A rhombus has four congruent sides. A rectangle has four congruent angles. But a square has four congruent sides and four congruent angles. Using a Venn diagram, the relationship would look like this: ...

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 ...

These grade-band specific professional learning modules are focused on the Effective Teaching Practices and Guiding Principles from Principles to Actions: Ensuring Mathematical Success for All.

When students become active doers of mathematics, the greatest gains of their mathematical thinking can be realized. The process of sense making begins when we create classrooms full of curious ...

Creating, supporting, and sustaining a culture of access and equity require being responsive to students' backgrounds, experiences, cultural perspectives, traditions, and knowledge when designing and ...

This tool allows you to create any geometric shape imaginable. Squares, triangles, rhombi, trapezoids and hexagons can be created, colored, enlarged, shrunk, rotated, reflected, sliced, and glued ...

Procedural fluency is an essential component of equitable teaching and is necessary to developing mathematical proficiency and mathematical agency. Each and every student must have access to teaching ...

A comprehensive and coherent set of mathematics standards for each and every student from prekindergarten through grade 12, Principles and Standards is the first set of rigorous, college and career ...

Bobbie Bear is planning a vacation and wants to know how many outfits can be made using different colored shirts and pants. Click on a shirt or a pair of pants and drag it over Bobbie Bear. Release ...

Change the number of sectors and increase or decrease their size to create any type of spinner. Then, conduct a probability experiment by spinning the spinner many times. How does the experimental ...

NCTM is committed to offering standards-based resources that improve the teaching and learning of mathematics for each and every student. Explore these resources and ...

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