How to Add Probabilites and Multiply Probabilities Using Marbles

Do you want a red marble and a green marble, or do you want a red marble or a green marble? Calculating the probability in these two situations is very different. Use the fifth video in a series of six to explain the difference in the two models. Scholars learn when to add and multiply when working with probability.

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CCSS: Adaptable
Instructional Ideas

  • Use screen shots from the video to develop a presentation to incorporate guided practice throughout the lesson
  • Emphasize the difference between a situation where probabilities are added or multiplied; an addition problem is only one even, but a multiplication problem has multiple events
Classroom Considerations

  • Requires Internet access to view the YouTube video
Pros

  • Animations help to visualize the problems and make connections to the calculations
  • The explanations are clear and concise
Cons

  • The video does not explain the reason addition or multiplication is appropriate for each situation
Common Core