Imagine that you and your language arts colleagues are teaching Edgar Allan Poe's short story, “The Pit and the Pendulum.” This thrilling story takes us to the Inquisition during which a prisoner is surrounded by hungry rats and bound to a table while a large pendulum slowly descends. The prisoner believes that the pendulum is 30-40 feet long and estimates that it should take about 10-12 swings before he is hit, leaving him with about a minute or a minute and a half to escape. Are his estimations correct? If so, will he make it out in time?

# Browse

### Haiwen Chu and Leslie Hamburger

Five types of engaging peer-interaction structures can support English learners as they make sense of mathematics and explore important mathematical relationships.

### 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.

### 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.

### Molly Fefolt and Terri L. Kurz

Math by the Month features collections of short activities focused on a monthly theme. These articles aim for an inquiry or problem-solving orientation that includes four activities each for grade bands K–2, 3–4, and 5–6. In this issue, students explore mathematical challenges within the context of the Greek gods. Activities are provided for elementary school children to support their exploration of mathematics in everyday situations.

### Edited by Anna F. DeJarnette and Stephen Phelps

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