Integer Operations Lesson: Word Problems with All Four Operations, Grades 6-8

The last day asks the question students actually face: which operation does this story need? A "Which operation?" slide gives cue phrases, such as "drops 9 each hour" for a multiplication by −9 and "changed by −26 in 2 hours" for a division by 2, and a habit of writing the operation before working it out. Students then solve multi-step problems that mix adding and subtracting with multiplying and dividing, and say what a product or quotient means in the story.

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