Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Finding Unit Prices
This video shows how to find a unit price in the context of a word problem and write it in simplest form. Practice problems are available. [2:01]
Khan Academy
Khan Academy: Statistics: Calculating R Squared
Video shows using a spreadsheet to demonstrate calculating the coefficient of determination or r-squared. Also explains how to interpret the value of r-squared. [9:45]
Khan Academy
Khan Academy: Algebra: Absolute Value and Number Lines
A review of what an absolute value is and a step-by-step demonstration on how to plot absolute values on a number line. Practice problems available. [5:39]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Level 4 Division
This video teaches division of two-digit numbers into multi-digit numbers using long division. Practice problems are available. [9:35]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: The Distributive Property
This video shows how to rewrite an expression using the distributive law of multiplication. Practice problems are available. [4:56]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Converting Fractions to Decimals
This video shows how to convert from a fraction to a decimal and from a decimal to a fraction. Practice problems are available. [9:23]
Khan Academy
Khan Academy: Trigonometry: Basic Trigonometry Ii
Continuation of video lesson introducing the basic trigonometric ratios. Examples of finding sine, cosine and tangent for two different right triangles, including finding side lengths by the Pythagorean Theorem and rationalizing the...
Khan Academy
Khan Academy: Statistics: Introduction to the Normal Distribution
Video discusses the importance of the normal distribution and gives its formula with examples of how it is used. Connects to the central limit theorem. Manipulates the normal distribution formula to show different forms of it. Uses Excel...
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Negative Numbers Introduction
This video shows how to think about and represent negative numbers using a number line. Practice problems are available. [9:36]
Khan Academy
Khan Academy: Statistics: More Empirical Rule and Z Score Practice
Video example of calculating z-scores and explaining how z-scores apply to non-normal distributions. Also shows example of using empirical rule to calculate probability. Includes link to practice problems. [5:57]
Khan Academy
Khan Academy: Algebra: Introduction to the Quadratic Equation
Explains how to solve quadratic equations, or find the roots of the equation, by factoring and by using the quadratic formula. Three different equations are solved. [9:14]
Khan Academy
Khan Academy: Algebra: Consistent and Inconsistent Systems
This video demonstrates what it means to be a consistent or inconsistent system of equations and how to determine if a given system is consistent or not. [5:28]
Khan Academy
Khan Academy: Algebra: Connection Between Even and Odd Numbers and Functions
Video describing why even and odd functions may have been given their names based on the whether the exponent of a function is an even or odd number. Includes link to additional practice at the top of the video. [4:08]
Khan Academy
Khan Academy: Trigonometry: Basic Trigonometry
Video introducing the basic trigonometry ratios sine, cosine, and tangent. Examples are shown for the two acute angles of a right triangle. Includes link to additional practice problems. [9:17]
Khan Academy
Khan Academy: Algebra: Slope Example
This video demonstrates how to calculate the slope when given data in the form of dependent and independent variables. It also shows how to interpret what the slope means in an application problem. Practice problems available. [4:03]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Ratios as Fractions in Simplest Form
This video shows how to write a ratio as a fraction in simplest form. Practice problems are available. [1:19]