This QuickTime movie provides an opportunity to practice solving Wordsworth Puzzles using Algebra. As you watch and listen to the teacher and student interact it helps clarify the thinking behind applying this concept.

Learn how to solve equations in one step by multiplying or dividing a number from both sides. These problems involve decimals and fractions. [7:51]

Sal solves the following age word problem: William is 4 times as old as Ben. 12 years ago, William was 7 times as old as Ben. How old is Ben now?

Sal solves the following age word problem: In 40 years, Imran will be 11 times as old as he is right now. How old is he right now?

It's Picture Day at Odd Squad, and Otto needs to use an equation to calculate how long he needs to wait in line.

Sal Khan works through a question on algebraic properties from the Praxis Core Math test. [5:45]

This lesson will demonstrate how to recognize when an equation has infinitely many solutions. It is 6 of 6 in the series titled "Equations that have Infinitely Many Solutions."

This lesson will demonstrate how to recognize when an equation has no solution. It is 7 of 7 in the series titled "Equations that have No Solution."

This lesson defines the phrase equivalent equations. It is 3 of 5 in the series titled "Equivalent Equations."

This lesson defines the phrase equivalent equations. It is 4 of 5 in the series titled "Equivalent Equations."

In this lesson, the concept covered is that of solving for one or more than one variable in an equation. It is 4 of 9 in the series titled "Multiple Variable Equations."

In this lesson, the concept covered is that of solving for one or more than one variable in an equation. It is 5 of 9 in the series titled "Multiple Variable Equations."

In this lesson, the concept covered is that of solving for one or more than one variable in an equation. It is 6 of 9 in the series titled "Multiple Variable Equations."

In this lesson, the concept covered is that of solving for one or more than one variable in an equation. It is 7 of 9 in the series titled "Multiple Variable Equations."

In this lesson, the concept covered is that of solving for one or more than one variable in an equation. It is 8 of 9 in the series titled "Multiple Variable Equations."

In this lesson, the concept covered is that of solving for one or more than one variable in an equation. It is 1 of 9 in the series titled "Multiple Variable Equations."

This lesson shows how to identify common factors in an equation and factor them out to make solving simpler. It is 10 of 13 in the series titled "Simple Factoring."

This lesson shows how to identify common factors in an equation and factor them out to make solving simpler. It is 4 of 13 in the series titled "Simple Factoring."

This lesson demonstrates how to use the correct format to find the value of a variable in an addition problem. It is 12 of 17 in the series titled "Solving Addition Equations."

This lesson demonstrates how to use the correct format to find the value of a variable in an addition problem. It is 3 of 17 in the series titled "Solving Addition Equations."

This lesson demonstrates how to use the correct format to find the value of a variable in an addition problem. It is 7 of 17 in the series titled "Solving Addition Equations."

This lesson will demonstrate how to recognize when an equation has infinitely many solutions. It is 3 of 6 in the series titled "Equations that have Infinitely Many Solutions."

In this lesson, the concept covered is that of solving for one or more than one variable in an equation. It is 3 of 9 in the series titled "Multiple Variable Equations."

This lesson demonstrates how to use the correct format to find the value of a variable in an addition problem. It is 14 of 17 in the series titled "Solving Addition Equations."