Discover the area formula of circles by separating into congruent shapes and using their understanding of other polygons. Give students an opportunity to estimate the area of the circular objects that ...

This tool allows you to learn about various geometric solids and their properties. You can manipulate and color each shape to explore the number of faces, edges, and vertices, and you can also use ...

Powerful Mathematicians Who Changed the World From A to Z introduces 26 inspiring figures—from ancient innovators to modern pioneers—whose ideas transformed mathematics. With engaging bios, ...

The buttons are meant to be used sequentially, and will appear in the order they are meant to be pressed. Do not press buttons before all movements are complete. The Reset button can be used at any ...

The rules of Krypto are simple: Combine five number cards using the four arithmetic operations (+, –, ×, ÷) to arrive at a "target" number. This online version of Primary Krypto uses the numbers 1–10 ...

Problems to Ponder is a popular monthly series of 28 varying, classroom-ready mathematics problems—designed for PK–grade 12 and available with membership through the Mathematics Teacher: Learning and ...

Use your NCTM login to access the Speaker Ready Room portal to accept or decline the invitation to speak, add your speaker bio, add presentation handouts, view your presentation day/time/room or view ...

Dr. Amanda Jansen is a professor in the School of Education at the University of Delaware. She is a mathematics educator who conducts research on students’ engagement in mathematics classrooms and ...

The purpose of this book study guide is to provide stakeholder groups with a tool to initiate needed critical conversations and actions in early childhood and elementary mathematics. Format: The book ...

Join NCTM as we celebrate our Centennial with 100 Days of Professional Learning - live, free webinars presented by selected speakers from the NCTM Centennial Annual Meeting program that was to be held ...

I love the story of Carl Friedrich Gauss—who, as an elementary student in the late 1700s, amazed his teacher with how quickly he found the sum of the integers from 1 to 100 to be 5,050. Gauss ...

People of all ages love to play games that are fun and motivating. Games give students opportunities to explore fundamental number concepts, such as the counting sequence, one-to-one correspondence, ...