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General Information
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This lesson provides teachers with a way to show students why a negative times a negative equals a positive. The lesson starts with a review of decomposition, the distributive property, and finding missing addends. Then with teacher guidance, groups of students apply these skills in a systematic way to apply properties of operations to discover the rules governing the signs of products for positive and negative factors and to multiply positive and negative numbers in mathematical and real-world problems. Finally, students independently show demonstrate mastery of the lesson objectives by completing an independent practice assessment.
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