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teaches Common Core State Standards CCSS.Math.Content.7.SP.C.7 http://corestandards.org/Math/Content/7/SP/C/7
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8

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Big Ideas: We can compute the probability of either one of two outcomes happening by adding their probabilities together. The probability of a desired outcome increases if combined in an either/or statement which increases its ratio. Vocabulary: Complement, ratio, sample space, probability, outcome Special Materials: Paper and crayons to draw spiders or copy spiders from the document provided.
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