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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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## Mathematical Modeling as a Tool for Empowerment

Ear to the Ground features voices from several corners of the mathematics education world.

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## Using CODAP to Grow Students’ Probabilistic Reasoning

Draw on two simulations to introduce compound events and help your class make connections between experimental and theoretical probabilities.

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## Teaching Word-Problem Solving through Tape Diagrams

Get familiar with this visual instructional tool to help students make sense of mathematical relationships and select suitable operations for word problems at varied grade levels.

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## Math, Will You Be My Valentine?

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## Routines for Learning Modeling Practices and Content

The authors share a teacher-designed mathematical modeling routine geared to support teachers and to leverage opportunities for their students in learning important modeling practices and mathematical content.

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## Discovering Area Models: The Giant Sicilian Pizza Task

This hands-on task, featuring differentiation and open-ended learning, sets up students to discover area models for themselves. Organized around NCTM’s eight teaching practices from Principles to Actions, this article describes the task’s setup and implementation.

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## GPS: Diving into Dolphin Data

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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## Exploring Matrices with Spreadsheets

Bridge the digital divide by teaching students a useful technological skill while enhancing mathematics instruction focused on real-life matrix applications.

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## Comparing Probabilities: Rock, Paper, Scissors, and Coin Toss

In this activity, students find the theoretical probabilities of winning a coin toss and a round of the rock, paper, scissors game. They next devise strategies to win and test them out. Students then compare the theoretical probabilities they found with the experimental probabilities.