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In a professional development session, teachers reflect on their mathematical practice following the reading of the MTMS article, “12 Math Rules that Expire.” The ideas in the article elicited teachers' awareness of mathematics that they emphasize in instruction and implications for student learning.

“Math by the Month” activities are designed to engage students to think as mathematicians do. Students may work on the activities individually or in small groups, or the whole class may use these as problems of the week. Because no solutions are suggested, students will look to themselves for mathematical justification, thereby developing the confidence to validate their work.

“Math by the Month” activities are designed to engage students to think as mathematicians do. Students may work on the activities individually or in small groups, or the whole class may use these as problems of the week. Because no solutions are suggested, students will look to themselves for mathematical justification, thereby developing the confidence to validate their work.