The Maths Habit

Probabilities that add to 1

Probability · Foundation · 6:53

Worksheet (PDF) Answers (PDF)

Chapters

  1. 0:00Introduction
  2. 0:26Do Now
  3. 1:12The probabilities add to 1
  4. 2:03P(not A) = 1 − P(A)
  5. 2:43Example 1: a missing decimal
  6. 3:22Example 2: a missing fraction
  7. 3:57Example 3: two equal probabilities
  8. 4:38Your turn
  9. 5:20Common mistake
  10. 6:00Worksheet and exit question

Practise probabilities that add to 1 for 15 minutes a day in The Maths Habit, on your phone or in your browser.

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