Wolfram Research
Wolfram Math World: World's Most Extensive Mathematics Resource
MathWorld provides a huge mathematics encyclopedia detailing the concepts of geometry, algebra, calculus, discrete math, number theory, and other math topics--complete with formulas, diagrams, examples, and references for thorough...
University of Regina (Canada)
University of Regina: Math Central: m.c.escher: Mathematics and Visual Arts
This cross-curricular middle school unit integrates mathematics and visual art. Through the study of the M.C. Escher?s work, students explore tiling from both a mathematical and artistic point of view. Points for discussion and...
National Council of Teachers of Mathematics
The Math Forum: Suzanne's Mathematics Lessons 2001
This site by Suzanne Alejandre offers lesson plans, activities and resources covering topics in algebra, geometry, data analysis, number & operations, and measurement. The contents of this site are aligned with the NCTM standards and...
Science Education Resource Center at Carleton College
Serc: Merlot Mathematics Portal: Symmetry and Tilings: An Exploration
A geometry lesson where students read about tilings and tessellations, answer some questions, then explore them using an online interactive. Afterwards, they share and apply their learning in discussion and by examining other tilings.
Other
University of Central Florida: Mathematics Classroom Uses for the Digital Camera
This site has a few creative lesson plans on using the digital camera in a mathematics classroom. Includes geometry and measurement activities. (The link for the counting book does not work in archived version of site.)
Alabama Learning Exchange
Alex: Build a City on Geometry
The students will be split into small, cooperative groups and build a city following specific guidelines. The students will learn how a city is constructed with angles, intersections, parallel, intersecting, and transversal streets. They...
University of Saskatchewan (Canada)
University of Saskatchewan: Geometry
The University of Saskatchewan's Department of Mathematics and Statistics provides high school students with online tutorials and exercises on what they deem some of the most important topics in geometry: Triangles, and Circles and Other...
University of Regina (Canada)
University of Regina: Math Central: Introduction to Slope for Middle Years Mathematics
This collection of five middle school math lessons covers the topic of plane geometry, specifically the concept of slope. The first activity introduces learners to plotting points on a Cartesian grid using a Geoboard. Lesson two moves...
National Council of Teachers of Mathematics
Nctm: Standards for School Mathematics
This standards-based NCTM website offers resources for teachers of mathematics for all grade levels, including interactive math tools, lesson plans, online resources, and the like.
Other
Kodak Lesson Plans: Math
Kodak's site has five lesson plans integrating photography into math lessons. Activities involve geometry and other math concepts for fourth grade on up.
National Council of Teachers of Mathematics
The Math Forum: The Cylinder Problem: Elementary Lesson
Use this lesson plan to help students learn about cylinders. Students will be creating cylinders, and comparing them and their capacity. This engaging, hands-on lesson will hold student interest and be very beneficial to student learning.
National Council of Teachers of Mathematics
The Math Forum: The Cylinder Problem: Middle School Lesson
This lesson offers an interesting, hands-on experience for middle school students studying cylinders. Students will create cylinders, and measure and compare their volumes.
PBS
Pbs Mathline: Bubble Mania Lesson Plan [Pdf]
Determine the area, diameter, and circumerfence of a bubble residue by creating a soap solution and blowing bubbles.
Mathigon
Mathigon: Euclidean Geometry: Euclid's Axioms
This lesson focuses on Euclid's Axioms, simple, intuitive statements, that everyone agrees are true. An axiom(or postulate) is a mathematical statement that is regarded as "self-evident" and accepted without proof. A key part of...
Other
Nearpod: Mixed Review & Practice: Geometry
In this lesson on reviewing fifth-grade geometry concepts, 5th graders learn about the mathematical domain, explain why it is important, and complete a variety of practice problems.
CK-12 Foundation
Ck 12: Interactive Geometry: 4.1 Theorems and Proofs
Understand theorems and proofs as they relate to geometry.
Better Lesson
Better Lesson: Geometry Assessment
Sixth graders solve real-world and mathematical problems involving area, volume and surface area.
CK-12 Foundation
Ck 12: Interactive Geometry: 9.7 Design Problems in Three Dimensions
Learn the mathematics behind modeling in three dimensions to maximize or minimize one aspect of the situation.
Shodor Education Foundation
Shodor Interactivate: Lesson: Surface Area and Volume
Middle schoolers explore surface area and volume through this lesson and worksheet activity.
Better Lesson
Better Lesson: Distributive Property, Day 1
Children need to move from the manipulative expressions of the distributive property into the mathematical equations eventually. This lesson is the first step in leading them to that goal.
Better Lesson
Better Lesson: Rockin' Rhombuses!
Rhombus, the mathematically correct term for "diamond" is the focus of this interactive lesson plan.
AAA Math
Aaa Math: Aaa Math Lessons
AAA Math's interactive tutorials and lessons assist students grades K-8 improve their understanding of a wide range of arithmetic topics. Students are provided with immediate feedback as they complete the "Learn," "Practice," and "Play"...
Illustrative Mathematics
Illustrative Mathematics: G Co Inscribing a Square in a Circle
In this lesson, students learn how to inscribe a square in a circle. Aligns with G-CO.D.13
Mathigon
Mathigon: Geometry: Symmetry in Physics
This lesson focuses on symmetry in physics. The laws of nature are the name given collectively to the physical rules (usually expressed as mathematical equations) that try to explain everything we observe in the universe.