First, what is LCD?
Least Common Denominator ~> It is the smallest common factor of the denominator.
[!] We use the LCD to make fraction operations easier.
For example, I have 1/4 and 3/5. Let's try to make the denominators the same by using the Least Common Multiply method:
Our LCM is 20, which will also be our denominator.
Important: What you do to the bottom of the fraction, must also be done to the top.
This is our LCD:
> A useful link that talks about LCMs and LCDs (also provides practice exercises).
> Find about Adding Fractions: Nicole's Scribe.
> Comments are appreciated, thank you.