National Council of Teachers of Mathematics
Nctm: Figure This: Cut the Cake
A math challenge where geometry, measurement, and problem solving meet. Explore the properties of three dimensional shapes when you discover how six friends can equally divide a nine inch square chocolate cake. A one page activity from...
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Inequalities
"Dr. Math" responds to a student question about solving inequalities. Within the response, a list of the properties of inequalities is provided. Site by Math Forum
CK-12 Foundation
Ck 12: Algebra: Multi Step Equations
[Free Registration/Login may be required to access all resource tools.] Solve equations that involve more than two steps to isolate the variable.
CK-12 Foundation
Ck 12: Algebra: Single Variable Division Equations
[Free Registration/Login may be required to access all resource tools.] Solve single variable equations involving division by applying inverse operations.
CK-12 Foundation
Ck 12: Algebra: Linear Equations Study Guide
This comprehensive study guide highlights the main terms and formulas needed to understand linear equations. Examples are included.
Other
All Elementary Mathematics: Proportionality and Ratio
A brief explanation of the mathematical relationship between ratio, proportion, and proportionality. Examples are included.
Maths Challenge
Maths challenge.net: Inscribed Rectangle
This is a proof problem, considered a "three star" geometry problem requiring knowledge of proofs and properties of circles to solve this equal area of inscribed polygons problem.
Other
Girl Scouts of the Usa: Lighten Up! Discovering the Science of Light [Pdf]
A 36-page booklet of activities and experiments for exploring the properties of and nature of light. Includes a section on careers in optics. As this is a Girl Scouts booklet, it was created with girls in mind, but would be equally...
Texas Instruments
Texas Instruments: Angles Formed by Intersecting Chords, Secants, and Tangents
In this activity, students will investigate properties of angles and arcs formed when chords, secants, and tangents intersect and intercept arcs in a circle. They discover several important theorems concerning circles and arc sizes. They...
TeachEngineering
Teach Engineering: Messin' With Mixtures
In this activity, students investigate the properties of a heterogeneous mixture, trail mix, as if it were a contaminated soil sample near a construction site. This activity shows students that heterogeneous mixtures can be separated by...
Khan Academy
Khan Academy: Normal Distributions Review
Normal distributions come up time and time again in statistics. A normal distribution has some interesting properties: it has a bell shape, the mean and median are equal, and 68% of the data falls within 1 standard deviation.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Adding and Subtracting Inequaliites
"Dr. Math" provides an explanation on remembering when inequalities may be added and subtracted. The explanation is in response to a question submitted by a student.
Bill of Rights Institute
Bill of Rights Institute: Founders Quotes
Liberty must at all hazards be supported. We have a right to it, derived from our Maker. But if we had not, our fathers have earned and bought it for us, at the expense of their ease, their estates, their pleasure, and their blood. -...
Bill of Rights Institute
Bill of Rights Institute: Founding Principles
Below, you will find suggested definitions of each principle. Click here to read the words of James Madison, a primary contributor to the Constitution, and other Founders on these principles.
National Women’s History Museum
National Women's History Museum: The 14th and 15th Amendments
Information on the passage of the 14th and 15th amendments that helped to transform the women's rights movement.
Khan Academy
Khan Academy: The Effects of Ear Canal Acoustics on Hearing Ability
This is a five-question quiz related to the passage "The Effects of Ear Canal Acoustics on Hearing Ability."
Math Open Reference
Math Open Reference: Kite
Learn about kites with this handy reference guide. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.
CK-12 Foundation
Ck 12: Algebra: One Step Equations and Inverse Operations
[Free Registration/Login may be required to access all resource tools.] In this lesson students solve equations involving addition and subtraction. Students examine guided notes, review guided practice, watch instructional videos and...
CK-12 Foundation
Ck 12: Algebra: One Step Equations and Inverse Operations
[Free Registration/Login may be required to access all resource tools.] In this lesson students learn how to solve one-step equations. Students examine guided notes, review guided practice, watch instructional videos and attempt practice...