This task is from Tools for NC Teachers. Students explore the dimensions of a carpet that is needed to cover a floor. This is remixable. 

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A classroom wants to have 60 square meters of carpet for shared reading time.  Two carpets have been placed in the classroom, but there is still not enough space.  Draw the third carpet that would be needed to make a total of 60 square meters of carpet.  Use drawings, numbers, equations, and/or words to explain how you found your answer.