Khan Academy
Khan Academy: Algebra: Conic Sections: Introduction to Conic Sections
A video lesson introducing conic sections. Includes a sketch of each of the four fundamental conic sections in two dimensions. Also explains why they are called conic sections by illustrating how each is the intersection of a cone and a...
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Equivalent Fractions Example
This video shows an example of writing equivalent fractions in the context of a word problem. Practice problems are available. [5:50]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Multiplying Whole Numbers
Two-digit by two-digit multiplication demonstrated through example in this short video. Practice problems are available. [3:18]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Comparing Fractions 2
This video shows how to compare two fractions using a several methods. Practice problems are available. [7:08]
Khan Academy
Khan Academy: Algebra: Graphing Inequalities 1
This video demonstrates how to determine if a set of ordered pairs is a solution to a two variable inequality. First the video shows how to plug the ordered pair into the inequality and solve, then the video demonstrates how to graph the...
Khan Academy
Khan Academy: Algebra: Rational Inequalities 2
A step-by-step breakdown on how to solve a rational inequality. [13:15]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Rounding Whole Numbers 3
This video shows how to round a 4-digit number to the nearest ten. Practice problems are available. [1:04]
Khan Academy
Khan Academy: Geometry: Three Points Defining a Circle
Demonstates that any three non-collinear points can be used to define a unique triangle with a unique circumcenter and circumradius. These, in turn, define a unique circle. The center of the circle is the circumcenter of the triangle....
Khan Academy
Khan Academy: Algebra: Conic Sections: Three Points Defining a Circle
A video lesson that describes how any three non-collinear points actually define a circle. First it is shown that three points define a triangle. Then it is shown that the circumcenter of that triangle is actually the center of the...
Khan Academy
Khan Academy: Algebra: X and Y Intercepts 2
This video demonstrates how to find the x and y intercepts given a linear equation. Once the intercepts are found it also shows how to graph the line on a coordinate plane. Practice problems available. [3:25]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Adding and Subtracting Fractions
This video shows how to add and subtract fractions with like and unlike denominators. Practice problems are available. [9:49]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Understanding Exponents 2
This video explains how to find the value of a number written in exponential notation. Practice problems are available. [1:15]
Khan Academy
Khan Academy: Algebra: Scientific Notation I
Video explaining scientific notation and negative exponents and then writing an example of a very small number in scientific notation. [4:12]
Khan Academy
Khan Academy: Linear Algebra: Matrix Vector Products
Video starts with reviewing matrix notation. Defines multiplying a matrix by a vector and shows examples. Shows how the matrix-vector products can be interpreted as the dot product of column vectors with a matrix or as a weighted linear...
Khan Academy
Khan Academy: Algebra: Dividing Polynomials 1
Video demonstrates how to divide a trinomial by a binomial. [3:20]
Khan Academy
Khan Academy: Geometry: Measuring Angles in Degrees
Explains how to measure an angle in degrees using a protractor. Defines acute, right, and obtuse angles. Practice problems available. [8:22]
Khan Academy
Khan Academy: Algebra: Linear Equations 4
This video demonstrates how to solve linear equations in which the variable "x" is in the denominator. There are three different sample problems presented. Practice problems available. [7:39]
Khan Academy
Khan Academy: Algebra: Graphing Exponential Functions
Video showing how to graph an exponential function by evaluating the function for chosen values of x and plotting the resulting points. [5:32]
Khan Academy
Khan Academy: Geometry: Figuring Out All Angles for Congruent Triangles Example
Explains how to use given triangle congruency statements to determine the unknown measures of all angles in a diagram where one large triangle is divided into three congruent triangles. [4:35]
Khan Academy
Khan Academy: Algebra: Adding and Subtracting Polynomials 1
Demonstrates how to add polynomials. Each polynomial is a trinomial. Practice problems available. [2:01]
Khan Academy
Khan Academy: Algebra: Variables and Expressions 1
This video demonstrates how to solve a word problem using an expression and substituting values for a variable. [2:00]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Basic Subtraction
This video covers a short review of addition, followed by basic subtraction concepts. Practice problems are available. [8:32]
Khan Academy
Khan Academy: Algebra: Exponent Properties Involving Quotients
Video explains and uses the quotient of powers rule as well as working with algebraic expressions with negative exponents. Video is also included in the Algebra: ck12.org strand. [9:22]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Decimal Place Value 2
This video shows how to write a decimal in word form, using place value concepts. Practice problems are available. [3:31]