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Keep Calm and Show Your Work - NEW Classroom Math Poster;See if your students can catch the math error! 12 x 18 Poster on High Quality heavy 80lb satin cover paper - durable and can stand up to all kinds of abuse and it won't pucker and wrinkle like others do.;This new poster is a PosterEnvy EXCLUSIVE! That means you won't find it anywhere else!;We ship orders out FAST (usually with 24 hours) in heavy duty cardboard tubes!;PosterEnvy has sold thousands of unique educational posters to thousands of happy customers around the world!