Since the angles in an equiangular polygon are equal, the measure of one angle in any equiangular or regular polygon is simply the sum of polygon angles divided by the number of angles in the polygon. This video explains how knowing this information allows us to solve polygon problems with missing angle measurements. (2:09)
This video explains how a midsegment of a trapezoid is the line segment connecting the midpoints of the two non-parallel sides of a trapezoid. A trapezoid midsegment is parallel to the set of parallel lines in a trapezoid and is equal to the average of the lengths of the bases. A trapezoid midsegment is related to a triangle midsegment given that both of their lengths are proportional to the bases. (2:51)
Changing Decimals to Percents (sv)
How to convert decimals to percentages.This video by Duane Habecker is part of the video collection at NextVista.org (http://nextvista.org), a proud partner of Curriki.
Converting Between Decimals and Percents
Instructor uses a white board to demonstrate how to write percents as decimals and decimals as percents. For example, to write 82% as a decimal, think of 82% as 82/100, and remember that dividing by 100 moves the decimal point two places to the left, to get 0.82. So 82% can be written as the decimal 0.82. Since a percent can be written as a decimal by moving the decimal point two places to the left, a decimal can be written as a percent by moving the decimal point two places to the right. For ex
How to Write a Decimal as a Percent
In this video learn how to write a decimal as a percent by multiplying the number by 100 and moving the decimal point two places to the right. A math tutor calculates percentages from fractions and decimals on a chalkboard.
Dividing Mixed Numbers
The instructor uses an electronic chalkboard to demonstrate how to divide mixed numbers. One example is modeled using a step by step approach.
Mrs. Burk Perimeter Rap
Mrs. Burks sings a rap song explaining how to find the perimeter. Catchy tune for students to remember (Running Time 0:59).
How to Read a Protractor
The instructor uses a protractor, pen, and paper to demonstrate how to use a protractor to measure angles.
Solving Linear Systems of Equations Using Substitution
Solving Linear Systems of Equations Using Substitution - 3 complete examples are shown.
Systems of Equations
Systems of equations. This video starts off with a black screen because the narrator uses it as a 'chalkboard'. This video is appropriate for older middle and high school students.
Solving Systems by Substitution - Math Help
The instructor uses a white board for demonstration and this video is suitable for high school students. Students learn to solve a system of linear equations by substitution, by first isolating one of the variables in the system, then substituting its value for the corresponding variable in the other equation.
Solving Systems by Graphing - Algebra Help
The instructor uses a white board for demonstration and this video is suitable for high school students. Students learn to solve a system of linear equations by graphing. The first step is to graph each of the given equations, then find the point of intersection of the two lines, which is the solution to the system of equations. If the two lines are parallel, then the solution to the system is the null set. If the two given equations represent the same line, then the solution to the system is th
Solving Systems of Equations by Addition and Subtraction
This video discusses solving systems of equations through addition and subtraction. Various examples are shown and the narrator solves the problems using a smart board. The problem examples appear a bit faint and small but are clear and dark when being solved with a marker.
Solving Systems of Equations by Substitution
This lesson is for ntermediate Algebra Level. In the lesson, Professor Burger shows how to solve systems of equations using a technique known as substitution. In this approach, students solve one equation for one of the variables (eg y) and then plug the value (what y is equal to) into into the other equation (anywhere a y appears). This substitution will allow you to solve for x and then in turn solve for y. Professor Burger walks the viewer through several different types of
Understanding What Algebraic Variables Look Like and What They Mean
In algebra, variables are placeholder letters (capitalized and
lowercase) that represent the unknown, or what you're solving for. This video shows you what variables can look like and what they mean. Understanding variables help make algebra easier.
Algebra Applicatons: Variables and Equations Using TI_Nspire Graphing Calculator
In this episode of two real-world explorations are developed. Simulations of a river are used to bring real-world, relevant applications of algebra to students. The episode also
integrates technology through the use of the Texas Instruments
TI-Nspire graphing calculator. All keystrokes on the calculator are clearly shown. Dynamic river footage and animations bring the variables and equations in algebra math concepts to life.
Cashill Variables in Algebra (A1-1.1)
Evaluating algebraic expressions using variables. Definitions of variable, variable expression, and what evaluate a variable expression means are reviewed. Students are given problems to solve and then the answers are shown. this is a PowerPoint video with no sound.
How to Multiply Monomials
In algebra, two-X is one term because the two and the X are being
multiplied by each other. In this video a math teacher explains how to multiply the coefficients and the variables when multiplying monomials with examples on a whiteboard. Narrators speech is shown on bottom of screen.
This is a brief explanation/overview of functions in Calculus. The video explains what critical points are in a function.
Calculus - Introduction to Limits
In his easy, conversational tone, Mr. Khan offers an introduction to the intuition behind limits. Mr. Khan uses the Paint Program (with different colors) to illustrate his points. Sal Khan is the recipient of the 2009 Microsoft Tech Award in Education. (07:37)