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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 896 · 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 99.41 to one decimal place. =
  2. 2.Which is closest to 199 + 496 + 504? (a) 1100 (b) 1400 (c) 1300 (d) 1200
  3. 3.Round 80714 to the nearest thousand.
  4. 4.Which is closest to 594 ÷ 31? (a) 40 (b) 20 (c) 200 (d) 10
  5. 5.Which is closest to 1509 ÷ 51? (a) 15 (b) 30 (c) 300 (d) 60
  6. 6.Round 5927 to the nearest ten.
  7. 7.Which is closest to 899 × 89? (Round each number first.) (a) 162000 (b) 8100 (c) 81000 (d) 810000
  8. 8.Which is closest to 203 × 89? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  9. 9.Round 64.69 to one decimal place. =
  10. 10.Which is closest to 196 × 30? (Round each number first.) (a) 12000 (b) 600 (c) 6000 (d) 60000
  11. 11.Which is closest to 97 + 299 + 896? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  12. 12.Round 47.89 to one decimal place. =
  13. 13.Round 34576 to the nearest thousand.
  14. 14.Which is closest to 302 + 203 + 905? (a) 1400 (b) 1300 (c) 1600 (d) 1500
  15. 15.Round 71.77 to one decimal place. =
  16. 16.Which is closest to 295 + 196 + 596? (a) 1000 (b) 1100 (c) 1200 (d) 1300
  17. 17.Round 31320 to the nearest thousand.
  18. 18.Which is closest to 702 × 30? (Round each number first.) (a) 210000 (b) 2100 (c) 42000 (d) 21000
  19. 19.Which is closest to 501 × 68? (Round each number first.) (a) 35000 (b) 3500 (c) 350000 (d) 70000
  20. 20.Which is closest to 999 ÷ 19? (a) 100 (b) 50 (c) 25 (d) 500
  21. 21.Which is closest to 99 + 98 + 205? (a) 300 (b) 600 (c) 400 (d) 500
  22. 22.Round 25.62 to one decimal place. =
  23. 23.Which is closest to 102 + 404 + 597? (a) 1200 (b) 1300 (c) 1100 (d) 1000
  24. 24.Which is closest to 804 ÷ 21? (a) 400 (b) 20 (c) 40 (d) 80
  25. 25.Which is closest to 802 + 301 + 199? (a) 1300 (b) 1500 (c) 1200 (d) 1400
  26. 26.Which is closest to 496 + 597 + 101? (a) 1400 (b) 1200 (c) 1100 (d) 1300
  27. 27.Which is closest to 605 + 201 + 803? (a) 1700 (b) 1800 (c) 1500 (d) 1600
  28. 28.Round 35.06 to one decimal place. =
  29. 29.Which is closest to 400 × 61? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  30. 30.Which is closest to 1592 ÷ 39? (a) 20 (b) 40 (c) 400 (d) 80
  31. 31.Which is closest to 897 × 81? (Round each number first.) (a) 144000 (b) 72000 (c) 720000 (d) 7200
  32. 32.Round 55482 to the nearest thousand.
  33. 33.Round 15840 to the nearest thousand.
  34. 34.Which is closest to 403 ÷ 21? (a) 200 (b) 20 (c) 10 (d) 40
  35. 35.Which is closest to 499 + 604 + 705? (a) 2000 (b) 1800 (c) 1900 (d) 1700
  36. 36.Round 96.58 to one decimal place. =
  37. 37.Which is closest to 505 + 102 + 702? (a) 1300 (b) 1500 (c) 1200 (d) 1400
  38. 38.Which is closest to 1195 ÷ 21? (a) 30 (b) 120 (c) 60 (d) 600
  39. 39.Round 21449 to the nearest ten.
  40. 40.Which is closest to 1497 ÷ 29? (a) 500 (b) 25 (c) 100 (d) 50

Answer key

  1. 99.4
  2. 1200
  3. 81000
  4. 20
  5. 30
  6. 5930
  7. 81000
  8. 18000
  9. 64.7
  10. 6000
  11. 1300
  12. 47.9
  13. 35000
  14. 1400
  15. 71.8
  16. 1100
  17. 31000
  18. 21000
  19. 35000
  20. 50
  21. 400
  22. 25.6
  23. 1100
  24. 40
  25. 1300
  26. 1200
  27. 1600
  28. 35.1
  29. 24000
  30. 40
  31. 72000
  32. 55000
  33. 16000
  34. 20
  35. 1800
  36. 96.6
  37. 1300
  38. 60
  39. 21450
  40. 50

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