Texas Instruments
Texas Instruments: Number Smash
In this activity, students explore basic Algebra concepts and Number sense. They learn the definition of sign numbers, absolute value, and numbers of opposite sign.
Khan Academy
Khan Academy: Signs of Sums
Practice determining whether the sum of two numbers is positive, negative, or zero. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Other
Colorado College: A Brief History of the Civil Rights Act of 1964
A very good explanation of the problems and political machinations that happened behind the scenes in both the House of Representatives and Senate as the wording of the Civil Rights Act of 1964 was developed. See how the legislation was...
Government of Alberta
Learn Alberta: Exploring Similarity and Congruence
Begin by watching this captivating video showing how the concepts of similarity and congruence are found in road signs. Following the video [1:27], an interactive applet allows students to resize, flip, move and rotate triangles to...
Other
Social Security Act of 1935
A good overview of the Social Security Act, what it included, why it was proposed, and those whom it protected. Included are reasons for opposition to the act and mention of those who were left out of coverage. You can also read Franklin...
Curated OER
Guardian: Mugabe and Tsvangirai Sign Deal to Hold Zimbabwe Power Sharing Talks
President Mugabe of Zimbabwe and the opposition leader, Morgan Tsvangirai
CK-12 Foundation
Ck 12: Arithmetic: Differences of Integers Using Absolute Value
[Free Registration/Login may be required to access all resource tools.] Subtract integers by using opposites
American Public Media
American Radio Works: The Southern Manifesto
The Southern Manifesto, written in opposition to the racial integration of public places and condemning the Supreme Court's 1954 school desegregation decision, was signed by 101 congressmen from the Deep South.
University of Virginia
Miller Center at Uva: u.s. Presidents: Martin Van Buren
Get the facts about the life and administraton of Martin Van Buren (1782-1862), the 8th President of the United States (1837-1841).
Texas Instruments
Texas Instruments: Cabri Jr. Tangent to a Chord
This activity uses Cabri Jr. to discover that the angle between a tangent and a chord is equal to the inscribed angle on the opposite side of the chord.
Mathigon
Mathigon: Geometry: Triangles and Trigonometry: Pythagoras' Theorem
Pythagoras' Theorem: In any right-angled triangle, the square of the length of the hypotenuse (the side that lies opposite the right angle) is equal to the sum of the squares of the other two sides. (A+B=C)
Purple Math
Purplemath: Quadrants and Angles
Explains how to model angles in the x,y-plane, and demonstrates how to extend the concept of trig ratios to angles larger than 90 degrees.
Other
Angel vs. Devil: Vanquish Writer's Block
Author Karen Wiesner describes the angel muse and the devil muse that sit on opposite shoulders, building up or tearing down confidence. She gives the telltale signs of the devil muse at work and suggests counter attacks to help the...