Adding & Subtracting Fractions

You're probably surprised we got this far down the page before mentioning Least Common Denominator (LCD), eh? In this video we cover adding and subtracting fractions with different denominators using the LCD method (similar to least common multiple), or LCM. I also show you a great trick for coming up with a common denominator when you're having trouble thinking of a number that both denominators go into. 7.NS.1, 7.NS.2, 7.NS.3