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

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### Annette Ricks Leitze, Stephanie Hodge, Danielle Houser, and Clint Mathews

**Animals that are at risk** of becoming extinct are called *endangered species*. They can be very large animals, like a polar bear, or very small, like a monarch butterfly. Learn about several different endangered species by engaging in these math activities.

### Karina K. R. Hensberry, Ian Whitacre, Kelly Findley, Jennifer Schellinger, and Mary Burr Wheeler

Mathematics teaching that provides opportunities for play embodies many of the Mathematics Teaching Practices described in *Principles to Actions: Ensuring Mathematical Success for All* (NCTM 2014). PhET interactive simulations (or sims), developed by the PhET Project at the University of Colorado Boulder (http://phet.colorado.edu), are freely available virtual tools that promote play and exploration in mathematics and science topics for K-16 students.

A cartoon involving equivalent fractions is coupled with a full-page activity sheet.

### Anna F. DeJarnette and Stephen Phelps

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

### David Thompson

For 500 years, dream catchers have been cultural symbols of intrigue worldwide. The most common folkloric design is a 12-point dream catcher. According to Native American legend, the first dream catcher was woven by a “spider woman” to catch the bad dreams of a chief's sick child. Once the bad dreams were caught, the chief's child was healed (Oberholtzer 2012). The basic design has been used for 500 years and is similar to the weaving of a spider's web.

### Mike Pacheco and Heather Glynn Crawford-Ferre

The Internet provides seemingly endless news and media. Unfortunately, not all news stories are accurate. How a story is told depends on who tells it and why. There are strategies for determining whether news stories are fact or fiction. The Media Literacy Council suggests taking into consideration who created or uploaded the information, where it is hosted, and when the information was published (http://www.medialiteracycouncil.sg). Consider these media stories:

### Stephen Phelps

### Edited by Anna F. DeJarnette

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

### Kathy L. Sun, Erin E. Baldinger, and Cathy Humphreys

Support your high school students in the challenging transition from memorization to understanding.