From the introduction: One important key to a student\rq s success in math is being able to communicate mathematically. To do so, students need to develop a language for expressing mathematical ideas. Writing is a good communication tool because it allows students to express their understanding in a less public forum; and helps students refine their thinking because they must reflect on and clarify their ideas. For these reasons, students should engage in writing activities in math class. To encourage writing, we designed and taught a lesson in which middle-grades students were asked to write a mathematical poem. We chose two types of poetry ‒ the limerick and haiku ‒ to discuss because they involve specific patterns that are based on numbers of syllables and rhythms. The students were instructed to pick any math concept and use it to create their own original poem.