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Probability of the opposite event: fractions

Year 8 maths · Fieldbook Learning

Name ______________________ Date __________

The probability of an event and the probability that it does not happen add up to 1 (or 100%).

  1. The probability of winning a game is 6/9. What is the probability of not winning? Write a fraction in lowest terms.
  2. The probability of winning a game is 4/5. What is the probability of not winning? Write a fraction in lowest terms.
  3. The probability of winning a game is 1/7. What is the probability of not winning? Write a fraction in lowest terms.
  4. The probability of winning a game is 7/10. What is the probability of not winning? Write a fraction in lowest terms.
  5. The probability of winning a game is 2/12. What is the probability of not winning? Write a fraction in lowest terms.
  6. The probability of winning a game is 9/11. What is the probability of not winning? Write a fraction in lowest terms.
  7. The probability of winning a game is 1/4. What is the probability of not winning? Write a fraction in lowest terms.
  8. The probability of winning a game is 2/4. What is the probability of not winning? Write a fraction in lowest terms.
  9. The probability of winning a game is 4/6. What is the probability of not winning? Write a fraction in lowest terms.
  10. The probability of winning a game is 5/16. What is the probability of not winning? Write a fraction in lowest terms.
  11. The probability of winning a game is 7/14. What is the probability of not winning? Write a fraction in lowest terms.
  12. The probability of winning a game is 1/3. What is the probability of not winning? Write a fraction in lowest terms.
  13. The probability of winning a game is 2/14. What is the probability of not winning? Write a fraction in lowest terms.
  14. The probability of winning a game is 2/7. What is the probability of not winning? Write a fraction in lowest terms.
  15. The probability of winning a game is 15/26. What is the probability of not winning? Write a fraction in lowest terms.
  16. The probability of winning a game is 6/23. What is the probability of not winning? Write a fraction in lowest terms.
  17. The probability of winning a game is 1/5. What is the probability of not winning? Write a fraction in lowest terms.
  18. The probability of winning a game is 27/31. What is the probability of not winning? Write a fraction in lowest terms.
  19. The probability of winning a game is 7/35. What is the probability of not winning? Write a fraction in lowest terms.
  20. The probability of winning a game is 20/32. What is the probability of not winning? Write a fraction in lowest terms.
More free practice: fieldbooklearning.com/uk/practice/year-8/probability-of-the-opposite-event-fractions/

Answer key: Probability of the opposite event: fractions

  1. 1/3
  2. 1/5
  3. 6/7
  4. 3/10
  5. 5/6
  6. 2/11
  7. 3/4
  8. 1/2
  9. 1/3
  10. 11/16
  11. 1/2
  12. 2/3
  13. 6/7
  14. 5/7
  15. 11/26
  16. 17/23
  17. 4/5
  18. 4/31
  19. 4/5
  20. 3/8