Triangles: Pythagorean Theorem, The
This clip introduces the Pythagorean Theorem, named for the Greek mathematician Pythagoras. In addition to explaining the theorem itself, the clip explains how it is commonly used, including as a way to determine if a triangle is a right triangle, a...
Solving Equations: Building and Solving A New Equation
This clip explains how to work through an equation step by step, beginning by "collecting" all the unknowns on one side of the equation and all the constants on the other.
Solving Equations: Equation Involving Subtraction, An
This clip demonstrates how to solve an equation involving subtraction, X-9=7, which eventually comes out to be X=7+9, or 16.
Ratio and Proportion: Summary: Ratio and Proportion
This clip summarizes the key points pertaining to ratio and proportion. It explains that a ratio is a kind of fraction used to describe the relative sizes of two numbers, also noting that a proportion is a statement that two ratios are equal. The cl...
Equations and Formulas
An introduction to simple algebra with emphasis placed on reading formulas correctly, manipulating formulas, ratios and proportions, and using standard formulas to solve word problems.
Dividing Fractions: Why Does Invert and Multiply Work?
This clip takes the viewer on what it calls a "reason-by-reason, step-by-step...side trip" into why the "invert and multiply" rule works. The clip states that it's not absolutely necessary to take this side trip, and that "
as long as you remember ...
Fluid Volume: Practical Problems: Unit Equivalences
This clip includes several practical problems which are solved in part through the use of unit equivalences and the unit cancellation method taught in an earlier lesson.
Another Literal Equation
Solving a literal equation: C = NC 9.
Solving an Equation with a Fraction Containing Different Denominators
Solving an equation with two fractions containing different denominators.
Practical Problem: Finding the Price of Chairs
A practical problem is used to demonstrate the strategy of doing the addition and subtraction before doing the division when solving an equation.