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Investment and real interest rates | Macroeconomics | Khan Academy
Intuition as to why high real interest rates lead to low investment and why low rates lead to high investment Watch the next lesson:...
Khan Academy
Monetary and fiscal policy | Aggregate demand and aggregate supply | Macroeconomics | Khan Academy
Basic mechanics of monetary and fiscal policy Watch the next lesson:...
Khan Academy
Money supply: M0, M1, and M2 | The monetary system | Macroeconomics | Khan Academy
In this video, learn about the two measures of money that are part of the money supply - M1 and M2 - as well as the monetary base (which is sometimes called M0). Watch the next lesson:...
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Electoral College
The United States Electoral College can be a confusing concept for young learners at first glance; however, this instructional video will help clear up that confusion with a clear explanation of how electors are allocated and the...
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Deficit and Debt Ceiling
Leave your class with a clear understanding of the difference between the federal deficit and debt, the effects of raising the debt ceiling in order to fund borrowing costs, and the risks of defaulting on governmental obligations, such...
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Tea, Taxes, and the American Revolution
Rather than simply summarizing the events that led to the American Revolution, have your learners listen as John Green offers some interesting points to be used as discussion or writing prompts in your review of the war. Green details...
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More While Loops: Balloon Hopper
Starting with an empty computer screen for a coder can be as intimidating as a bare canvas to a painter or a blank sheet of paper to a writer. Where do you start? If you know what you are trying to build, then you just pick something and...
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More on Variables
Variables represent one of the most fundamental features in any programming language. The easy-to-follow explanation given in this video focuses on the difference between variables and values. Specifically, the author looks at how...
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Adding Rational Expressions Example 1
At just under four minutes, this video is a great way to reinforce your lecture on adding rational expressions. Add it to a review session before a unit test, or assign it for homework in your algebra class.
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The Pythagorean Theorem Intro
This video, the first in a series on the Pythagorean theorem, introduces the formula for discovering the measurement of a side of a right triangle. The material is introduced and explained in a straightforward and easy-to-understand...
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Solving for F in Terms of C, Linear Equations, Algebra I
The instructor uses the temperature formula to illustrate how the variables can be manipulated to solve a problem.
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Solving Equations with the Distributive Property, Linear Equations, Algebra I
Here is an equation in which the first step is to use the distributive property to remove the parenthesis. Then, it is solved for the variables. Since there are variables on both sides of the equation, it is important to verify the...
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Example 2: Variables on Both Sides
Sal offers an example showing how to manipulate numbers on either side of the equal sign to isolate the variable and solve the equation.
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Two-Step Inequality Example
Solving single variable inequalities is explored in this video. The example that Sal shows here contains fractions, shows the need to reverse the inequality because he multiples by a negative number during his computation, and shows the...
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Scale of the Large, Scale of the Universe, Cosmology & Astronomy
Sal makes a relatable comparison for pupils to understand the universe's relative size. The progression from a man's size to a galaxy's size is explained in terms of each object relative to the next. The multiple objects we can process...
Khan Academy
Singapore Math: Grade 3a Unit 2 (part 5)
What a great way to present multiple-digit addition! Sal adds the numbers 2803 and 1443. He draws a chart representing each of the four place values from the problem and then draws "place value buckets” to represent what each number...
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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...
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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...
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Parallel Lines From Equation, Mathematics I, High School Math
Here is a fairly basic video that uses three equations, each written in slope-intercept form, to determine whether the lines are parallel. Sal graphs each equation on the same coordinate plane to show how their slopes compare. The video...
Khan Academy
SAT Prep: Test 2 Section 6 Part 5
Addressing problems 15-16 on the practice SAT, Sal draws the diagram necessary for solving the geometry problem in number 15. After solving for the area of the triangle, he goes on to the quadratic equation in number 16, taking care to...
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Parametric Equations 4, Parametric Equations and Polar Coordinates, Precalculus
In a follow-up to the problem presented in the last video, Sal considers whether other parametric equations move along the same path as the last equations. He shows that taking a multiple of time changes the speed of the position along...
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Multiplying and Dividing Rational Expressions 1, Algebra II
Provide your algebra class with some review of rational expressions in this video. Sal uses several sample problems to show viewers the process, and his explanations are clear and easy to understand.
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Introduction to Complex Numbers, Imaginary and Complex Numbers, Precalculus
This video continues looking at dividing complex numbers by looking at the conjugate of a complex number. The instructor then uses the conjugate to rationalize the denominator of a rational expression with a complex number in the...
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Triangle Medians and Centroids, Special Properties and Parts of Triangles, Geometry
This video discusses the terminology used in geometry, including words like centroid and median. Through this lecture, young mathematicians can see a visual representation of both median and centroid. Also, a proof showing how to...