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## Chalk Talk: Engaging All Students in Visible Thinking

We share two examples of student engagement in visible, mathematical thinking through a Chalk Talk within the four walls of the classroom, as well as the connected spaces of online learning. Five steps for facilitating the Chalk Talk are outlined, with descriptions of teacher moves for each step.

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## How Big Is a Leaf? Mathematical Modeling Through STEM Inquiry

Grade 4 students engage in problem solving through inquiry in an agricultural science context.

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## The Life and Times of a Third-Grade Pencil

Students determine the usable lifespan of a pencil in this mathematical modeling activity.

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## Branch Play

This article describes how fortuitous mathematical moments should be noticed, encouraged, embraced, and capitalized upon.

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## GPS: How Long? Estimating Length and Time

Growing Problem Solvers provides four original, related, classroom-ready mathematical tasks, one for each grade band. Together, these tasks illustrate the trajectory of learners’ growth as problem solvers across their years of school mathematics.

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## Introducing Grade 3 Students to Digital Data Exploration

Bar graphs are fundamental to display distributions of categorical variables in primary school. Here is an approach using TinkerPlots™ to create bar graphs on different representation levels in small and large data sets.

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## Exploring Relative Size with Relative Risk

The Relative Risk Tool web app allows students to compare risks relating to COVID-19 with other more familiar risks, to make multiplicative comparisons, and to interpret them.

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## Exploring Data from Lived Experiences: A Pandemic Case

Use a COVID-19 lesson as an example of how to apply a framework aligned with research recommendations to support students as they apply mathematics to real life.

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## Bridging Modeling and Environmental Issues

The Great Pacific Garbage Patch activity involves an urgent environmental issue that students can discuss. It engages students in the interpretation of visual data, measurements, units, and the area of regular and irregular figures.

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