By examining ratios in paintings and using a free educational app, students can size up artists' use of proportional reasoning in their creations.

Supplementary Materials

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Contributor Notes

Sarah B. Bush,, is an associate professor of mathematics education and associate dean at Bellarmine University in Louisville, Kentucky. She is a former middle-grades mathematics teacher who is interested in interdisciplinary and relevant, engaging mathematics tasks for elementary and middle school students.

Karen S. Karp,, is a visiting professor at Johns Hopkins University in Baltimore, Maryland. She is a past member of the NCTM Board of Directors, and a former president of the Association of Mathematics Teacher Educators. Her current scholarship focuses on teaching interventions for students in the elementary and middle grades who are struggling to learn mathematics.

Jennifer Nadler is the K–12 and Educator Programs Manager at the Barnes Foundation in Philadelphia, Pennsylvania. She integrates math with art activities for students visiting the institution.

Katie Gibbons is a seventhgrade mathematics teacher at Noe Middle School in Louisville, Kentucky. She is interested in teaching mathematics through meaningful contexts and by incorporating technology in the classroom.

(Corresponding author is Bush
(Corresponding author is Karp
Mathematics Teaching in the Middle School
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