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## Conditional Reasoning Online with Mastermind

As mathematical patterns become more complex, students' conditional reasoning skills need to be nurtured so that students continue to critique, construct, and persevere in making sense of these complexities. This article describes a mathematical task designed around the online version of the game Mastermind to safely foster conditional reasoning.

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## Investigating Using Lesson Study

Our middle school mathematics department used lesson study to investigate how to introduce fractions division to our sixth-grade students. We highlight our learnings during the Study and Plan phases, describe our observations during the lesson, and provide tips for educators interested in using lesson study to study their own content.

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## Mathematizing Multilevel Marketing

This article dives into the importance of engaging students in investigating the mathematics of businesses that pressure their members to recruit new members as a basis for success, also referred to as multi-level marketing (MLM). The mathematics behind these businesses are discussed, and a sample student task is given.

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## Revitalizing and Repurposing Conventional Word Problems

Conventional word problems can't help students build mathematical modeling skills. on their own. But they can be leveraged! We examined how middle and high school students made sense of word problems and offer strategies to question and extend word problems to promote mathematical reasoning.

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## Giving Birth to Inferential Reasoning

Too often, statistical inference and probability are treated in schools like they are unrelated. In this paper, we describe how we supported students to learn about the role of probability in making inferences with variable data by building models of real world events and using them to simulate repeated samples.

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## With Reason: A Portrait of Sophia Kovalevsky (1850–1891)

Sophia Kovalevsky's story

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## Supporting Teacher Learning through “Sketching Standards”

K-5 teachers deepen their understanding of the Common Core content standards by engaging in collaborative drawing activities during professional development workshops.

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## Palette of Problems – April 2014

A monthly set of problems is aimed at a variety of ability levels.

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## Palette of Problems – December 2013 / January 2014

A monthly set of problems is aimed at a variety of ability levels.

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## Quick Reads: Journaling: Out with the Old

### a good idea in a small package

Students' writings in math class can be used for both reflection and assessment.