Here's a quick look at percentages as proportions. Percentages really are looking at numbers as a part of a whole, so it makes sense to look at it as a proportion. And how do you write proportion? You write proportions like a fraction,...

What number is 40% of 30? Learn the formula and be able to figure out all of the percent problems. The instructor demonstrates the basic formula. Then she shows how and where to plug in the numbers according to what the problem is asking...

First, identify the parts of the word problem. Next, identify the variable, decide what formula to use, figure out the quantities, insert the quantities into the equation, and now solve. There are many parts to solving this word problem...

Learners who view this video will gain a stronger understanding of percent of change. This tutorial provides a formula and a sample problem. As the tutor completes the example, she explains and clarifies each step that she takes to find...

I=prt is the formula for interest. What does each variable represent? I =interest, p =amount originally invested, r =rate of interest (usually in percent), t =time. Now all you have to do is plug in the numbers and do the calculations.

Sales tax always increases the price of your purchases. How can you figure out how much you'll be paying in full? Teach your class how to figure out their total cost, including sales tax, with this video. Using an example of a pair of...

Inflation and higher fuel costs means airplane tickets will cost more to the consumer. So here is a word problem that presents a real-world situation. Figure out the total price for an airplane ticket that has increased by 30% from the...

The instructor goes through the steps of how to solve for the value of a variable in a two-step equation.

The teacher demonstrates how to use the subtraction property of equality, applying it to both sides of the equation to find the solution.

The teacher demonstrates how to use the addition property of equality, applying it to both sides of the equation to find the solution.

Two equations, two unknown variables. Use the substitution method to solve for one of the variables. Then plug that value into one of the equations to solve for the other variable. Finally plug both values into one of the original...

Two equations. What's the solution to this system? How can you solve it? Can you write the two equations in slope-intercept form? Yes, you can. Now graph each equation. Look, the lines are parallel. What does that mean? That means there...

Goodness! There are a lot of steps in getting to the final solution in this word problem. Watch this video and follow along as the instructor explains each and every step. There's a scatter plot, a line of fit, writing an equation based...

Given a table of values, find the rate of change. First, set up the given table, and identify the values that will be used to calculate the change. Of course, there is a formula. So use the formula to solve the problem. Still confused?...

Given a linear equation, rewrite it in different forms. No matter what form a linear equation is given in, it can be converted to the other forms. So that means every linear equation can be written in standard form, point-slope form and...

What makes an expression an inequality? Well, it would be considered an inequality if the expression has a greater than symbol, a less than symbol, a greater than or equal to symbol, or a less than or equal to symbol. This would mean...

Check to see if a given ordered pair is a solution to an inequality. Just plug the given values into the given inequality and do the math. If the resulting statement is true then the given ordered pair is a solution. If the statement is...

As part of a series on numbers less than 10,000, a thorough presentation demonstrates how to visualize numbers in groups of a thousand. The instructor then describes how to read and write numbers less than 10,000.

Using a step-by-step approach, Sal from Kahn Academy provides a visual description of what a group of 10, 100, and 1,000 means. It explores the value of numbers less than 10,000. The example is easy to understand. He puts marbles in a...

Use the Singapore math methods to work through simple problems. The visual representation of word problems allows viewers to start to make predictions and estimate the answers. A good way for class members to use a variety of methods to...

A rectangle, a rhombus, a square, a trapezoid, and a parallelogram, are these quadrilaterals? What are the criteria that make and shape a quadrilateral? It has something to do with parallel sides, congruent sides, and congruent angles....

Is it possible to take an equilateral triangle and cut it in half to make a 30-60-90 special triangle to make it easier to solve a problem? Why yes, of course! It's even possible to find the missing length without using the Pythagorean...

The video quickly reviews the definition of scientific notation, and then demonstrates how to multiply two numbers in scientific notation together and how to rewrite the final answer if necessary. It does not show an example...

Introduce learners to the discriminant. The discriminant, used to find the number of real solutions to a quadratic equation, is part of the quadratic formula. The video shows where in the formula you can find it, and provides an example...