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.

Concepts

compound probability, probability

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Additional Tags

math

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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

• This video is hosted on YouTube

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

HSS-CP.A.2 HSS-CP.B.7