Curated OER
How Do You Subtract Fractions with Different Denominators?
Combining fractions with unlike denominators. Wait! You can't do that! You have to have common denominators to combine the numerator of fractions. Here's a quick review of changing the denominator by multiplying each fraction by that...
Virtual Nerd
How Do You Subtract a Negative Number from a Positive Number?
Subtracting an integer is as simple as adding the opposite value. Watch this video to see an example of how to change the signs and then add the two integers. Use this as a review after you have taught this valuable skill to your middle...
Curated OER
How Do You Subtract Fractions with Variables?
Combining terms that have fraction coefficients means you have to use your prior knowledge of adding and subtracting fractions. Find the least common denominator so you can combine the fractions. Finally put it all back together.
Scholastic
Study Jams! Addition & Subtraction Equations
Zoe is decorating a cake for her grandpa's birthday and needs to know how many more candles to add. Follow along as she explains how to set up and solve algebraic equations in this step-by-step presentation. Equations with negative...
Math Antics
Working with Parts
Get a clearer picture of working with fractions. While continuing to work with fractions as parts, the video shows how to use drawing to compare and add fractions. Worksheets then provide opportunities for pupils to practice comparing,...
Math Antics
Common Denominator ECD
Find the easiest common denominator. A video demonstrates finding a common denominator to add fractions. Pupils learn how to find a common denominator by using the product of the two denominators. After finding the common denominator,...
Khan Academy
Inequalities Using Addition and Subtraction, Linear Inequalities, Algebra I
Beginning with a "handful of fairly simple inequality videos," Sal demonstrates a few inequality problems in which mathematicians must add or subtract. Though he states that his goal is to familiarize viewers with the notation, his...
Khan Academy
How to Add Fractions that have Different Denominators, Fractions, Pre-Algebra
Your young mathematicians can solve this problem along with Sal. They will add 4/9 and 11/12 by finding a number that evenly divides both 9 and 12. Sal fully explains the process of finding a common denominator in an evident and...
Curated OER
How Do You Rewrite Subtraction as Addition?
A look at how to write a subtraction problem as an addition problem. The first value stays the same and the second value becomes the opposite value which is added to the first.
Curated OER
What's the Subtraction Property of Equality?
A quick definition of the subtraction property of equality, this video could be used to introduce your class to the concept. Complement your lesson, or send learners home with the link to the video for further study.
Khan Academy
ROA Discussion 1, Stocks and Bonds, Finance and Capital Markets
Introduce young economists to the concept of return on assets with this clip, which begins with an overview of various theories on calculating ROA. Sal writes out four formulas and explains why he uses the last one: EBIT divided by...
Khan Academy
Multi-Step Inequalities, Linear Inequalities, Algebra I
Complete an algebra lesson with this video on evaluating and solving multi-step inequalities. Sal Khan completes several practice problems, explaining his process while exemplifying strong teaching skills. Each problem is different and...
Khan Academy
SAT Prep: Test 7 Section 5 Part 1
The beginning of a new set of SAT practice problems from The Official SAT Study Guide involves sequences, distribution, combinations, and geometric figures. Sal makes sure to provide thorough explanations to each problem, while...
Curated OER
What are Equivalent Fractions?
Check this out! Make equivalent fractions by multiplying or dividing a given value. It's a useful skill to have in math. Watch this video as the instructor demonstrates several ways to get equivalent fractions.
Math Antics
Common Denominator LCD
Do not use the easiest but the first. The video shows a method to find a common denominator by finding the least common denominator to add fractions. By listing the multiples of the denominators, learners easily identify the least common...
Curated OER
How Do You Add Fractions with the Same Denominator?
Want to add fractions? Well, if they have the same denominator it's going to be so easy. Just add the numerator values together and keep the denominator the same. Easy as that.
Curated OER
How Do You Add a Negative Number to a Positive Number?
Add a negative number with a positive number. How? Follow along and see the instructor explain what to do.
Curated OER
How Do You Rewrite Subtraction as Addition?
A quick look at how to write a subtraction as an addition problem. The first value stays the same and the second value becomes the opposite value which is added to the first.
Curated OER
How Do You Add a Negative Number to a Positive Number?
Combine a negative number with a positive number. How? Follow along and see the instructor explain what to do.
Curated OER
How Do You Add Fractions with Different Denominators?
You've got three fractions to add together. Wait! They have unlike denominators. So the first thing you have to do is find the least common denominator. Now multiply the terms so they all have the same denominator. Don't forget to...
Curated OER
How Do You Add Fractions with Variables?
Combine fractions that have unlike denominators and a variable. As usual the variable needs to get isolated. Then find the least common denominator so you can combine the fractions. Finally put it all back together.
Curated OER
How Do You Add Fractions with Different Denominators?
You've got three fractions to add together. Wait! They have unlike denominators. So the first thing you have to do is find the least common denominator. Now multiply the terms so they all have the same denominator. Don't forget to...
Curated OER
How Do You Find a Common Denominator and a Least Common Denominator?
Finding a common denominator is as easy as multiplying all the denominators together. But often, the resulting number is quite large and that's not fun. So try to find the least common denominator. How? Factoring! Check out this video...
Khan Academy
Khan Academy: Algebra: Adding and Subtracting Rational Expressions Example 2
Video shows example of adding and subtracting rational expressions. Includes discussion of using the least common multiple of the denominators for a common denominator. [2:56]