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The March of Time
England Pride
MOT 1939: ENGLAND PRIDE: LA WS London building lamps FG. WS Street Big Ben clock tower BG. WS River Thames. HA WS English royal guards walking through archway. WS British Home Guards on horses. VS Coldstream Guards marching at Buckingham...
Khan Academy
Histograms, Applying Mathematical Reasoning, Pre-Algebra
Another way to organize data beyond the stem and leaf plot - the histogram - is the focus of this lesson. Sal's objective is to introduce viewers to these methods of organization, making them familiar and straightforward, so students can...
Khan Academy
Exponential Growth Functions, Exponential and Logarithmic Functions, Algebra II
Sal solves several problems involving exponential growth functions for two reasons. First, he aims to familiarize viewers with the process, particularly for those who find exponents challenging or daunting. Second, Sal wants to show how...
Khan Academy
Inequalities Using Addition and Subtraction, Linear Inequalities, Algebra I
Beginning with a "handful of fairly simple inequality videos," Sal demonstrates a few inequality problems in which mathematicians must add or subtract. Though he states that his goal is to familiarize viewers with the notation, his...
Khan Academy
Factoring Special Products, Polynomial and Rational Functions, Algebra II
"Just to get the point drilled into your head," Sal continues his lecture on factoring quadratic expressions, focusing on special products. He works to instill the problem-solving skills necessary to factor in equations quickly and...
Khan Academy
How to Rationalize a Denominator, Exponent Expressions and Equations, Algebra I
"Sal, why do we care? Why must we rationalize denominators?" Acknowledging these (possibly pleading) concerns, Sal explains the reasons behind rationalizing a denominator before demonstrating how to do it several times. Though he admits...
Khan Academy
Multiplying and Dividing with Inequalities, Linear Inequalities, Algebra I
Things get a little more complicated in this video, which features Sal solving several inequality problems involving multiplying and dividing by positive and negative numbers. Additionally, he uses a few more kinds of notation to...
Khan Academy
Extraneous Solutions to Radical Equations, Algebra I
In this video, Sal brings it all together and incorporates the concepts from previous lectures (quadratic formula, multiplying polynomial expressions, radical expressions, exponents). This video would be a great way to end a unit or...
Khan Academy
Compound Inequalities, Linear Inequalities, Algebra I
After defining compound inequality problems as "just inequality problems that have more than one set of constraints," Sal goes on to solve several sample problems. Those who have a hard time with multi-step equations might find this...
Khan Academy
Pythagorean Theorem, Right Triangles and Trigonometry, Geometry
In this video, Sal introduces the Pythagorean Theorem to viewers, crossing into the realm of geometry. He uses several examples, including right triangles, to illustrate the applications and uses of the Pythagorean Theorem.
Khan Academy
Graphs of Linear Equations, Linear Equations and Functions, 8th grade
Sal is plotting away in this video - but don't worry, it's nothing suspicious. He introduces linear equations, taking viewers through a few simple examples before applying the knowledge to more complex word problems.
Khan Academy
Example: Two-Step Equations, Linear Equations, Algebra I
Sal adds a few more steps to these problems as he solves algebraic equations with two steps, though he states that "there's more than one way to do it." Those who become confused by increasingly complicated algebra problems on a test...
Khan Academy
Absolute Value Inequalities, Linear Equations, Algebra I
Combining the skills from the previous videos, particularly inequalities and absolute values, Sal works to solve several new sample problems. He encourages watching the video "over and over," which is good advice for mathematicians of...
Khan Academy
Absolute Value Equations
Sal reviews absolute value equations by taking viewers through a careful and deliberate problem-solving process. Those who didn't thoroughly understand absolute value during class will appreciate Sal's steady and straightforward...
CK-12 Foundation
Ck 12: Algebra: Direct Variation
[Free Registration/Login may be required to access all resource tools.] Learn how to recognize and write equations of direct variation and try practice exercises. [11:11]
CK-12 Foundation
Ck 12: Plant Cell Structures: Parts of a Plant Cell
[Free Registration/Login may be required to access all resource tools.] Take a tour of a plant cell and see how they differ from animal cells. Also take a look at the unique characteristics that some plants have. [2:57]
CK-12 Foundation
Ck 12: Division of Rational Numbers
[Free Registration/Login may be required to access all resource tools.] Explains that when you divide rational numbers, you may be dividing fractions, decimals, or positive or negative numbers. Each of these is then demonstrated. [4:38]