Fastest Way to find the L.C.M.! Useful for Adding or Subtracting Fractions With Unlike Denominators.

Many students have difficulty finding the least common denominator to add or subtract fractions with different or unlike denominators. This video shows an amazingly simple and fast method to find the Least Common Multiple of 2 numbers. You can use the LCM to make the unlike denominators of fractions the same first before adding or subtracting the fractions. This video is simple and intuitive.
Do you know that the Least Common Multiple (LCM) is the basis for making unlike denominators the same before adding or subtracting fractions with different denominators? Learn how to use LCM to make unlike denominators the same in this easy and intuitive video. Don’t take shortcuts without understanding.
Don’t use the Butterfly trick to add 2 fractions with different denominators without understanding why it works in some cases. In other cases, the Butterfly trick involves more work.
Welcome to this series of videos on the Addition, Subtraction, Multiplication and Division of Fractions. Much thought has been given to make each video simple and intuitive to understand. The basic concepts required to add, subtract, multiply and divide fractions are clearly explained and illustrated. It is important to get the basics right from the start.
Many online videos show the use of the Butterfly Method to add or subtract a pair of fractions with unlike denominators. The underlying principle for its use is usually not adequately explained in most of these videos keen to show the short-cut 'trick' as a hack. In some cases, the Butterfly Method is NOT the most efficient method to add or subtract fractions with unlike denominators. Without understanding the constraints of the Butterfly Method, students may jump right into using the Butterfly Method without knowing that they would end up with more work in certain cases where an easier method is available.
Moreover, the Butterfly Method cannot be used to add or subtract 3 or more fractions. It cannot be used for the multiplication and division of fractions. Some students who memorised the Butterfly Method without the correct understanding have used it to multiply 2 fractions together, resulting in wrong answers.
You can watch my youtube video on why the Butterfly Method is NOT always the most efficient method in the link below:
Add Fractions with Unlike Denominators: What They Don't Teach You About the Butterfly Method
• Add Fractions with Unl...
You can also watch my video on Adding Fractions with Unlike Denominators Part 1 in the link below to see the introduction to adding 2 fractions with unlike denominators first.
• Add fractions with Unl...
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Don’t use the Butterfly Method as it does not always give you the Least Common Multiple!