Help Algebra
Help algebra.com: Addition Principle
Beginning with a discussion of equivalent equation, this site describes the Addition Principle and how it is used to help solve algebraic equations.
Help Algebra
Help algebra.com: Multiplication Principle
Multiplying on both sides of an equation is demonstrated with several examples. The resource also includes dividing on both sides in order to solve an equation.
CK-12 Foundation
Ck 12: Algebra: Single Variable Addition Equations
[Free Registration/Login may be required to access all resource tools.] Solve single variable addition equations
CK-12 Foundation
Ck 12: Algebra: Single Variable Subtraction Equations
[Free Registration/Login may be required to access all resource tools.] Solve single variable subtraction equations
CK-12 Foundation
Ck 12: Algebra: Single Variable Subtraction Equations
[Free Registration/Login may be required to access all resource tools.] Solve single variable equations involving subtraction.
CK-12 Foundation
Ck 12: Algebra: Single Variable Addition Equations
[Free Registration/Login may be required to access all resource tools.] Solve single variable equations involving addition.
Texas A&M University
Wtamu Virtual Math Lab: College Algebra: Linear Equations in One Variable
Through this tutorial, which offers step-by-step examples, video explanations, and practice questions, you'll learn what linear equations are and how to solve and classify them.
Khan Academy
Khan Academy: Divide by 1
Divide by 1. Quotients are less than or equal to 10. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video tutorial, or receive division hints. CCSS.Math.Content.3.OA.C.7 Fluently...
Khan Academy
Khan Academy: One Step Multiplication & Division Equations
Based on our understanding of the balance beam model, we know that that to keep a true equation, we always have to do the same thing to both sides of an equation. But how do we know what to do to both sides of the equation? Learn to...
Digital History
Digital History: Feminism Reborn
This comprehensive survey of the women's movement during the 1960s and 1970s documents women and politics, women's wages, legal discrimination against women, stereotypes of women, women's rights legislation, and women's rights...
University of Saskatchewan (Canada)
University of Saskatchewan: Inequalities
This University of Saskatchewan looks at the basic rules of solving inequalities, concentrating on inequalities with absolute values. Includes example problems and exercises with their solutions.
CK-12 Foundation
Ck 12: Algebra: Two Step Equations With Subtraction and Division
[Free Registration/Login may be required to access all resource tools.] Solve one and two-step equations by using the inverse properties of subtraction and division
Illustrative Mathematics
Illustrative Mathematics: Fact Families
As a whole class, the teacher presents students with 3 numbers on cards, such as 5, 8, and 3. The teacher asks the students to find all the ways the numbers can be put together in addition or subtraction sentences. This lesson includes...
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.