) 800 (b) 40 (c) 160 (d) 80
  28. 28.Round 95681 to the nearest thousand.
  29. 29.Which is closest to 896 ÷ 31? (a) 15 (b) 300 (c) 30 (d) 60
  30. 30.Round 47676 to the nearest thousand.
  31. 31.Which is closest to 3594 ÷ 41? (a) 90 (b) 45 (c) 900 (d) 180
  32. 32.Which is closest to 899 × 69? (Round each number first.) (a) 126000 (b) 6300 (c) 63000 (d) 630000
  33. 33.Which is closest to 403 + 499 + 502? (a) 1300 (b) 1500 (c) 1600 (d) 1400
  34. 34.Which is closest to 301 × 18? (Round each number first.) (a) 600 (b) 12000 (c) 60000 (d) 6000
  35. 35.Which is closest to 397 × 39? (Round each number first.) (a) 160000 (b) 16000 (c) 32000 (d) 1600
  36. 36.Which is closest to 505 + 301 + 597? (a) 1300 (b) 1500 (c) 1600 (d) 1400
  37. 37.Round 44889 to the nearest hundred.
  38. 38.Which is closest to 897 × 20? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  39. 39.Which is closest to 501 + 96 + 495? (a) 1300 (b) 1000 (c) 1100 (d) 1200
  40. 40.Which is closest to 3594 ÷ 39? (a) 900 (b) 180 (c) 45 (d) 90

Answer key

  1. 4900
  2. 73000
  3. 9000
  4. 18000
  5. 20
  6. 69340
  7. 61.7
  8. 6620
  9. 12000
  10. 49000
  11. 8000
  12. 73.3
  13. 1100
  14. 48.5
  15. 64000
  16. 6000
  17. 30000
  18. 500
  19. 79.3
  20. 800
  21. 47800
  22. 1600
  23. 99.4
  24. 1500
  25. 69.9
  26. 12000
  27. 80
  28. 96000
  29. 30
  30. 48000
  31. 90
  32. 63000
  33. 1400
  34. 6000
  35. 16000
  36. 1400
  37. 44900
  38. 18000
  39. 1100
  40. 90

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