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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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## April 2019 Calendar and Solutions

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## Building Sets, Video Games, and Scatterplots

Explore the creation of a unique problem-based learning (PBL) experience.

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## Going Over the Test

To address student misconceptions and promote student learning, use discussion questions as an alternative to reviewing assessments.

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## Number Talks for Statistics and Probability

Short, mathematical discussions can elicit students' reasoning and focus on foundational ideas.

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## Problems

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

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## Hanging Around with Platonic Solids

The Platonic solids, also known as the five regular polyhedra, are the five solids whose faces are congruent regular polygons of the same type. Polyhedra is plural for polyhedron, derived from the Greek poly + hedros, meaning “multi-faces.” The five Platonic solids include the tetrahedron, hexahedron, octahedron, dodecahedron, and icosahedron. Photographs 1a-d show several regular polyhedra

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## A Math Field Day: Embed Content with Play

Can you remember your typical elementary school field day? In this article, we provide details on hosting a mathematics field day, focused on embedding rich mathematics into authentic fun-filled field day experiences.

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## Problems

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