Founded in 1920, the National Council of Teachers of Mathematics (NCTM) is the world's largest mathematics education organization throughout the United States and Canada.

Thinking about numbers using frames of 10 can be a helpful way to learn basic number facts. The four games that can be played with this applet help to develop counting and addition skills. (This ...

Quilters and other designers sometimes start by producing square patches with a pattern on them. These square patches are then repeated and connected to produce a larger pattern. Create your own patch ...

Choose a polygon, and reshape it by dragging the vertices to new locations. As the figure changes shape, the angle measures will automatically update. Animation: For triangles and quadrilaterals, you ...

A teacher shares strategies for helping students communicate their thinking about mathematics.

This interactive pan balance allows numeric or algebraic expressions to be entered and compared. You can "weigh" the expressions you want to compare by entering them on either side of the balance.

Learn about Universal Design for Learning (UDL) and Differentiation as tools that support students' access to and advancement of mathematics engagement and learning. We will define, compare, and ...

Exploring Math through Literature, Pre-K–8 is an online teacher resource filled with lessons and activities that teach mathematical concepts while engaging students in a broad assortment of children’s ...