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• Algebraic Thinking
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## Problems

A monthly set of problems targets a variety of ability levels.

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## Threatened to extinction

Hundreds of species of animals around the world are losing their habitats and food supplies, are facing extinction, or have been hunted or otherwise negatively influenced by humans. Students learn about some of these animals and explore multiple solution strategies as they solve this month's problems. 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.

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## Problems

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

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## Problems

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

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## Using PhET Simulations in the Mathematics Classroom

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?

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## January/February 2019 Calendar and Solutions

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## Problems

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

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## Endangered species

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.

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## October 2018 Calendar and Solutions

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## Problem solving with the Greek gods

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.